Tension & Gauge
What is Gauge?
Gauge (or tension) is the number of stitches and rows that fit into a given measurement — usually 4 inches (10cm). Every knitter is different. Two people using identical yarn and identical needles can produce fabric of different sizes because they hold the yarn and needles differently.
Patterns specify a target gauge because the designer knitted to that gauge to achieve the stated finished dimensions. If your gauge is off, your finished item will be the wrong size.
Why Gauge Matters More in Knitting
A 1-stitch-per-4-inches discrepancy sounds small, but over 200 stitches on a sweater body, it adds up to 2–3 inches of extra width. A jumper that's supposed to be a 38-inch chest becomes a 40-inch chest — or a 36-inch. For garments, gauge matching is non-negotiable.
For non-fitted items (scarves, dishcloths, basic blankets), gauge matters less — the item may just be slightly larger or smaller than stated, which is usually fine.
How Gauge is Written in Patterns
You'll see something like: "22 sts and 30 rows = 4 inches (10cm) in stockinette stitch on US 7 (4.5mm) needles." This tells you exactly how many stitches wide and rows tall a 4-inch square should be in the specified stitch pattern.
Making a Gauge Swatch
A gauge swatch is a small test square you knit before starting your project. It's the only way to know whether your tension matches the pattern's — and to make adjustments if it doesn't.
How to Knit a Good Swatch
- Cast on more stitches than you need. If the gauge calls for 22 stitches per 4 inches, cast on at least 30–32. Edge stitches are often distorted and shouldn't be measured.
- Use the same stitch pattern as the gauge note. If it says "in stockinette stitch," knit your swatch in stockinette. Don't swatch in garter if the pattern gauge is for stockinette.
- Work at least 5–6 inches in length. The first few rows are also often distorted. You need enough rows to measure accurately in the middle.
- Finish the swatch properly. Cast off, weave in ends, and wash/block the swatch exactly as you plan to treat the finished item. Some yarns grow or shrink significantly after washing.
- Let it rest flat before measuring. Don't measure right off the needles — the yarn needs to relax.
Measuring Your Swatch
- Lay the blocked swatch on a flat surface without stretching it.
- Place a ruler or tape measure horizontally across the middle of the swatch (avoiding the first and last inch).
- Count stitches: Count the number of V's (knit stitches) across exactly 4 inches. Include half-stitches in your count.
- Place the ruler vertically and count rows: Count the number of rows (V's stacked) over exactly 4 inches.
- Compare your counts to the pattern's stated gauge.
Imperial vs Metric
UK and Australian patterns often state gauge per 10cm. US patterns usually use 4 inches. The measurements are close but not identical: 4 inches = 10.16cm, so always use whichever unit the pattern specifies.
Fixing Your Tension
If your gauge doesn't match the pattern, adjust your needle size — not your knitting style.
Too Many Stitches Per 4 Inches (Fabric Too Tight)
Your stitches are too small — you're knitting too tightly. Go up one needle size and swatch again. Keep going up until your gauge matches.
Too Few Stitches Per 4 Inches (Fabric Too Loose)
Your stitches are too large — you're knitting too loosely. Go down one needle size and swatch again.
Stitch Gauge Matches but Row Gauge Doesn't
This is common and usually less critical for most projects, because you can work to a length measurement rather than a row count. However for patterns with precise shaping (raglan, short rows), row gauge matters. Sometimes switching to a different needle material (metal vs wood) subtly affects row gauge.
What About Yarn?
Different yarns in the same "weight" category can knit up differently — a dense merino and a fluffy mohair both labelled DK may need different needle sizes to hit the same gauge. Always swatch with your actual project yarn.