Soap Mold Volume Calculator

Volume of a rectangular, cylindrical or loaf soap mould in cubic inches and millilitres, and the batter weight it holds at 0.4 ounces per cubic inch.

Mould shape

Inside length in

Rectangular and loaf moulds.

Inside width in

Rectangular and loaf moulds.

Inside diameter in

Cylindrical moulds, measured across the inside.

Depth you fill to in

The height you actually fill to, not necessarily the full height of the mould.

Weight of one bar oz

Used to turn the volume into a bar count.

Batter lost to trimmings %

The ends, the top and the bit that stays in the pot.

Water as a percentage of oils %

Only used for the rough oil estimate. Cold process recipes usually sit between 33 and 38 percent.

Fragrance or essential oil load %

Only used for the rough oil estimate, as a percentage of the oil weight.

Lye solution, as a percentage of the oil weight % of oil weight

Used only for the rough oil estimate. The real alkali figure comes from a lye calculator.

Reset

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