Calculating Stitch Counts for a Different Size
When a pattern does not include your size, you can usually calculate a custom size by scaling the stitch count proportionally. The math is simple but worth doing carefully — small errors compound across hundreds of stitches.
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Find your gauge
Knit a swatch in the project yarn and stitch. Measure stitches per inch and rows per inch.
Decide your finished measurements
For a sweater, the most important measurement is the bust circumference — typically your bust + 2–4 inches of ease for a fitted look, or + 4–8 inches for a relaxed fit.
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Calculate stitch count
Multiply finished bust circumference (inches) by stitches per inch. Round to the nearest stitch repeat (4 stitches for k2p2 ribbing, 8 stitches for some cables, etc.) so the pattern repeats line up.
Calculate length
Multiply finished length (inches) by rows per inch. Round to the nearest pattern row repeat. Add length for ribbing, neck shaping, and any other features.
Abbreviation reference
| Abbreviation | Meaning |
|---|---|
| st(s) | stitch(es) |
Tips
- Always swatch first — gauge calculations from an unswatched yarn are guesses.
- Round to the nearest pattern repeat to keep the design lined up.
- Calculate twice; knit once.
In depth
Custom sizing math is straightforward arithmetic but every step depends on accurate gauge. A small error in the gauge swatch propagates through every calculation, so the swatch is the most important step in custom sizing.