QuestionGauge & yarnBy The Hook Desk20 Aug 2026

My gauge is off. Should I change hook or change yarn?

Q: My gauge is off. Should I change hook or change yarn?

Change the hook. Hook size moves stitch width and height by about 5-8% per 0.5 mm, which is enough to close most gaps. Change the yarn only when the fabric itself is wrong — a stiff DK that will not drape, or a lace weight being asked to hold a shape.

Gauge is the only measurement that decides whether the finished object matches the numbers in the pattern. It is also the thing most people skip, then blame on the pattern.

Round-by-round schematic Two gauges of the same disc: the outer coral ring is the same round worked 10% looser, one hook size up.

Step by step

Note 1Measure before you decide anything

Work a 15 x 15 cm swatch in the stitch the pattern uses, then measure the middle 10 cm in three places and average. Do not measure the edges — the first and last two stitches of every row are distorted by turning.

Write both numbers down: stitches per 10 cm and rows per 10 cm. Patterns usually quote stitches only, but rows matter more in the round, because a spiral has no row to hide an error in.

Note 2Deciding between hook and yarn

If your stitch count is within 10% and the fabric feels right, change the hook: half a millimetre at a time, one direction only. Going from 3.5 mm to 4.0 mm typically buys about one extra stitch per 10 cm in DK weight.

Change the yarn when the problem is not arithmetic. If a 4 mm hook at recommended gauge produces a fabric you could stand a mug on, the yarn is too heavy for the item and no hook will fix it — you need a lighter weight at a looser gauge, not a bigger hook at the same one.

Note 3When to stop adjusting and re-plan

If closing the gauge gap needs more than 1 mm of hook change, the pattern and the yarn are mismatched. Either pick a different yarn or work at your own gauge and recalculate: a 12 cm ball at 22 sts / 10 cm becomes a 13 cm ball at 20 sts / 10 cm, and the increase rounds still work.

For amigurumi, being one stitch tight per 10 cm is usually harmless because the piece is stuffed outward. For a garment or a hat, one stitch per 10 cm over a 50 cm circumference is five stitches of error, which is the difference between a hat that fits and one that leaves a mark.

Where it usually goes wrong

Measuring a swatch straight off the hook. Let it rest flat for an hour, or steam it the way you will wash the finished piece.
Measuring rows with the swatch stretched. Rows compress; measure them relaxed.
Buying one hook size and assuming it is the pattern's size. Hook sizing is not standardised across brands — a 4.0 mm from one maker is not always a 4.0 mm from another.

My gauge is off. Should I change hook or change yarn?

Step by step

Where it usually goes wrong

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