Crochet Blanket Size Calculator
Multiply the target width by your stitches per inch to get the starting chain, the length by your rows per inch to get the row count, and the area by a crochet yardage factor to estimate the yarn. This crochet blanket size calculator runs all three from your gauge swatch, includes the standard blanket size chart from lovey to king, and rounds the skein count up so you never join a new dye lot in the last border round.
Start with
Add the turning chain for your stitch (dc +3, hdc +2, sc +1) to the chain count. Chain a few extra and rip back to the exact width after row one — counting 175 chains twice is the tax.
▸How this was worked out
gauge = 14 sts ÷ 4 = 3.5 sts/in · 8 rows ÷ 4 = 2 rows/in
starting chain = 50″ × 3.5 = 175
rows = 60″ × 2 = 120
yarn = 3,000 in² × 0.70 yd/in² (Worsted / aran (4), crochet) × 1 = 2,100 yd
skeins = 2,100 ÷ 220 = 9.55 → 10
Round chains and rows to the nearest whole; round skeins UP. Crochet eats ~25% more yarn than knitting at the same gauge — the per-inch table here is crochet-specific.
Shopping list
- Worsted / aran (4) yarn2,100 yd total, one dye lot10 × 220 yd
CraftCalc · Crochet blanket plan
Throw / afghan: 50 × 60″ in Worsted / aran (4), gauge 14 sts × 8 rows per 4″
Chain 175 (+turning ch) · work 120 rows · buy 10 skeins (2,100 yd)
craftcalc.io — free maker calculators with the arithmetic shown
Standard crochet blanket sizes
The sizes the calculator’s dropdown uses — typical finished dimensions, not mattress dimensions. Bed blankets include drape over the sides; adjust to taste (many crocheters take 6–12 inches off a bedspread width for a top-of-mattress throw).
| Size | Width | Length | Notes |
|---|---|---|---|
| Lovey / security | 12″ | 12″ | Baby comfort square |
| Baby | 30″ | 40″ | Crib-friendly, stroller size |
| Receiving / swaddle | 40″ | 40″ | Newborn receiving square |
| Crib | 45″ | 60″ | Standard crib blanket |
| Throw / afghan | 50″ | 60″ | Sofa lap blanket |
| Twin | 66″ | 90″ | 39 × 75″ mattress with drape |
| Full / double | 80″ | 90″ | 54 × 75″ mattress with drape |
| Queen | 90″ | 100″ | 60 × 80″ mattress with drape |
| King | 108″ | 100″ | 76 × 80″ mattress with drape |
How do you turn gauge into a starting chain?
Starting chain = target width × stitches per inch — plus the turning chain your stitch needs (3 for double crochet, 2 for half-double, 1 for single). Gauge comes from a blocked swatch at least 6 inches square, measured over the middle 4 inches: 14 dc over 4 inches is 3.5 sts/in, so a 50-inch throw starts with 175 chains plus 3. Rows work the same way against row gauge: 8 rows over 4 inches is 2 rows/in, and 60 inches of length is 120 rows.
The yarn estimate is area-based and crochet-specific: crochet fabric consumes roughly 25% more yarn than knitting at the same gauge — more loops, taller stitches, more yarn per square inch. A worsted-weight blanket runs about 0.7 yards per square inch in standard stitches; granny squares and openwork run ~15% less, dense single-crochet or waistcoat stitch ~15% more.
Worked example: a 50 × 60 inch throw in worsted dc
Gauge: 14 dc and 8 rows over 4 inches on a 5 mm hook — 3.5 sts/in, 2 rows/in. Throw size 50 × 60. Starting chain: 50 × 3.5 = 175, plus 3 turning chains. Rows: 60 × 2 = 120 rows. Area: 3,000 in² × 0.7 yd/in² = 2,100 yards of worsted — at 220 yards a skein that is 9.5, so buy 10 skeins. The tenth skein covers the border and the inevitable tension drift; nine and a half is how you end up frogging a border in a discontinued color.
Chain discipline: work the first row into the chains, then lay the piece flat and measure. Too wide? Rip back — chains are free. Too narrow, add a few. Getting row one exactly right is cheaper than discovering at row 120 that the throw is 46 inches wide.
Frequently asked questions
How many chains for a baby blanket?
At typical worsted dc gauge (3.5 sts/in), a 30 × 40 inch baby blanket starts with 30 × 3.5 = 105 chains plus 3 turning chains, worked for 40 × 2 = 80 rows. Use your own swatch gauge — at 4 sts/in the same blanket wants 120 chains.
Why is my blanket getting wider (or narrower) as I go?
You are gaining or losing a stitch per row — almost always at the turning chain, which is easy to miss on the way back. Count stitches every few rows, use a stitch marker in the last stitch, and decide consistently whether the turning chain counts as a stitch (the pattern should say).
How much yarn does a throw blanket take?
A 50 × 60 inch throw in worsted needs roughly 1,800–2,200 yards depending on stitch density; chunky takes fewer yards but heavier skeins; granny-square designs run lighter (~1,600). This calculator's estimate is within ~15% — buy the rounded-up number in one dye lot.
Do I measure gauge in the pattern stitch or plain dc?
The pattern stitch. Stitch patterns have very different densities — a wattle stitch is wider and shorter than plain dc at the same hook size. Swatch in the actual stitch, blocked the way the blanket will be blocked.
Can I resize any blanket pattern?
If it is worked in an untextured repeat: chain to your target width (a multiple of the pattern repeat), work to length, and scale the yardage by the area ratio. Textured patterns with fixed repeats resize in jumps of one repeat — the calculator's chain count tells you the nearest one.
Formulas and standard tables are sourced in the methodology. Results are estimates — measure twice, cut once.