| Metric | Pattern | You | Ratio |
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How the math works
Stitches per unit width = pattern_sts / pattern_gauge_width. Adjusted cast-on = target_width × (your_sts ÷ swatch_size). Rows scale the same way using row gauge.
If your gauge has fewer stitches per 10 cm than the pattern, your stitches are larger — go down a needle size to match the pattern. More stitches than the pattern means tighter knitting; go up a needle size.