Free crochet calculators & converters

The maths behind every project, done for you. No sign-up, works on your phone, and every tool respects US or UK terms and cm or inches.

🧶 Yarn calculatorHow much yarn do I need? Yards, metres and skeins for any project.⛓️ Foundation chain calculatorHow many chains to start, for any width, gauge and stitch.🇺🇸🇬🇧 US ↔ UK terms converterPaste a pattern, convert it. Plus the full conversion chart.💷 Pricing calculatorPrice your makes fairly — time, materials, fees, profit.🪝 Hook size chartmm ↔ US ↔ UK conversion with yarn weights.

Want it all in one place?

These tools are the free, standalone versions of what the Crochets app does automatically: design a piece on a grid and it writes the pattern, counts every stitch and row, calculates the yarn, and shows a photo of the finished piece before you buy a single skein — in your terms, in the hand you crochet with.

Do the math in the app — free

Pattern designer, yarn amounts, row counters and every stitch in the hand you crochet with. No card needed.

Start free →