About Craft Numbers

Craft Numbers is a collection of free calculators for people who make things by hand and sell them: candle and soap makers, resin artists, knitters, sewists and 3D printing hobbyists.

Every tool runs entirely in your browser. Your inputs are never sent to a server or stored.

Formulas follow the conventions used by major suppliers and reference books. Where suppliers disagree (for example whether fragrance load is measured against wax or the whole batch), each tool states which convention it uses.

Results are estimates to help you plan. Always follow the safety data and maximum ratios published by your material supplier.