Knitting Gauge Calculator

Why Gauge Matters

Gauge is the number of stitches and rows per inch (or 4 inches) in your knitting. Even a tiny difference — half a stitch per inch — compounds over hundreds of stitches and can make a garment dramatically too large or too small. For a 36-inch sweater body, being off by just one stitch per 4 inches can mean a 3–4 inch size difference.

Always knit a swatch before starting any sized project. Knit at least a 6×6 inch square, wash and block it the same way you'll treat the finished item, then measure in the center (edges curl and are unreliable).

How to Swatch Properly

Use the same yarn, needles, and stitch pattern specified in the pattern. Knit a square at least 6 inches wide so you can measure a central 4-inch span without edge distortion. Block the swatch — wet blocking, steam blocking, or whatever finishing the yarn requires — before measuring. Gauge changes after washing, so this step is critical.

If your stitch gauge is off by more than 10%, try going up a needle size (if you have too many stitches) or down a needle size (if you have too few stitches). Row gauge is harder to adjust with needle size but can sometimes be ignored for projects that are worked to a measurement rather than a row count.