FiberTools
Free browser calculators for knitting, crochet, weaving and spinning
What it is
FiberTools is a set of 28 fiber-arts calculators covering yarn estimates, gauge conversion, cast-on counts, blanket and sock sizing, and amigurumi round schedules. Each one shows its working, runs in the browser without a login, and keeps your inputs on the device. The self-service calculators stay free; optional pattern reviews and project downloads are the paid part.
- Maker
- Jason Ramirez
- Category
- Other
- Listed
- September 20, 2026
- knitting
- crochet
- calculator
- crafts
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