Resin Calculator

Work out the millilitres and grams of mixed resin a mould needs, and split it into part A and part B at your ratio.

Mould shape

Length cm

Rectangular moulds only.

Width cm

Rectangular moulds only.

Diameter cm

Circular and cylindrical moulds. The tool uses half of this as the radius.

Pour depth mm

For a domed or irregular shape this is the height of the dome at its highest point.

Height of the cylinder cm

Cylindrical moulds only.

Shape factor

Domed or irregular shapes only. The fraction of the flat volume that the real shape holds. About 0.6 for a gentle dome, 0.8 for a nearly flat casting.

How many pieces?

Waste allowance %

Resin left in the cup and on the stick. A 10 to 15 percent allowance is normal.

Resin density g/ml

Most epoxy products are about 1.05 to 1.2 grams per millilitre. A filler or a heavy pigment raises it.

How is the mixing ratio quoted?

Volume ratios are the usual wording for craft epoxy. A weight ratio is not the same as a volume ratio, because the two parts usually have different densities.

Part A in the ratio

The first number. A 2:1 ratio is part A = 2, part B = 1.

Part B in the ratio

The second number.

Reset

Free calculator by Handcraft worked examples and methodology No account, nothing stored.