How to Measure Knitting Gauge: Recalculating Stitches and Rows When It Differs
When you've followed the pattern yet your sweater comes out too big or too small, gauge is usually the reason. This article covers what gauge means (stitches and rows in a 10 cm square), how big a swatch to make and how to measure it properly, whether to change needles or stitch counts when it doesn't match, the formulas for adapting a pattern's stitches and rows to your gauge, and how to round to a pattern's repeat, such as 2×2 rib.
What is gauge? How much difference one stitch makes
Gauge is the number of stitches and rows that fit into a 10 cm square of fabric. Japanese patterns write it like "stockinette 22 sts × 30 rows (10 cm square)." Even with the same yarn and needle size, stitch size varies with each knitter's tension, so your gauge won't necessarily match the designer's.
If your gauge differs, the finished dimensions change by the ratio of pattern gauge ÷ your gauge. For a pattern at 22 sts with a body 110 stitches (50 cm) wide, here is the finished width at each gauge.
| Your gauge (per 10 cm) | Width knitting 110 stitches | Difference from pattern |
|---|---|---|
| 20 sts (2 sts looser) | 55.0 cm | +5.0 cm |
| 21 sts (1 st looser) | About 52.4 cm | +2.4 cm |
| 22 sts (same as pattern) | 50.0 cm | ±0 |
| 23 sts (1 st tighter) | About 47.8 cm | −2.2 cm |
| 24 sts (2 sts tighter) | About 45.8 cm | −4.2 cm |
Even one stitch per 10 cm changes one body panel by over 2 cm, and the chest around the front and back by nearly 5 cm. The more dimensions matter, as with sweaters and cardigans, the more it's worth checking your gauge before you start.
Swatch size and how to measure gauge properly
To measure gauge, knit a swatch with the same yarn, needles and stitch as the real thing. Edge stitches tend to distort, so the basic approach is to knit larger than 10 cm and count the central 10 cm.
- 1
Knit at least 15 cm square
Cast on 15 cm's worth of stitches from the pattern's gauge (about 33 stitches at a 22-st gauge) and knit to at least 15 cm high. For a textured project, knit it in that pattern.
- 2
Finish it as you will the project
If you'll wash or steam the real thing, do the same to the swatch and let it dry. Washing settles the stitches, and with some yarns the gauge changes by 1–2 stitches.
- 3
Count the central 10 cm
Lay it flat, place a ruler without stretching, and count the stitches and rows within 10 cm. Counting to half a stitch improves accuracy.
- 4
Convert if it isn't exactly 10 cm
If it doesn't divide neatly at 10 cm, convert to a per-10 cm figure from the stitches counted and the actual width: stitches ÷ width (cm) × 10.
For example, if 23 stitches measure 10.5 cm and 32 rows measure 10.7 cm, that's 23 ÷ 10.5 × 10 = about 21.9 stitches and 32 ÷ 10.7 × 10 = about 29.9 rows, almost the same gauge as a 22 sts × 30 rows pattern. In the tool's "Gauge conversion" tab, enter the swatch's stitches and rows and the measured lengths to convert to a per-10 cm gauge automatically.
If it doesn't match: change needles or stitch counts?
There are two fixes when your gauge differs from the pattern: change the needle size, or recalculate the stitches and rows. The recommended order is to change needles first to get closer to the pattern's gauge, and then calculate your way there if it still doesn't match or if you don't want to change the feel of the fabric.
| Your gauge | What it means | To fix with needles |
|---|---|---|
| More stitches than the pattern | Tight stitches (finishes smaller) | Reknit with needles 1–2 sizes larger |
| Fewer stitches than the pattern | Loose stitches (finishes larger) | Reknit with needles 1–2 sizes smaller |
| Stitches match, rows differ | Only the vertical dimension is off | Keep the needles and recalculate rows |
- Changing needles also changes the feel of the fabric. Larger makes it softer, and smaller makes it firmer
- It's hard to match both stitches and rows with needles. The usual approach is to prioritize stitches, which set the width, and match rows by calculation
- Track sleeve and body lengths by measurement ("knit X cm") rather than row count, so a row-gauge difference matters less
Formulas for adapting a pattern's stitches and rows to your gauge
To convert stitches and rows without getting lost, first go back to dimensions (cm), then convert to stitches and rows at your own gauge.
- 1
Convert stitches back to a dimension
With 110 stitches at a pattern gauge of 22 sts: 110 ÷ 22 × 10 = 50 cm.
- 2
Convert to stitches at your gauge
If your gauge is 20 sts: 50 × 20 ÷ 10 = 100 stitches.
- 3
Calculate rows the same way
With 150 rows at a pattern gauge of 30 rows: 150 ÷ 30 × 10 = 50 cm. If yours is 28 rows: 50 × 28 ÷ 10 = 140 rows.
| Your gauge | 110 stitches (50 cm) becomes | 150 rows (50 cm) becomes |
|---|---|---|
| 20 sts × 28 rows | 100 stitches | 140 rows |
| 21 sts × 30 rows | 105 stitches | 150 rows |
| 23 sts × 30 rows | 115 stitches | 150 rows |
| 24 sts × 32 rows | 120 stitches | 160 rows |
After converting stitches, the number of increases and decreases and the spacing between rows change by the same ratio. You can recalculate positions for even increases and decreases within a row with Calculating Even Increases and Decreases, and spacing for shaping every few rows, as under a sleeve, with Reading and Calculating Shaping Notation.
Rounding to a pattern's repeat (rib and textured stitches)
The stitches you calculate may not work as they are. Patterns have set repeats: 1×1 rib is a multiple of 2 plus 1 stitch, and 2×2 rib knit flat is a multiple of 4 plus 2 stitches (with 2 knit stitches at each edge), so round to the nearest multiple. Rounding shifts the dimensions slightly, so check that the shift is acceptable.
| Stitch (knit flat) | 50 cm at a 20-st gauge | Rounded stitches | Finished width |
|---|---|---|---|
| Stockinette (no restriction) | 100 stitches | 100 stitches | 50.0 cm |
| 1×1 rib (multiple of 2 + 1) | 100 stitches | 101 stitches | 50.5 cm |
| 2×2 rib (multiple of 4 + 2) | 100 stitches | 102 stitches | 51.0 cm |
For 2×2 rib in the round, the start and end join, so use a multiple of 4. For a hat 54 cm around at a 22-st gauge, 54 × 22 ÷ 10 = 118.8 stitches, so use 120 stitches, a multiple of 4 (about 54.5 cm). For rows, when knitting flat with right and wrong sides alternating, rounding to an even number means you always finish on the same side, which is easier to handle.
In the tool, just enter the pattern's gauge and yours, the stitches and rows and the pattern's repeat to see the rounded stitches, the resulting finished size and what you'd get by following the pattern as written, all at once. You can also get the cast-on count from a dimension in cm.
FAQ
- How big should a gauge swatch be?
- At least 15 cm square is recommended. Edge stitches tend to distort, so make it big enough to count the central 10 cm. Knit textured projects in the pattern, and if you'll wash the real thing, wash the swatch too before measuring.
- How much does a one-stitch gauge difference change the size?
- Knitting a 22-st pattern at a 21-st gauge makes it about 4.8% bigger. A 110-stitch (50 cm) body becomes about 52.4 cm, and the chest around the front and back grows by nearly 5 cm.
- If I get too many stitches, should I use larger needles?
- Yes. Too many stitches means your tension is tight, so reknit the swatch with needles 1–2 sizes larger. If you get too few (loose), use smaller needles. If changing needles doesn't match it, recalculate the stitches for your gauge.
- What if only my row gauge differs?
- The width doesn't change, so keep the needles and recalculate only the rows. 150 rows (50 cm) at a 30-row pattern gauge is 140 rows at a 28-row gauge. It also helps to check body and sleeve lengths by measurement as you knit.
- Why does a 2×2 rib cast-on use a multiple of 4 plus 2?
- 2×2 rib has a 4-stitch repeat: 2 knit and 2 purl. Knit flat, having 2 knit stitches at both edges makes it symmetrical, so you add 2 stitches to a multiple of 4. In the round, the start and end join, so you use a multiple of 4.
Tools in this article
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