CrochetCalc

Free crochet calculators for real projects

Stitch counts, shaping, sizing, and yarn — worked out in seconds. No sign-up, no downloads, every formula shown in plain English.

Pick a calculator

Core counting & shaping

Crochet Stitch Counter Track stitches worked and project the final count from your rows remaining. Open tool Increase & Decrease Calculator Spread shaping evenly across rounds and get 'inc every N sts' spacing. Open tool Decrease Calculator Taper hats, sleeves, and amigurumi with even 'dec every N sts' spacing. Open tool

Sizing & projects

Hat Size Chart Standard sizes from preemie to adult, plus crown math from any head measurement. Open tool Hat Crown Increase Calculator Target crown diameter plus your increase family gives every round's stitch count. Open tool Gauge Calculator Convert any counted swatch into the standard 10 cm / 4 inch gauge. Open tool Blanket Calculator Gauge plus target size gives foundation stitches and total rows — presets included. Open tool Granny Square Calculator One weighed square becomes a full layout, total grams, and a skein count. Open tool Yarn Yardage Calculator Estimate yards or meters for any project from one blocked swatch. Open tool

Frequently asked questions

Are these crochet calculators free to use?

Yes, all nine tools are completely free with no sign-up, no email wall, and no usage limits. The site is static, so every calculation runs in your browser instantly.

Do the calculators work offline?

Once a page has loaded, the math runs entirely in your browser with no server calls. If you keep the tab open, you can keep calculating even if your connection drops.

How accurate are the results?

Each tool shows the exact formula it uses, right under the result. The stitch counter and shaping calculators are exact arithmetic. The yardage, gauge, and blanket estimators depend on your swatch measurements, so measure a blocked swatch for the best estimate.

Can I use these for knitting too?

The stitch counter, gauge converter, and yardage estimator work for any yarn craft because the math is gauge-based. The shaping calculators use even-round spacing that suits both crafts, though knitting patterns often phrase it as "increase every N sts" the same way.

Nothing gets sent to a server — is my data private?

Correct. There is no account system and no analytics on your inputs. Everything you type stays on your device.

Built by someone who actually crochets

CrochetCalc started as a scratched-out note on the back of a washcloth pattern: how many stitches will this blanket end up, and do I have enough yarn? Every formula here is the one used at the table, shown with its math on each tool page so you can check the work — not just trust a black box.