How it works
After you swatch in your stitch pattern, measure stitches and rows per 4 inches. The calculator scales those rates to your blanket size.
Worked example
36×40" blanket at 12 sts / 14 rows per 4": 108 stitches across, starting chain 109, 140 rows.
Tips
For granny squares, plan motif count instead of a single starting chain. Add border rows separately.
Common mistakes
Using ball-band gauge instead of your stitch pattern; chaining too tightly.
Stitch patterns and borders
Single crochet, half double, and granny-based patterns have different stitches-per-inch even at the same hook size. Always swatch the stitch you will use. Borders can add 1–4" per side—either include them in the target size or add rows afterward. Join-as-you-go motifs need a motif count plan instead of one long foundation chain.
Limits and how to use the results
Estimates run only in your browser. Prefer a published pattern’s tested yardage when it conflicts with this planner. Density factors and assumptions are documented on the methodology page; legal terms cover planning-use limits.
FAQ
How many chains for a crochet blanket?
Chains ≈ stitches across + turning chain. Get stitches across from width and gauge with this tool.
What size is a baby blanket?
Common crochet baby blankets are about 30×36" to 36×52".