How to Knit, Measure, and Convert a Gauge Swatch

A gauge swatch is the small piece of knitting that decides whether your sweater will fit in the end: you knit a square of at least 15 × 15 cm, wash it, and count how many stitches and rows there are in 10 cm. Here we show you step by step how to knit the swatch, measure it correctly, and use it to calculate how many stitches to cast on. You’ll also learn what to do if your numbers don’t match the pattern and how to estimate your yarn requirements from the weight of the swatch.

What is a gauge swatch, and why is it so important?

Almost every knitting pattern includes a line like “16 sts and 22 rows = 10 × 10 cm” (sts = stitches). This means that with the specified yarn and needle size, 16 stitches side by side make 10 cm in width and 22 rows stacked on top of each other make 10 cm in height, measured in the main stitch pattern, usually stockinette. All the stitch counts in the pattern are based on this gauge.

But how tightly people knit varies a lot. If your stitches are larger or smaller than the pattern’s, the measurements will be off – and the bigger the piece, the more noticeable the difference.

Worked example: 180 stitches, three results

A pattern written for 16 sts / 10 cm has you cast on 180 sts in the round for the body of a sweater. That gives you a circumference of 112.5 cm – but only if your gauge matches:

So a difference of just two stitches over 10 cm can turn a relaxed sweater into a snug one, or the other way around. If you knit loosely, you’ll also use more yarn. If you’re planning your first sweater, take a look at our guide Knitting a Sweater for Beginners, too.

Knitting a gauge swatch: step by step

The most important rule: everything has to be the same as in your project later on. Knit as relaxed as you normally do – if you’re extra careful with your swatch, you’ll often knit more tightly.

1. Choose the yarn, needle, and stitch pattern

• The same yarn: ideally from one of the balls for your project. A different yarn with a similar yardage won’t automatically give you the same results.
• The same needle: the same size and, if possible, the same material. Many people knit more loosely on smooth metal needles than on wooden ones.
• The same stitch pattern: the one the pattern gives the gauge for, usually stockinette.

2. How big does a gauge swatch need to be?

At least 15 × 15 cm, and a bit bigger is fine. You only measure in the middle, because the stitches at the edges and right above the cast-on are distorted.

As a rule of thumb, cast on the number of stitches the pattern gives for 10 cm plus 8–10 sts. For 16 sts / 10 cm, that’s 24–26 sts, or a width of about 15–16 cm. With fine yarn, add a few more so the swatch isn’t narrower than 15 cm.

3. Add a garter stitch border so the swatch lies flat

Stockinette curls at the edges, and a curled-up swatch can’t be measured accurately. That’s why it gets a garter stitch frame:

1. After casting on, knit 3–4 garter ridges, which is 6–8 rows of knit stitches only.
2. Then continue in your stitch pattern, knitting the first and last 3–4 sts of every row.
3. When the swatch is about 13 cm high, knit another 3–4 garter ridges across all stitches.
4. Bind off loosely. There’s no need to weave in the ends.

4. Knitting a gauge swatch in the round

If your project is knit in the round, such as a hat or a sweater without side seams, knit your swatch in the round as well. In the round, stockinette means knitting every stitch. Because many knitters purl more loosely than they knit, the numbers often differ from those of a swatch knit flat.

Instead of a small tube on double-pointed needles, you can also knit a flat swatch, often called a “speed swatch”: knit one row on a circular needle, slide the stitches back to the other needle tip without turning, bring the yarn loosely across the back of the work to the beginning, and knit the row again. Leave the long strands across the back generously loose, and only measure in the middle.

Wash and dry it like the finished piece

Do you have to wash your gauge swatch? Yes, if you’ll be washing the finished piece later. During the first wash, the fibers relax, the stitches even out, and the swatch often gets a little wider or longer. If you measure before washing, you’ll be working with the wrong numbers.

This is especially noticeable with yarns that contain alpaca or mohair. Alpaca is less elastic than sheep’s wool and can grow in width and length after washing. With mohair, the fine fibers bloom, and the open look of the stitches changes visibly.

1. Wash the swatch the way you’ll wash the finished piece later – for our yarns, that means hand wash at 30 °C.
2. Gently press out the water without wringing, and briefly roll the swatch up in a towel.
3. Let it dry flat without stretching it. If you’ll be blocking the finished piece with pins later, block the swatch the same way.
4. Don’t measure until it’s completely dry.

You’ll find more on this in our guide How to Wash Wool.

Measuring correctly: counting stitches and rows

Lay the dry swatch on a table without stretching it or pushing it together. A rigid ruler is more accurate than a tape measure.

1. Count the stitches: Place the ruler horizontally across the middle, away from the garter border. Each “V” in the stockinette fabric is one stitch. Count the stitches over 10 cm, including half stitches.
2. Count the rows: Place the ruler vertically and count the “V”s stacked on top of each other over 10 cm.
3. Measure several times: Measure in two or three places and take the average.

Why count half stitches? At 16.5 instead of 16 sts / 10 cm, the 180 sts from the example above give you only about 109 cm instead of 112.5 cm. For an even more accurate result, measure the other way around: count off 20 sts and measure their width. If they come to 12.5 cm, calculate 20 × 10 ÷ 12.5 = 16 sts / 10 cm.

Calculating with your gauge: stitches and rows for your project

With your numbers, you can work out how many stitches you need for any measurement, even without a pattern:

Stitches = width in cm × stitches per 10 cm ÷ 10
Rows = height in cm × rows per 10 cm ÷ 10

Three examples with 18 sts and 24 rows = 10 × 10 cm:

• Scarf, 25 cm wide: 25 × 18 ÷ 10 = 45 sts, plus 2 edge stitches = 47 sts.
• Sweater body in the round, 100 cm circumference: 100 × 18 ÷ 10 = 180 sts.
• Body, 40 cm long: 40 × 24 ÷ 10 = 96 rounds.

Round the result so that your stitch pattern works out. For k2, p2 ribbing in the round, you need a number divisible by 4 – and 180 sts fits exactly.

If your gauge doesn’t match: change needles or recalculate

Your gauge doesn’t match? That happens all the time and isn’t a mistake. You either adjust the needle size or recalculate the pattern.

Adjusting the needle size

• More stitches per 10 cm than the pattern: You knit more tightly. Use a larger needle.
• Fewer stitches per 10 cm: You knit more loosely. Use a smaller needle.

Change sizes in steps of about 0.5 mm and knit a new swatch each time. If the fabric becomes too loose or board-stiff, the yarn isn’t a good match for the pattern, and you’re better off recalculating.

Recalculating the pattern for your gauge

If you like the fabric you get with your needle, convert the stitch counts using the rule of three:

New stitch count = pattern stitch count ÷ pattern stitches per 10 cm × your stitches per 10 cm

Example: The pattern is written for 20 sts / 10 cm, and you get 18 sts / 10 cm.

For the sleeve, round to 64 sts so that you increase the same number of stitches on each side: 14 per side. Also check that your stitch pattern still works out, for example a ribbed cuff or a cable repeat. With a raglan or a round yoke, recalculating quickly gets complicated – if you’re a beginner, it’s easier to change needles instead.

What matters more: stitches or rows?

For the fit, stitches matter most, because they determine the width. Most patterns give the length in centimeters, such as “until the piece measures 40 cm from the cast-on.” Then you simply measure.

Rows become important when the pattern counts in rows, for example for raglan lines or sleeve increases. Then you convert the same way: the pattern says 22 rows / 10 cm and “knit 44 rows,” which is 20 cm. At your 24 rows / 10 cm, that’s 44 ÷ 22 × 24 = 48 rows.

Crocheting a gauge swatch

The same principle applies to crochet, and the swatch is at least as important: crochet tension varies even more from person to person than knitting tension, especially in the height of double crochet stitches.

• Crochet with the hook and in the stitch the pattern specifies: single crochet (sc), half double crochet (hdc), or double crochet (dc). “14 sc and 16 rows = 10 × 10 cm” applies only to single crochet.
• Loosely chain (ch) enough stitches for 10 cm plus 8–10 sts, add the turning chain, and work until the swatch is about 15 cm high.
• Count the stitches and rows over 10 cm in the middle, because the edges are often uneven.
• Too many stitches: use a larger hook. Too few: use a smaller one.

For granny squares and other pieces worked in rounds, the pattern often gives the size after a certain number of rounds. Then crochet exactly those rounds and measure. By the way, you crochet our Wool Nello with Alpaca, 180 m / 100 g with a 5–6 mm hook.

Calculating yarn requirements from the weight of your swatch

Your washed swatch also tells you how much yarn you need. All it takes is a kitchen or postal scale that weighs to the nearest gram.

1. Weigh the dry swatch and divide its weight by its area in cm².
2. Calculate the area of your project. For a sweater, add up the front, back, and sleeves as rectangles.
3. Multiply the project area by the weight per cm² and add about 10% extra as a reserve.

Example: Your swatch measures 15 × 15 cm = 225 cm² and weighs 12 g, which is about 0.053 g per cm². If your sweater has about 1 m² of knitted fabric, i.e. 10,000 cm², that comes to 10,000 ÷ 225 × 12 ≈ 533 g. With a 10% reserve, it’s about 587 g – so you need 6 balls of 100 g each.

For this to work, the swatch has to be knit in your project’s stitch pattern, because cables and textured patterns use considerably more yarn than stockinette. For comparison: for a sweater in size M in Wool Nello with Alpaca, we give 900–1,200 m, which is 5–7 balls. You’ll find these reference values for every yarn in its product description under “Yarn requirements.”

Label your swatch and keep it

Don’t rip out your swatch right after measuring it. Attach a tag and note the yarn, color, needle size, and the stitches and rows per 10 cm – ideally before and after washing. That will save you a lot of work the next time you use the same yarn.

Typical gauges by yardage

The yardage – how many meters there are in 100 g – gives you a rough idea of what numbers to expect even before you buy. If a pattern calls for 16 sts / 10 cm, a yarn with 150–180 m per 100 g is a good candidate. The numbers apply to stockinette on a suitable needle. They are general reference values, not fixed specifications for the yarns listed, and they don’t replace your own swatch.

You’ll find more about yarns for larger needles in our guide Yarn for Needle Sizes 5, 6, and 8.

Our yarns as examples

Merino Wool Bonny, 350 m / 100 g – 93% wool (merino), 5% polyamide, 2% elastane, needle size 3–3.5 mm, in purple and pink. Fine yarn means lots of stitches: for a width of 15 cm, you cast on about 40 sts. The elastane makes the fabric stretchy, so lay the swatch down especially loosely when you measure it.

Virgin Wool Mery, 375 m / 100 g – 85% virgin wool, 15% polyamide, needle size 2.5–3.5 mm, in beige. Cables and textured patterns stay crisp and clear at this weight. For a cabled sweater, knit your swatch in the cable pattern, because cables draw the fabric in considerably.

Wool Nello with Alpaca, 180 m / 100 g – 50% wool, 15% alpaca, 35% acrylic, needle size 4–5 mm, crochet hook 5–6 mm, in green, purple, and orange. The calm, even color makes every stitch easy to see – whether you knit or crochet.

Chunky Yarn Milana with Wool, 130 m / 100 g – 45% wool, 55% acrylic, needle size 6.5–7 mm, in white. With chunky yarn, every half stitch counts for more: at 13 sts / 10 cm, it adds up to almost 4 cm over a 100 cm circumference.

Soft Wool Belanca with Baby Alpaca, 220 m / 100 g – 36% alpaca (baby alpaca), 15% wool, 29% acrylic, 20% polyamide, needle size 4–4.5 mm, in light mint, denim, pink, and light brown. Because of the alpaca content, be sure to measure this one only after washing.

You’ll find more yarns in our Merino Wool, Virgin Wool, Alpaca Wool, and Chunky Yarn categories.

Examples for inspiration

This is what typical gauge swatches look like – in stockinette, in a stitch pattern, crocheted, and in chunky yarn.

Note: The images in this section are AI-generated examples for inspiration.

Frequently asked questions about gauge swatches

Do I always have to knit a gauge swatch?
For items that need to fit – sweaters, cardigans, hats, or socks – yes. For scarves, shawls, and blankets, a few centimeters usually don’t matter; there, the swatch mainly helps you estimate how much yarn you need.

Can I rip out my swatch afterward?
Yes, but ideally only if you actually run short of yarn for your project – until then, it’s useful for comparison. If you don’t need it, label it and keep it.

Does my gauge apply to a different stitch pattern, too?
No. Cables draw the fabric in, and ribbing and lace patterns also behave differently from stockinette. You need a separate swatch for each stitch pattern.

How many stitches make 10 cm?
That depends on the yarn and your needle. With a medium-heavy yarn of 150–180 m per 100 g, it’s often 15–17 sts and about 20–24 rows; with a fine yarn of 350 m per 100 g, it’s considerably more.

We ship the yarns in this guide to you from Görlitz – free within Germany, with no minimum order value. Swatch first, then the sweater – have fun!