Gauge calculator
Your gauge, the pattern’s gauge.
Measure a swatch, and this works out what to cast on so the finished piece comes out the size the pattern promised — or what size it will come out if you cast on as written. Knitting and crochet, inches or centimetres.
Step 1 · Measure your swatch
Your gauge: 4.50 stitches and 6.00 rows per inch.
Step 2 · What the pattern asks for
You are knitting looser than the pattern by 10.0%. Cast on as written and the piece would come out 22.2 inches instead of 20.0 inches.
To get the intended size at your gauge, cast on 90 stitches.
Step 3 · Or work back from a finished size
At your gauge that is 90 stitches wide and 120 rows for the same measurement in length.
Measure your swatch after washing and drying it the way the finished piece will be washed. Blocking changes gauge more than most people expect — a swatch measured straight off the needles is measuring a fabric that will not exist by the time anyone wears it.
Gauge is the whole ballgame.
Every other number in a pattern is downstream of gauge. Get it right and a pattern written for someone else’s hands fits yours; get it wrong by half a stitch per inch and a 40-inch sweater comes out at 44. That is not a rounding error, it is a different garment.
The swatch everyone skips is the cheapest hour in the project. An hour of swatching against forty hours of knitting something that does not fit is not a close call — and it is the same arithmetic whether you knit, crochet, or work a colourwork chart, where a gauge mismatch also stretches the picture out of shape.
Gauge questions
Asked constantly, answered once.
- How do I calculate gauge?
- Knit or crochet a swatch at least 6 inches square, wash and dry it the way you will wash the finished piece, then count the stitches across a measured 4-inch span in the middle — never at the edges, which distort. Divide by 4 for stitches per inch. Counting over 4 inches rather than 1 matters: a half-stitch error over one inch becomes a two-inch error across a sweater front.
- My gauge does not match the pattern. What do I do?
- You have two options and they are not equal. The better one is to change needle or hook size and re-swatch — larger for fewer stitches per inch, smaller for more — because gauge is also what makes the fabric feel right. The other is to keep your gauge and recalculate the stitch counts, which this calculator does for you. That works well for flat rectangles like blankets and scarves, and badly for anything shaped or sized, where every instruction downstream assumes the pattern’s numbers.
- How far off is too far off?
- Past about 12% the arithmetic stops being the problem. At that distance the fabric itself is wrong — too stiff if you are tight, too loose and drapey if you are not — and no recalculation fixes a fabric you would not want to wear. Change needle size instead.
- Does row gauge matter?
- Less than stitch gauge for most garments, because length is usually worked to a measurement rather than a row count. It matters a great deal for anything shaped over a set number of rows: raglan sleeves, armhole decreases, and any colourwork chart, where a row-gauge mismatch stretches or squashes the picture.
- Should I measure my swatch before or after blocking?
- After, always. Blocking changes gauge more than most people expect, and a swatch measured straight off the needles is describing a fabric that will not exist by the time anyone wears the garment.
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