Calculate resin for every pour, with confidence.

The amount of pigment to add to epoxy resin depends on the pigment type, the resin quantity, and the maker's stated mixing limit. Start with the pigment maker's recommended rate, calculate the amount for your batch, and adjust only within the product instructions.

The pigment calculator can help work out an amount from your resin batch and chosen pigment rate. If the product label gives a maximum pigment percentage, use that limit rather than guessing from color strength.

How much pigment should you add to epoxy resin?

There is no single pigment percentage that suits every epoxy resin and colorant. Liquid colorants, pigment pastes, and dry powders have different compositions, so a rate that works for one product may not suit another.

Check the instructions for both the resin and the pigment. Look for the permitted pigment type, the recommended amount, and whether the rate is measured by weight or volume. If the instructions do not state a usable rate, contact the maker instead of treating an example percentage as a product recommendation.

For calculations, a pigment rate is often written as a percentage of the resin amount. A rate of 2% by weight means 2 g of pigment for every 100 g of resin. It does not mean 2% of the combined resin, hardener, and pigment weight.

That distinction matters because resin systems use different mixing ratios. Unless the pigment instructions say otherwise, calculate the pigment against the base specified by the pigment maker, not an assumed total batch weight.

How do you calculate pigment by weight?

When the instructions give a weight percentage, multiply the stated resin weight by the pigment percentage written as a decimal. A percentage is a part out of 100, so 1% becomes 0.01 and 2% becomes 0.02.

Use this formula:

Pigment weight = resin weight × pigment rate ÷ 100

For an example, assume the pigment instructions permit a rate of 2% by weight, and your example batch contains 250 g of resin. The calculation is:

250 g × 2 ÷ 100 = 5 g of pigment.

The example requires 5 g of pigment at the assumed 2% rate. This is a worked calculation, not a recommended rate for every pigment or resin.

Check the result another way. If 1% of 250 g is 2.5 g, then 2% is twice that amount, or 5 g. Both methods give the same answer.

The table shows how the calculation changes with different example batch weights. It assumes the same example rate of 2% by weight for every row.

Do not copy the example rate onto your product without checking its instructions. Some pigments are concentrated, while others contain carriers or fillers that change how much is needed.

Can you calculate pigment by volume?

Only use a volume calculation when the pigment instructions give a volume-based rate. If the rate is stated as milliliters per 100 mL of resin, keep both quantities in milliliters. Do not treat grams and milliliters as equal.

For an example, assume a pigment label permits 3 mL per 100 mL of resin. For an example resin volume of 400 mL, the calculation is:

400 mL × 3 mL ÷ 100 mL = 12 mL of pigment.

The units simplify to milliliters, leaving 12 mL of pigment for the example batch. You can check it by dividing 400 mL into four groups of 100 mL. Each group needs 3 mL, so 4 × 3 mL = 12 mL.

Do not convert a weight percentage into a volume amount without knowing the pigment's density. Density means the mass in a given volume. A spoonful of one pigment may weigh more than the same volume of another.

How do you use the pigment calculator?

The calculator can help with the arithmetic once you know the correct rate for your pigment. Treat its result as a calculation based on your inputs, not proof that the rate is suitable for your resin system.

1. Open the pigment calculator.
2. Enter the resin amount for your batch using the unit shown by the calculator.
3. Choose the measurement basis that matches the pigment instructions, such as weight or volume, if the calculator provides that option.
4. Enter the permitted pigment rate from the product instructions.
5. Calculate the result and check that its unit matches the way you will measure the pigment.
6. Compare the result with the product's stated maximum before adding anything to the batch.

If the calculator does not support the unit or rate shown on your product, use the formula by hand instead. Do not enter a weight rate into a volume field or assume the calculator knows the pigment's density.

What mistakes waste pigment or spoil a batch?

Errors can lead to wasted colorant or a batch that does not behave as expected. The figures below are examples showing the amount affected by a calculation mistake, not estimates of product performance.

One common error is confusing the percentage number with a decimal. Multiplying 250 g by 2 instead of dividing by 100 gives 500 g, not the correct example amount of 5 g. That result is 100 times the amount calculated at 2%.

Another error is calculating pigment from the combined resin and hardener weight when the label defines the rate against resin alone. For example, if the resin weighs 250 g and the hardener weighs 125 g, the combined weight is 375 g. At an example rate of 2%, using the combined amount gives 7.5 g instead of 5 g, a difference of 2.5 g.

Too much pigment can also change the mixture's properties, depending on the formulation. Too little may produce a lighter color than intended. Follow the resin and pigment makers' instructions rather than trying to fix color by adding an unknown amount.

Record the batch weight, rate, and pigment amount when repeating a color. Keep the same pigment product and measurement basis; equal-looking spoonfuls do not guarantee equal pigment weights.

When is the pigment estimate unreliable?

The calculation is only as reliable as the input rate and the amount measured. It cannot predict the final shade from a percentage alone. Pigment concentration, resin clarity, layer thickness, background color, and lighting can all affect how the finished color looks.

A rate that works in a thin coating may not look the same in a deep casting. Some pigments also settle or disperse differently, so a mathematically correct amount does not guarantee an even color. Use a small trial batch only if the product instructions allow it, and keep its resin-to-hardener ratio unchanged.

Do not use the same rate across liquid dyes, pigment pastes, mica powders, and other colorants unless their instructions support that use. Check the resin maker's instructions and the pigment's safety data sheet before mixing.

For weight-based calculations, a scale must be able to measure the required amount with enough resolution. If the calculated pigment amount is smaller than the scale can reliably show, a more suitable measuring method may be needed. Do not round a tiny amount up without checking the permitted rate.

Common questions about pigment amounts

Should pigment be measured before or after mixing resin and hardener?

Follow the resin and pigment instructions, because the permitted order can vary by product. If the pigment rate is based on resin weight, calculate it from the specified resin amount rather than assuming the total mixed weight is correct.

Can you add more pigment to make the color darker?

Only add pigment within the maker's stated limit. A darker shade may require a different pigment concentration or product, and adding more than the permitted amount can affect the mixture.

Does pigment percentage mean the same thing as resin-to-hardener ratio?

No. Pigment percentage describes the colorant amount relative to a stated base quantity. The resin-to-hardener ratio specifies how much of each component to combine, and you must follow that separate instruction.

For a weight rate, 1% means 1 g of pigment per 100 g of the specified base amount. For a volume rate, 1% means 1 mL per 100 mL only when the product defines the rate that way.

To calculate different mold shape volumes, measure the inside cavity and use the formula that matches its shape. For round, box, tapered, half-sphere, and regular hexagonal molds, the result estimates how much space the resin will fill.

The mold shape calculator can help with common cavity shapes. You still need accurate measurements and the correct shape selection. The hand calculations below also let you check whether a result makes sense.

How to calculate different mold shape volumes

Start by identifying the shape of the hollow space inside your mold. Then measure the inside dimensions to the level where you want the resin to stop. Outside measurements include the mold walls and can give you the wrong volume.

Volume measures how much space a cavity holds. For resin molds, the result is often shown in milliliters (mL) or US fluid ounces (US fl oz). If you measure in centimeters, a volume of one cubic centimeter (cm³) equals one milliliter.

Use the same unit for every dimension in a formula. For example, do not enter a radius in inches and a depth in centimeters. Convert the measurements before multiplying them.

Which formula matches each mold shape?

Use the formula that matches the shape and wall profile. The following formulas assume regular shapes with straight, even surfaces unless stated otherwise.

• Box or rectangular mold: Multiply inside length by inside width and inside depth. Formula: volume = length × width × depth.
• Cylinder: Multiply pi (π) by the radius squared and then by the height. Formula: volume = π × radius² × height. The radius is half the inside diameter.
• Round tapered mold: For a mold shaped like a cone with its tip removed, use volume = π × height ÷ 3 × (R² + R × r + r²). Here, R and r are the larger and smaller inside radii.
• Half sphere: Multiply two-thirds of pi by the radius cubed. Formula: volume = ⅔ × π × radius³. This assumes a true half-sphere cavity.
• Regular hexagonal mold: Multiply the area of its hexagonal base by its depth. Formula: volume = (3√3 ÷ 2) × side length² × depth. This assumes six equal sides and straight walls.

Do not treat every tapered cavity as a round tapered mold. A square or hexagonal cavity that narrows with depth needs a formula that matches its base and taper.

How do you calculate the volume by hand?

Use the following method when you want to check a calculator result or calculate a shape without a tool.

1. Place the mold on a level surface. Decide the resin fill line before taking measurements.
2. Measure the inside dimensions. Use the diameter for a round cavity, or the inside length, width, and depth for a box.
3. Convert every dimension to the same unit. For instance, 1 inch (2.54 cm) equals 2.54 centimeters.
4. Choose the matching formula and calculate the volume. If you use centimeters, the result is in cubic centimeters, which equal milliliters.
5. For identical molds, multiply the volume of one cavity by the number of molds you will fill.
6. Decide whether to add a handling allowance. The cavity volume does not account for resin left in the mixing cup or on the stir stick.

Consider this worked example using a cylindrical mold. The example inside diameter is 6 cm (2.36 in), and the example fill height is 2.5 cm (0.98 in).

First, divide the inside diameter by two to find the radius: 6 cm ÷ 2 = 3 cm (1.18 in).

Next, apply the cylinder formula: volume = π × radius² × height.

Volume = 3.1416 × 3 cm × 3 cm × 2.5 cm = 70.69 cm³.

The estimated cavity volume is about 70.7 mL (2.39 US fl oz). This is the amount that fills the example cavity to the measured line, before any extra allowance.

The table compares several example shapes. These dimensions are examples, not standard mold sizes. The estimates assume the shape matches its stated formula.

To verify a volume in milliliters as US fluid ounces, divide the milliliter amount by 29.5735. For the example cylinder, 70.7 mL ÷ 29.5735 is about 2.39 US fl oz. This conversion changes the unit, not the amount of space in the cavity.

For a batch of four identical cylindrical molds, the example total is 4 × 70.7 mL = 282.8 mL (9.56 US fl oz). If you choose an example handling allowance of 10%, the extra amount is 282.8 mL × 0.10 = 28.28 mL (0.96 US fl oz). The resulting planning quantity is about 311.1 mL (10.52 US fl oz). That percentage is an example, not a universal allowance.

How do you use the mold shape calculator?

The calculator supports cylinder, tapered, half-sphere, hexagon, and box shapes. Choose the closest match, then use the inputs to describe the inside cavity rather than its external size.

1. Open the mold shape calculator.
2. Select the mold shape that matches your cavity.
3. Measure and enter the inside dimensions requested for that shape. Keep the measurement unit consistent across all dimensions.
4. Enter how many matching molds you intend to fill, if you are calculating a batch.
5. Enter the resin density if you need the weight estimate, using the product data sheet for the appropriate value.
6. Review the volume for one mold, the total for the batch, and the amount that includes your selected allowance. Check the result units before measuring.

The calculator works from the dimensions and options entered. It cannot detect a measurement taken from the outside of a mold or know which fill line you intend to use. Compare the result with the hand formula when the cavity has a regular shape.

What mistakes lead to wasted resin?

Measurement errors can change the quantity quickly. The following table uses example calculations to show the difference that common mistakes can make.

Using the diameter as the radius is especially costly in the calculation. Doubling the radius makes the squared-radius term four times larger. In the example, that mistake adds 212.0 mL (7.17 US fl oz) to the estimate for one cavity.

Mixed units create another problem. If a formula uses centimeters for some dimensions and inches for others, the calculated result does not represent a valid volume. Convert first, then calculate.

Extra volume also uses more material than the cavity requires. To estimate its monetary cost, multiply the wasted volume by your actual material cost per milliliter or per US fluid ounce. Use your own purchase figures rather than assuming a fixed resin price.

Finally, cavity volume does not tell you how to combine resin and hardener. Follow the resin maker's specified mixing ratio and measurement method.

When do shape formulas become unreliable?

Formulas describe ideal shapes. A real mold may have rounded corners, sloped walls, a raised logo, deep lettering, or a curved base. These features change the space available for resin, so a formula can overestimate or underestimate the quantity.

A tapered formula also assumes a specific profile. The round tapered formula in this guide applies to a cavity whose circular cross-section changes evenly between its two ends. It is not the right formula for every mold that gets wider or narrower.

For an irregular cavity, a measured fill volume can provide a useful cross-check if the mold material permits the test liquid. Measure to the planned fill line, then dry the cavity completely before pouring resin. For handling and mixing, follow the resin maker's instructions and safety data sheet.

Rounding adds another limit. Keep extra digits during the calculation, especially when adding several small cavities. Round the final quantity to a practical measuring increment rather than rounding every intermediate result.

Common questions

Should I measure the inside or outside of a resin mold?

Measure the inside cavity because that is the space the resin must fill. Outside dimensions include the mold walls and can produce a larger estimate. Also measure to the intended fill line rather than assuming the cavity will be filled to its rim.

Does a mold volume calculation tell me the resin-to-hardener ratio?

No. The volume calculation estimates how much space the mold holds. The resin maker's instructions determine the mixing ratio and whether the components must be measured by volume or weight.

What formula should I use for a mold with rounded corners?

A box formula can give a rough estimate if the rounded parts are small, but it treats the corners as square. For a more detailed cavity, use a suitable fill-and-measure method if the mold material permits it, or use a capacity stated by the mold maker.

How do I calculate several different molds in one batch?

Calculate each cavity separately, using the formula that fits its shape. Add the individual volumes to find the total cavity volume, then decide whether a handling allowance is needed. Do not multiply one mold's volume by the batch count unless all the molds have matching dimensions and fill levels.

For volume conversion, 1 cm³ equals 1 mL, while 1 US fluid ounce is approximately 29.5735 mL. These conversions let you compare a calculated cavity volume with the markings on a measuring container.

To calculate how much leftover resin you can use, estimate the amount remaining, check the product's mixing ratio, and confirm that the material is still suitable for your project. Resin left in a container is not automatically usable, especially if it has already been mixed with hardener or started curing.

A leftover resin calculator can help estimate the quantity available for another project. The calculation works best when you know what remains, whether the components are mixed, and how much resin the next project needs.

What counts as usable leftover resin?

Leftover resin can mean two different things. Unmixed resin or hardener remains in its original container, while mixed resin contains both components and may already be curing.

Unmixed components may be suitable for future projects when they remain within the manufacturer's stated storage conditions and usable period. Check the label and product instructions before using them.

Mixed resin has a limited working period. This is the time during which the mixture remains workable before it thickens or begins to harden. Once it starts curing, do not assume it can be saved for another pour.

For example, an unused 100 ml (3.38 US fluid ounces) portion of unmixed resin is different from 100 ml (3.38 US fluid ounces) of resin and hardener already combined. The first may be available for a later batch, while the second may already be reacting.

Identify the material before calculating its usable amount. A volume estimate tells you how much is present, not whether it is still suitable for use.

How do you estimate the amount remaining?

The most useful method depends on how the resin is stored. If you can measure the remaining liquid directly, use that measurement. If the container makes direct measurement difficult, estimate the remainder from the amount originally purchased and the amount already used.

Use this formula:

Estimated amount remaining = original amount − amount used

For example, suppose a container originally held 250 ml (8.45 US fluid ounces) of resin. You estimate that 185 ml (6.26 US fluid ounces) has been used.

Amount remaining = 250 ml − 185 ml = 65 ml (2.20 US fluid ounces).

Check the result by adding the used and remaining amounts. In this example, 185 ml + 65 ml = 250 ml. The calculation balances with the original amount.

This method assumes you know how much was used and that there were no uncounted spills, transfers, or other losses. If some material remains stuck to the container or measuring tool, the actual usable quantity may be lower.

How much leftover resin does your next project need?

Compare the usable quantity with the amount required for the next project. For a project that needs a known volume, subtract its requirement from the estimated amount available.

Remaining after the project = usable amount − required amount

For example, assume you have an estimated 65 ml (2.20 US fluid ounces) available, and a small project needs 40 ml (1.35 US fluid ounces).

Amount remaining after the project = 65 ml − 40 ml = 25 ml (0.85 US fluid ounces).

The arithmetic shows that 25 ml remains. It does not guarantee that all of this amount can be transferred or used. Some material may be lost during measuring and pouring.

If the project requires separate resin and hardener quantities, calculate each component using the manufacturer's stated ratio. Do not treat the leftover volume as a complete batch unless its components are already in the correct proportions.

How do you calculate leftover resin using a calculator?

A calculator can help with the quantity arithmetic, but you still need to check the condition of the material and the requirements of the next project.

1. Identify whether the material is unmixed resin, unmixed hardener, or an already mixed batch.
2. Enter the original quantity if the calculator asks for the amount purchased or prepared.
3. Enter the quantity already used, or the amount you estimate remains, according to the available inputs.
4. Use matching units for the quantities being compared, such as milliliters or US fluid ounces.
5. Compare the estimated usable quantity with the amount required for the next project, if the calculator supports that calculation.

Check the calculator's available fields before relying on its result. A calculator that subtracts used volume may not account for spills, material left in containers, component ratios, or the condition of the resin.

Worked examples: how much can you use?

The following figures are examples, not product specifications or tested results. They show how to calculate remaining amounts and estimate material shortages.

In the shortage example, the project requires 90 ml (3.04 US fluid ounces), but only 65 ml (2.20 US fluid ounces) is available. The shortage is 90 ml − 65 ml = 25 ml (0.85 US fluid ounces).

In the combined-container example, the two quantities total 50 ml (1.69 US fluid ounces). This total is useful only if the materials can be combined according to the product instructions. Two different resin formulations should not be mixed together based on volume alone.

For a second check, compare the available and required amounts directly. In the shortage example, 65 ml + 25 ml = 90 ml, confirming the difference. In the combined-container example, 50 ml − 30 ml = 20 ml, confirming the sum.

What mistakes lead to wasted resin?

Incorrect estimates can leave you short during a pour or cause you to prepare more material than you need. The size of the loss depends on the quantities involved.

In the third example, 40 ml minus 3 ml equals 37 ml (1.25 US fluid ounces). This assumes the 3 ml loss is known and that no other material is lost.

Another mistake is assuming that the same volume always has the same weight. Volume measures space, while weight-based mixing requires mass measurements. If the product specifies a ratio by weight, use the appropriate mass measurements rather than converting by guesswork.

Finally, do not count partially cured resin as available material because it still looks liquid. Appearance alone cannot establish that a mixed batch remains suitable for a new pour.

When is the estimate unreliable?

The calculation becomes less reliable when the original amount or the quantity used is uncertain. Measurements from memory can omit small losses during transfers, spills, and cleanup. In those cases, report the result as an estimate rather than an exact usable quantity.

Container markings can also be too coarse for small amounts. If the remaining liquid sits below the smallest readable graduation, your measurement tool may not provide enough detail for a dependable estimate.

Mixed resin introduces another limit. Its working time and curing behavior depend on the particular product and conditions. A volume calculation cannot tell you whether a mixture has already begun to cure or whether it can still be used as intended.

Before reusing leftover material, follow the manufacturer's storage, mixing, and curing instructions. Consult the product instructions and safety data sheet for handling and disposal requirements.

For the most useful estimate, distinguish the amount physically present from the amount that can actually be transferred and used. The difference between those figures is the material lost to containers, tools, spills, or other process limits.

To mix small batches of resin under 50 ml (1.69 US fluid ounces), measure the resin and hardener using the mixing ratio stated by the manufacturer. Use measuring tools suited to the small quantities involved, because a small measuring error can change the proportions more than it would in a large batch.

When mixing small batches of resin, the main challenge is measuring each component correctly. The right method depends on whether the product specifies a ratio by volume or by weight, and whether your tools can measure the required amounts.

Why are small resin batches harder to measure?

A small batch leaves less room for measuring errors. If you miss 1 ml (0.034 US fluid ounces) in a 10 ml (0.34 US fluid ounces) measurement, the error represents 10% of that amount. The same 1 ml (0.034 US fluid ounces) difference in a 100 ml (3.38 US fluid ounces) measurement represents only 1%.

This matters when a resin system requires a specific proportion of resin and hardener. Hardener is the component mixed with the resin to start the curing process. Too much or too little of either component can prevent the mixture from curing as intended.

Small batches can also be harder to mix thoroughly. Material may remain on the sides or bottom of a mixing cup, especially when the batch barely covers the bottom. A mixing method that works for a large pour may leave unmixed material in a very small batch.

There is no single minimum batch size that works for every resin product. The manufacturer's stated ratio, measurement method, and minimum recommended quantity determine whether your intended batch is suitable.

Should you measure resin by volume or by weight?

Follow the ratio and measurement method specified for your resin system. A ratio by volume compares the space occupied by each component. A ratio by weight compares their masses, usually measured with a suitable scale.

These methods are not interchangeable. Resin and hardener can have different densities, meaning equal volumes may not have equal weights. Do not convert a volume ratio into a weight ratio without reliable product-specific information.

For volume measurements, use graduated syringes or other suitable measuring containers with markings that can resolve the amounts required. Check that their graduations are appropriate for your intended batch size.

For weight measurements, use a scale with enough resolution for the smallest component. Resolution means the smallest change the scale displays. A scale that shows only whole grams may be unsuitable when the required hardener quantity is a fraction of a gram.

For example, suppose a product calls for a 2:1 ratio by volume. This example ratio means two volume parts of resin for every one volume part of hardener. It does not mean two grams of resin for every one gram of hardener.

How do you calculate a batch under 50 ml?

First, decide the total mixed volume you want to prepare. Then divide that amount according to the specified ratio. The following worked example uses a hypothetical 2:1 volume ratio and a target batch of 30 ml (1.01 US fluid ounces).

The example assumes the total target volume is the sum of the two measured components. Actual final volume can differ slightly depending on the materials and measurement conditions.

Step 1: Add the ratio parts.

Resin parts + hardener parts = 2 + 1 = 3 total parts.

Step 2: Find the volume of one part.

One part = 30 ml (1.01 US fluid ounces) ÷ 3 = 10 ml (0.34 US fluid ounces).

Step 3: Calculate the resin quantity.

Resin = 2 × 10 ml = 20 ml (0.68 US fluid ounces).

Step 4: Calculate the hardener quantity.

Hardener = 1 × 10 ml = 10 ml (0.34 US fluid ounces).

Step 5: Check the total.

20 ml + 10 ml = 30 ml (1.01 US fluid ounces).

To check the calculation another way, divide the resin volume by the hardener volume: 20 ÷ 10 = 2. The result matches the example's 2:1 ratio.

If you want a 45 ml (1.52 US fluid ounces) batch at the same example ratio, divide 45 ml by 3. One part is 15 ml (0.51 US fluid ounces), so the resin is 30 ml (1.01 US fluid ounces) and the hardener is 15 ml (0.51 US fluid ounces).

What is the right way to mix a small batch?

1. Read the product label and instructions. Confirm the required ratio, whether it is measured by volume or weight, and whether the product supports the intended batch size.
2. Prepare a clean, suitable mixing container and the measuring tools needed for the required quantities.
3. Measure each component separately, following the specified ratio and measurement method. Read liquid graduations at eye level where the tool design requires it.
4. Combine the components in the order stated by the manufacturer. Avoid changing the ratio to compensate for material left in a container.
5. Mix for the time and using the method specified by the product maker. Scrape the sides and bottom if the instructions call for it, so material is incorporated throughout the mixture.
6. Use the mixture within the stated working time and follow the manufacturer's curing instructions. Consult the product instructions and safety data sheet for handling and protective measures.

Do not assume that a small quantity can be mixed for less time. The correct mixing method is determined by the product instructions, not by the batch volume alone.

What mistakes waste small resin batches?

In a small batch, a little material or a small measuring error can account for a noticeable share of the total. The table below uses examples to show how errors affect quantities and costs. The prices are hypothetical, not market quotes.

The cost example assumes a uniform price per milliliter. The wasted resin costs $1.00 because $20 ÷ 100 ml = $0.20 per ml, and 5 ml × $0.20 per ml = $1.00.

Another common error is using the wrong ratio basis. A correct calculation by volume will still be wrong if the product requires measurement by weight. Always check the label before calculating the components.

Rounding can also matter. If the calculation requires a quantity smaller than your measuring tool can reliably show, do not round each component independently and assume the ratio remains correct. Choose a suitable measuring method or a batch size supported by the product instructions.

When do small-batch calculations stop being reliable?

The ratio calculation tells you the intended amounts, but it cannot guarantee a successful cure. Measuring limits, material left in tools, incomplete mixing, and product-specific restrictions can affect the result.

Very small quantities may fall below the practical measuring range of a syringe or scale. If your tool cannot distinguish the required quantity from a meaningful measurement error, the calculated result may not be achievable with that tool.

Small batches may also behave differently from larger batches during curing. The amount, container shape, room conditions, and product formulation can affect working time and heat buildup. Do not assume that a product's guidance for a larger pour automatically applies to a small batch.

Finally, the ratio formula only works when the chosen total volume and ratio are appropriate for the product. It cannot replace the maker's stated minimum batch size, mixing instructions, or curing conditions. If the product does not support the quantity you intend to mix, the arithmetic alone cannot establish that the batch will cure correctly.

To price resin art, add the cost of the materials used, your labor, and a fair share of your business expenses. Then add your desired profit or apply a markup to your total cost, depending on how you want to set your selling price.

The difficult part is counting everything that goes into a finished piece. Resin, pigments, molds, packaging, sanding supplies, and time can all affect the price. A resin material cost calculator can help you work out the material cost before you set your final price.

Which costs belong in the price of resin art?

Start by separating your costs into three groups: materials, labor, and overhead. Overhead means the ongoing expenses of running your business that are not tied to one specific piece.

Material costs include epoxy resin, hardener, pigments, glitter, inclusions, backing boards, and other items that become part of the finished work. Include disposable mixing cups, stir sticks, gloves, and sanding supplies when you use them for production.

Labor is the value of the time spent making and finishing the piece. It can include preparing the mold, measuring and mixing, pouring, removing the piece, sanding, polishing, and packing the order.

Overhead includes expenses such as workshop rent, electricity, equipment maintenance, and website costs. Allocate a reasonable share to each piece rather than charging the entire monthly bill to one customer.

Keep these groups separate in your records. Otherwise, a piece can appear profitable because you counted its resin but ignored your time and operating expenses.

How do you calculate the material cost?

Calculate the cost of the amount you actually use, not the full price of every container you own. If you buy a large bottle of resin, only the portion used for a particular piece belongs in that piece's material cost.

Use this formula for each material:

Material cost = quantity used ÷ quantity purchased × purchase price

Keep the units consistent. If you buy resin by the liter, measure the amount used in liters. If your supplier sells it by weight, use matching weight units instead.

For example, suppose a resin kit costs $40 for 2 liters, and a project uses 0.3 liters. These are example figures, not quoted market prices.

Cost per liter = $40 ÷ 2 liters = $20 per liter.

Resin used = 0.3 liters × $20 per liter = $6.

Repeat the calculation for pigments, backing materials, decorative items, and consumables. Add those amounts to find the material cost of the finished piece.

For a two-part resin system, follow the manufacturer's specified mixing ratio. Do not estimate the amount of hardener independently if the kit instructions define how the components must be measured.

How do you price resin art step by step?

1. List the materials. Write down every material and disposable supply used for the piece. Estimate the quantity consumed from your measurements or production records.
2. Calculate the material cost. Divide each purchase price by the quantity purchased, then multiply by the quantity used. Add the individual costs.
3. Calculate labor. Record the active work time in hours and multiply it by your chosen hourly labor rate. Do not count curing time as active labor unless you are actually working during that period.
4. Allocate overhead. Choose a consistent method for sharing business expenses across your products. For example, divide a monthly expense by the number of pieces produced during that month, if those pieces are reasonably comparable.
5. Add selling expenses. Include applicable marketplace fees, payment processing charges, packaging, and shipping costs you agree to cover. Check the actual fee structure for your sales channel.
6. Set your price. Add the costs and then apply your chosen profit or markup method. Compare the result with similar work and the price customers are willing to pay.

Keep a record of the assumptions behind each estimate. If a project uses an unusually expensive pigment or requires several hours of polishing, its price should reflect that extra cost.

How can you use a resin cost calculator?

A resin cost calculator can help you estimate how much material a project consumes. The result is only as useful as the measurements and prices entered.

1. Enter the amount of resin used for the project, using the same unit as your purchase quantity.
2. Enter the quantity of resin or resin kit you purchased.
3. Enter the purchase price for that quantity.
4. Repeat the calculation for other materials if the calculator supports separate material entries. Otherwise, calculate each item separately and add the results.
5. Record the material cost, then add labor, overhead, selling fees, and other costs the calculator does not include.

Check which costs the live calculator includes before using its result as your production cost. A material-only result is not a finished selling price.

Worked example: what should a resin art piece sell for?

Suppose you make one decorative resin tray. The following figures are examples chosen to show the arithmetic, not typical prices or earnings.

The production cost is $44.00. This amount covers the listed materials, labor, and overhead, but it does not yet include selling fees or any shipping expense paid by the seller.

Suppose the example seller wants a 25% markup on production cost. Markup is the extra amount added to cost, expressed as a percentage of cost.

Markup = $44.00 × 0.25 = $11.00.

Price before selling expenses = $44.00 + $11.00 = $55.00.

Now suppose the seller pays an example selling fee equal to 5% of the final selling price. The fee is based on the selling price, so adding 5% of the production cost would not fully account for it.

To keep the $11.00 markup after that fee, solve for the price:

Price = (production cost + desired markup) ÷ (1 − fee rate).

Price = ($44.00 + $11.00) ÷ (1 − 0.05) = $55.00 ÷ 0.95 = $57.89, rounded to the nearest cent.

At $57.89, the example fee is about $2.89. Subtracting the $44.00 production cost and $2.89 fee leaves about $11.00.

This example shows why a price that covers materials alone can fall short. It also shows that a markup and a profit margin are different measures. A $55.00 price on $44.00 of production cost gives a 25% markup, but the $11.00 difference is 20% of the $55.00 selling price before other selling expenses.

What pricing mistakes can reduce your earnings?

Small omissions can change the result. Use the following examples to see what each mistake costs.

Another mistake is treating all resin purchased as if it were consumed by one piece. If you buy 2 liters but use 0.3 liters, charging the full kit price to that piece overstates its material cost and makes comparisons between products unreliable.

There is also a risk in pricing solely by copying another seller. Their labor rate, production volume, supply costs, product quality, and selling fees may differ from yours. A similar-looking item can take much longer to finish.

When does this pricing method become unreliable?

The calculation gives an estimate, not a guaranteed selling price. Material use can vary because of spills, failed pours, surface preparation, trimming, and pieces that need to be remade. If these losses occur regularly, record them and include a reasonable allowance based on your own production records.

Overhead allocation also becomes less reliable when products vary greatly in size or production time. Dividing monthly expenses equally across a small tray and a large table may distort the cost of each. A time-based or product-specific allocation may give a more useful estimate.

Finally, a cost-based price does not prove that buyers will pay it. Compare products with similar dimensions, finish, design, and customization, while checking whether their listed prices include delivery or other charges. If your calculated price is above the prices buyers accept, review the design, production process, costs, or target market instead of assuming the cost calculation is wrong.

The method also cannot predict demand, account for every unexpected production failure, or determine the value of a unique design on its own. Those questions require evidence from your own sales and the market you serve.