Free calculators for makers

Measure twice.Pour once.

Recipe, material and pricing calculators for candles, soap, resin, yarn, sewing and 3D printing. Every formula is on the page, and nothing you type leaves your browser.

Jump toSoap lye (NaOH)Fragrance load Yarn yardage FDM print cost

Candle fragrance loadExample

Wax

500 g

Fragrance load

8 %

Fragrance oil to add

40.0g

Total batch540.0 g

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Pick your craft

20 calculators across 9 crafts, each with its formula and a worked example.

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Candle making

2 calculators

Soap & bath

4 calculators

Resin

2 calculators

Knitting & crochet

2 calculators

Macramé & cord

1 calculator

Macramé cord length

Pottery & ceramics

1 calculator

Clay shrinkage

Sewing & quilting

5 calculators

3D printing

2 calculators

Pricing & selling

1 calculator

Handmade pricing

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Every page shows its formula and a worked example, so you can check the math against your own notes.

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English and 한국어

Every calculator is available in both languages, with the same formulas.