What Is Gauge and Why Does It Matter?

Gauge (or tension) is the number of stitches and rows in a 10×10cm square. It's the single most important factor in whether your project turns out the right size — and the most commonly skipped step.

Why Gauge Matters

Two knitters using the exact same yarn and needles can produce very different fabrics. One knits loosely, one knits tightly. If a pattern says 20 stitches = 10cm and you're getting 22, your sweater will be too small. At 18 stitches, it'll be too big.

A difference of just 2 stitches per 10cm across a sweater can mean 5-8cm difference in the finished bust measurement. That's a full size.

How to Knit a Gauge Swatch

1. Cast on enough stitches for at least 15cm wide (more than the 10cm you'll measure)
2. Knit in the pattern stitch specified until you have at least 15cm of fabric
3. Cast off loosely
4. Wash and block the swatch exactly as you would the finished project
5. Lay flat and measure 10cm in the center of the swatch (edges are unreliable)
6. Count the stitches and rows within that 10cm

Adjusting Your Gauge

• Too many stitches? (fabric too tight) → Go up a needle size
• Too few stitches? (fabric too loose) → Go down a needle size

Sometimes you'll match stitch gauge but not row gauge. Stitch gauge is usually more critical — row count can often be adjusted by knitting to a measurement rather than a row count.

When Gauge Doesn't Matter

Scarves, dishcloths, and amigurumi are forgiving. If it's a bit bigger or smaller, nobody will notice. But for garments, hats, and socks — swatch every time.

Need a gauge ruler? We've got you covered.