Every stitch planned. Every project predictable.

A crochet calculator converts measurements you can take — a gauge swatch, a finished width, a head circumference — into the numbers you need to work from, such as stitches, rows, squares or yards of yarn. It replaces the arithmetic that sits between a measurement and a pattern instruction.

Start with gauge. Almost every other calculation depends on how many stitches and rows you produce over a fixed measurement, so the Gauge Swatch Calculator is the one that makes the rest meaningful. Once you have stitches per inch and rows per inch, the sizing and yardage tools have something real to work from.

Work a swatch, note its size and how much yarn it used, then scale that up by the area of your finished project. Yarn follows area rather than width, so doubling both dimensions roughly quadruples the yarn. The Yarn Yardage Calculator does the scaling and converts the result into yards, metres and skeins.

Yes. A larger shaft diameter forms larger loops, which produces fewer stitches over the same measurement. Hook size is one of three influences, alongside yarn weight and your own tension, which is why a pattern's recommended hook is a starting point rather than a guarantee — the swatch is what settles it.

Divide your swatch stitch count by the measured width to get stitches per inch, then multiply by the width you want. Rows work the same way using height. The Stitch Count Calculator handles both directions and rounds to whole stitches.

The Stitch Count Calculator plans: it tells you how many stitches and rows a target size needs before you begin. The Live Stitch Counter tracks: it holds your running row and stitch count while you crochet, across several projects at once.

No account is required for any calculator, and the tools are built to be used on a phone beside your work. The measurements you type are worked out in your browser rather than being sent to a server, and the Live Stitch Counter saves its projects in your browser's own storage.