Quick Answer
A crochet blanket yarn calculator estimates how much yarn you need from your blanket size and yarn weight: it multiplies the blanket's area by a typical yards-per-area figure for that weight and stitch, then adds a safety buffer. Pick a size and your yarn weight to get the total yards, meters and number of balls to buy.
The Crochet Blanket Yarn Formula
To work out how much yarn for a crochet blanket, this calculator uses two things you already know — the blanket’s size and your yarn’s weight. It multiplies the blanket area by a typical yards-per-area figure for that yarn weight and stitch, then adds a small safety buffer so you don’t run short. A 50 × 60 in (127 × 152 cm) throw in worsted-weight double crochet, for example, comes out to about 1,900 yd (1,740 m) — roughly 10 standard balls.
Thicker yarn and airy stitches need fewer yards; a dense stitch like single crochet needs more.
| Blanket size | Imperial (W × L) | Metric (W × L) | Est. worsted yarn | Balls (~200 yd) |
|---|---|---|---|---|
| Baby / receiving | 30 × 40 in | 76 × 102 cm | ≈ 775 yd / 700 m | 4 |
| Lapghan | 36 × 48 in | 91 × 122 cm | ≈ 1,100 yd / 1,000 m | 6 |
| Throw / afghan | 50 × 60 in | 127 × 152 cm | ≈ 1,900 yd / 1,740 m | 10 |
| Twin bed | 66 × 90 in | 168 × 229 cm | ≈ 3,775 yd / 3,440 m | 19 |
| Queen | 90 × 90 in | 229 × 229 cm | ≈ 5,125 yd / 4,690 m | 26 |
Estimates for worsted (4) yarn in double crochet with a 15% buffer — the calculator above adjusts instantly for other weights, stitches and sizes. Yardages are calibrated to published blanket charts (see sources).
How to Use the Crochet Blanket Yarn Calculator
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Pick your blanket size
Choose a preset like Baby, Throw or Twin, or type your own width and length and tap Inches or Centimetres.
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Pick your yarn weight
Find the number on your yarn label (0 to 7) and choose it — Worsted (4) is the most common blanket yarn.
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Read your total
See the estimated yards, meters and balls to buy. Open More options to fine-tune the stitch, ball size or safety buffer.
