Is 10cm the same as 4 inches for gauge?

10cm is 3.937 inches, so it is very close to 4 inches but not exactly the same. A gauge of 20 stitches per 10cm equals approximately 20.3 stitches per 4 inches. For most projects this difference is negligible, but for large garments it can add up to a centimetre or more in total width.

Why do some patterns use 4 inches and others use 10cm?

US patterns traditionally use 4 inches as the gauge standard, while UK and European patterns use 10cm. Modern patterns increasingly use 10cm as the international standard. Always check which measurement system your pattern uses before comparing your swatch gauge.

How do I measure gauge accurately?

Use a ruler or gauge tool rather than a tape measure for accuracy. Place pins at exact measurement points and count the stitches between pins. Count half-stitches at the edges. Measure in the centre of your swatch, away from the edges which may be distorted by selvedge stitches.

KnitCalcs

Gauge Conversion Calculator — 10cm, 4-inch & Per-Inch

Convert gauge between 10cm, 4-inch, per-inch, and per-cm measurements.

Gauge Value

Number of stitches or rows

Measured Over

How We Calculate This

This calculator converts gauge measurements between different unit systems using simple ratio mathematics.

Conversion factors

1 inch = 2.54cm
4 inches = 10.16cm
10cm = 3.937 inches

Per cm = Input value / Input measurement width

Convert = Per cm x Target measurement width

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates based on standard yarn weights and gauge. Results may vary with individual tension, yarn brand, and needle size.