Shape of the mold
Measurement unit

Check your data sheet.

Covers resin left on cups and stir sticks. Use 0 for the exact volume.

Mold volume

Volume of one mold38.2 ml
All molds together152.7 ml
Resin to mix167.9 ml
US fluid ounces5.68 fl oz
Weight184.7 g
Weight6.52 oz

Calculator results are planning estimates. Check your resin maker's instructions, mixing ratio, and product limits before pouring.

Choosing a formula for a mold shape

Choose the shape that best matches the cavity and enter its inside measurements. Cylinders use pi times radius squared times height. Boxes use length times width times height, while tapered shapes need both top and bottom dimensions.

Rounded edges, seams, texture, and sloped walls can change the volume from the ideal formula. For a detailed cavity, measure a compatible fill volume when practical and use the formula result as a cross-check.

When you are making several pieces, calculate one mold first, then multiply by the number of matching molds. Apply an allowance only after checking the exact volume.

Mold Shapes Calculator

Estimate the volume of common mold cavities by selecting the closest shape and entering the inside measurements. The result is a geometric estimate for the shape selected.

How to use the mold shapes calculator

  1. Select the shape that most closely matches the cavity.
  2. Measure the inside diameter, height, side length, or other dimensions requested by the selected shape.
  3. Use the same measurement unit for all dimensions.
  4. Enter the number of matching molds and any material allowance.
  5. Review the volume for one mold and the total amount needed.

Where shape formulas have limits

A perfect cylinder, box, hexagon, or hemisphere follows a specific volume formula. Real molds may have rounded corners, texture, sloped walls, or decorative details that change their capacity.

For an irregular cavity, a compatible fill-and-measure method may provide a useful cross-check. Make sure the mold material permits the test liquid and dry it completely if moisture is used.