Knitting Gauge Calculator
Swatch once, then let the math do the boring part — stitches and rows per inch, cast-on counts, and pattern fixes when your gauge doesn't match.
1 · Measure your swatch
2 · Your gauge
Stitches / in
4.57
per inch
Stitches / cm
1.8
per cm
Rows / in
7.11
per inch
Rows / cm
2.8
per cm
= 18.3 sts × 28.4 rows per 4 in · 18 sts × 28 rows per 10 cm
3 · Cast-on & row counts
Cast on
72 sts
for 40 cm wide · round to your stitch repeat
Work
140 rows
for 50 cm tall
4 · Pattern says one gauge, you get another
Enter the pattern's gauge (per 10 cm) — yours comes from the swatch above.
Scale factor (pattern ÷ yours)
× 1.222
pattern 22 sts vs your 18 sts per 10 cm — you knit looser, so the piece would come out 22% too big at pattern counts
You cast on instead
82 sts
You work instead
60 rows
All math runs in your browser from the numbers you enter — nothing is uploaded. Swatches lie unless they're blocked: wash and dry yours the way you'll treat the finished piece. 💕
Keep planning: how much yarn you'll need · hook & needle sizes · crochet version · turn a photo into a chart
Every knitting pattern is written for one specific gauge, and the odds yours matches it exactly are roughly zero. This knitting stitch calculator turns your swatch into the numbers that actually matter: stitches and rows per inch (or per cm), the cast-on count for any width you want, and the corrected stitch count when the pattern's gauge and yours disagree.
Enter what you measured — stitches across, rows up, width, height — and everything else computes live. The gauge mismatch tool is the one that saves sweaters: pattern says 22 sts per 4 inches, you get 24, and it hands you the scale factor (×0.917) plus the adjusted counts, before you've knit a single row of the real thing.
What you get
Swatch-first, not form-first
Your stitch and row counts sit right on the swatch diagram, with a 10 cm / 4 in badge — it reads like the swatch in your lap, not a tax form.
Gauge in both unit systems
Stitches and rows per inch and per cm, side by side, with a cm/in toggle that converts your swatch measurements for you.
Cast-on counts for any width
Target a width, get the stitch count. Target a height, get the row count. Rounded, with a nudge to respect your stitch repeat.
Gauge mismatch fixer
Pattern gauge vs. your gauge → scale factor and adjusted stitch and row counts. The difference between a sweater that fits and a very expensive scarf.
Yarn-weight reality check
Typical gauge ranges for fingering through bulky — a gentle note when your swatch lands outside them, not a lecture.
Free, private, no sign-up
All math runs in your browser. Your gauge secrets stay on your device.
How to calculate knitting gauge
Knit and block a swatch
Cast on about 30 stitches and knit a square at least 10 cm / 4 in across, in the pattern stitch. Block it the way you'll treat the finished piece — unblocked swatches lie.
Count and measure
Count stitches across and rows up, then measure the width and height they cover. Enter the four numbers on the swatch above and read your gauge per inch and per cm.
Size your project or fix the pattern
Use the sizing tool for cast-on and row counts from any target size — or enter the pattern's gauge next to yours and take the adjusted counts instead.
Gauge math by calculator vs. by wishful thinking
| Gauge calculator | Trusting the ball band | |
|---|---|---|
| Where the numbers come from | Your blocked swatch, in your hands, with your yarn | A label average that assumes a knitter who isn't you |
| When gauge is off | Scale factor and corrected counts, computed before you start | You find out at row 60, in front of the mirror |
| Sizing a custom width | Target width → exact cast-on, in either unit system | Squinting at the schematic and hoping |
| Row gauge | Counted and converted too — sleeves and raglans depend on it | Usually ignored until the armhole is in the wrong place |
Frequently asked questions
What is gauge in knitting?
Gauge (or tension) is how many stitches and rows of your knitting fit into a set distance — usually stated as "22 sts and 28 rows = 4 inches in stockinette". It's the pattern's unit of measurement: every width and length in the pattern assumes you knit at that density. If your gauge differs, every measurement in the pattern is off for you.
How do I adjust a pattern if my gauge is different?
Divide the pattern's gauge by yours to get a scale factor — pattern 22 sts per 4 in and yours 24 gives ×0.917. To keep the pattern's finished size, multiply each stitch count by the inverse (your gauge ÷ pattern gauge): 100 pattern stitches becomes 109 at your gauge. The fixer above does both directions. If the adjusted counts land between sizes, many knitters simply follow the instructions for a different size instead.
How do I measure a gauge swatch correctly?
Knit a square at least 10 cm / 4 in across — bigger is better, because edge stitches are distorted. Block it exactly as you'll treat the finished garment, let it dry fully, then lay it flat and count stitches and rows across the middle, away from the edges. Measure the distance those counted stitches cover, not the whole swatch.
How many stitches do I cast on for a scarf or blanket?
Multiply your stitches-per-inch by the target width in inches. At 5.5 sts per inch, a 40-inch baby blanket needs about 220 stitches; a 7-inch scarf needs about 38. Use the sizing tool above — it does the multiplication and reminds you to round to your stitch pattern's repeat.
What is a typical gauge for worsted weight yarn?
Worsted usually knits up at 16–20 stitches per 4 inches on 4.5–5.5 mm needles. DK runs 21–24, sport 23–26, fingering 27–32, and bulky 12–15. Treat these as ballpark ranges, not targets — your tension decides the real number, which is why the swatch comes first.
Does blocking really change gauge?
Yes — dramatically for some fibers. Wool can grow 10% or more when wet-blocked; cotton stretches lengthwise; superwash grows the most. A swatch measured before blocking tells you almost nothing about the finished garment, which is why every "my sweater grew" horror story starts with an unblocked swatch.