🧶 Knitting Gauge Calculator

Enter your swatch gauge and target size to calculate the stitches and rows needed, plus an estimated yarn amount.

Stitches Needed

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Stitches Needed — Rows Needed — Estimated Yarn Needed —

If you enter a swatch weight, we estimate total yarn including a 10% allowance for seaming and finishing waste.

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GUIDE

Learn more

What Is Gauge and Why Does It Matter?

Gauge is the number of stitches and rows that fit within a 10cm × 10cm swatch. Since gauge varies by tension even with the same yarn and needles, if your swatch gauge differs from the pattern gauge, your finished project can come out significantly the wrong size. Always knit a swatch at least 10cm across using your actual yarn, needles, and stitch pattern, then measure after washing/blocking for an accurate result.

Measuring gauge over a 10cm×10cm (4in×4in) swatch is standard practice as recommended by the Craft Yarn Council's Standard Yarn Weight System.

Formulas for Stitches, Rows, and Yarn Amount

Stitches needed = Gauge stitches ÷ 10 × Target width (cm)
Rows needed = Gauge rows ÷ 10 × Target height (cm)

To estimate yarn needed, enter the weight (g) of your 10x10cm swatch. Since the swatch area is 100cm², yarn weight per cm² = swatch weight ÷ 100, and estimated yarn (g) = yarn per cm² × width × height × 1.10. The 1.10 factor is a 10% allowance for seaming, finishing, and knot waste — a practical rule of thumb widely used in the knitting community.

Item	Formula
Stitches needed	Gauge stitches ÷ 10 × width
Rows needed	Gauge rows ÷ 10 × height
Yarn (g)	(Swatch weight ÷ 100) × width × height × 1.10

Frequently asked questions

How big should my gauge swatch be?

Knit a swatch larger than 10cm × 10cm (ideally 12-15cm) to avoid edge distortion, and measure only the center 10cm section.

What if my gauge does not match the pattern?

The most accurate fix is to re-swatch with a different needle size — go up a size if you have too many stitches, or down a size if too few, until you match the pattern gauge.

How accurate is the yarn estimate?

The swatch-weight-based estimate is approximate. Actual usage varies with stitch pattern complexity (cables, lace, etc.), seaming method, and edge treatment, so consider keeping an extra skein on hand even after the 10% allowance.