Cast-On Calculator

How this works

Cast-on math is simple but easy to get wrong by hand. Multiply your desired finished width by your gauge (stitches per inch) and round to a whole number. We do that for you — and we round to your stitch repeat if you have one. Once you know your cast-on count, the row-count calculator works out how many rows to knit for your finished length.

What's a stitch multiple?

Many stitch patterns repeat every N stitches. K2P2 ribbing repeats every 4 stitches. Setting a stitch multiple ensures your cast-on count fits the pattern cleanly so you don't end with a half-rib.

Tips for getting accurate gauge

• Knit a swatch at least 4 inches × 4 inches in your project pattern.
• Wash and block the swatch — gauge changes after blocking.
• Measure stitches across the middle (not the edges) of the swatch.
• If your gauge differs from the pattern's, the gauge converter adjusts the numbers so your finished size still comes out right.
• If you're between two gauges, go down a needle size and re-swatch.