Crochet Blanket Size Calculator
Pick a target size, enter your gauge, and get your starting chain, stitch and row counts. Add a measured swatch and it also tells you how much yarn to buy — scaled from what your hands actually produce, not a generic table.
＋ Yarn estimate from a swatch (optional, most accurate)
Common blanket sizes
| Blanket | Inches | Centimeters |
|---|---|---|
| Lovey | 12 × 12 | 30 × 30 |
| Baby | 30 × 36 | 76 × 91 |
| Throw | 50 × 60 | 127 × 152 |
| Twin | 66 × 90 | 168 × 229 |
| Queen | 90 × 100 | 229 × 254 |
| King | 108 × 100 | 274 × 254 |
Published charts disagree by a few inches — these are common midpoints, not rules. Blankets also relax an inch or two after washing and use.
Why the swatch method beats yarn tables
“How much yarn do I need for a blanket” has no honest one-number answer: a tight single crochet drinks far more yarn than an airy granny stitch at the same size, and tension varies between hands. Generic tables spread over a range as wide as 1200–1800 yards for the same throw.
The swatch method sidesteps all of it: make a swatch in your yarn, your stitch, your tension; measure what it used (unravel it and measure, or weigh it and convert by the ball band); the calculator scales by area and adds a 10% buffer for seaming and gauge drift. Ten minutes of swatching converts a guess into a number you can shop with.
Starting chain math, for reference: width ÷ 4 × stitch gauge, plus one turning chain for single crochet — taller stitches need two or three turning chains, and the calculator’s stitch count still applies.
FAQ
How many chains do I start with?
Width ÷ 4 × stitch gauge (per 4 in) + 1 turning chain for sc. A 40-inch blanket at 16 sts/4in → 160 sts → chain 161.
How much yarn do I need?
Use the swatch box above — it scales your real usage by area with a 10% buffer. Tables can only give wide ranges.
What are standard blanket sizes?
See the table above: lovey 12×12 in through king 108×100 in. Sources vary by a few inches.
Can I work in centimeters?
Enter cm everywhere and read gauge per 10 cm — the ratios are what matter. (A dedicated cm toggle is coming.)