Crochet Gauge Calculator
The calculator above does the arithmetic that makes gauge useful: compare your swatch with a pattern, predict the finished size of a project at your gauge, or work out how many stitches to chain for a width you want. The numbers are only as good as your swatch, so this page explains how to make and measure one properly.
US/UK note: UK patterns call gauge “tension.” It means the same thing. This page uses US stitch names: US single crochet (sc) is UK double crochet (dc).
What gauge means
Gauge (tension) is how many stitches fit across, and how many rows fit vertically, in a set measurement, almost always 4 in (10 cm). A pattern might say: “16 sc and 18 rows = 4 in (10 cm) using a 5 mm hook.”
Your gauge depends on your yarn, your hook and your hands. Two people using the same yarn and hook often get different gauges. That’s why patterns say “or size needed to obtain gauge.”
How to make a gauge swatch
- Use the same yarn and hook you plan to use for the project.
- Use the stitch pattern the gauge specifies, for example single crochet or a stitch pattern from the design.
- Make it bigger than 4 in (10 cm): at least 6 in (15 cm) wide and tall. The edges of a swatch are distorted, so you’ll measure only the middle.
- Work as you normally would. Don’t try to crochet “nicely”; relaxed tension is what the project will have.
- Wash or block the swatch the same way you’ll treat the finished item, and let it dry. Many yarns change size when washed.
How to measure gauge
- Lay the swatch flat without stretching it.
- Place a ruler or gauge tool in the middle of the swatch, away from the edges.
- Count stitches across 4 in (10 cm), including half stitches. Half a stitch matters: at around 16 sts per 4 in, being half a stitch off changes a 40 in (100 cm) wide blanket by more than an inch (about 3 cm).
- Count rows over 4 in (10 cm) vertically.
- Measure in two or three places and average the results.
Enter your stitch and row counts into the calculator along with the pattern’s gauge.
Tip: If counting individual stitches is tricky, measure a whole number of stitches instead, say 15 stitches, and enter that width. The calculator can convert it to stitches per 4 in / 10 cm.
Adjusting your hook size
| Your swatch has… | Your stitches are… | Try… |
|---|---|---|
| More stitches than the pattern | too small | a larger hook |
| Fewer stitches than the pattern | too big | a smaller hook |
| Same stitches, different rows | right width, different height | usually keep the hook; adjust length by adding or removing rows |
Change one hook size at a time, make a new swatch, and measure again. Stitch gauge (width) usually matters more than row gauge, because many patterns tell you to work “until piece measures” a certain length.
Using the calculator for your own projects
The calculator can also answer practical questions:
- How many stitches do I need for a given width? Multiply your gauge per inch (or per cm) by the width you want. Example: 16 sts per 4 in is 4 sts per inch. For a 20 in scarf width, you need 4 × 20 = 80 stitches.
- How big will this pattern come out at my gauge? Divide the pattern’s stitch count by your stitches per inch. A pattern with 80 stitches worked at 3.5 sts per inch comes out about 22.9 in wide, not 20 in.
- How many chains do I start with? Add the turning chain allowance: for rows of single crochet, chain the number of stitches plus 1 (you’ll work into the 2nd ch from the hook). For double crochet, it depends on whether the turning chain counts as a stitch; follow your pattern.
- Stitch multiples: If your stitch pattern repeats over a set number of stitches (for example “multiple of 4 + 2”), round your result to the nearest number that fits.
When gauge matters and when it doesn’t
- Matters a lot: garments, hats, socks, gloves, anything that must fit. Also blankets if you’re short on yarn, because a looser gauge uses more yarn.
- Matters less: dishcloths, scarves, coasters, many amigurumi (though dense gauge is important there for a different reason: so stuffing doesn’t show).
Common mistakes
- Swatching too small. A 4 in swatch has distorted edges inside your measuring area. Go bigger.
- Skipping the wash. Cotton and some wools change size after their first wash.
- Measuring at the edge. Always measure in the middle.
- Stretching the swatch while measuring. Let it lie naturally.
- Changing hooks between swatch and project, even to the “same” size from another brand.
FAQ
Is gauge the same as tension?
Yes. “Gauge” is the US term; “tension” is the UK term.
What if I match stitch gauge but not row gauge?
That’s very common. Keep the hook that matches stitch gauge, and adjust the length by working more or fewer rows. For patterns with shaping over a set number of rows, recalculate where the shaping falls.
How many sizes should I change my hook by?
Start with one size (about 0.5 mm) and swatch again. Large differences may mean a different yarn weight is a better choice.
Does gauge matter for amigurumi?
Exact numbers rarely matter, but the fabric should be dense. Most amigurumi uses a hook smaller than the yarn label suggests.