Granny Square Blanket Calculator
How many granny squares do you need? Pick a blanket size and square size, and get the layout, the finished size and the yarn to buy.
How many granny squares for a blanket?
Number of squares (across × down) for common blanket sizes, rounded to the closest fit, without a border.
| Blanket | 4 in squares | 5 in | 6 in | 8 in | 12 in |
|---|---|---|---|---|---|
| Baby 30 × 35 in | 72 (8 × 9) | 42 (6 × 7) | 30 (5 × 6) | 16 (4 × 4) | 9 (3 × 3) |
| Receiving 40 × 40 in | 100 (10 × 10) | 64 (8 × 8) | 49 (7 × 7) | 25 (5 × 5) | 9 (3 × 3) |
| Lapghan 36 × 48 in | 108 (9 × 12) | 70 (7 × 10) | 48 (6 × 8) | 30 (5 × 6) | 12 (3 × 4) |
| Throw 50 × 60 in | 195 (13 × 15) | 120 (10 × 12) | 80 (8 × 10) | 48 (6 × 8) | 20 (4 × 5) |
| Twin 66 × 90 in | 391 (17 × 23) | 234 (13 × 18) | 165 (11 × 15) | 88 (8 × 11) | 48 (6 × 8) |
| Full 80 × 90 in | 460 (20 × 23) | 288 (16 × 18) | 195 (13 × 15) | 110 (10 × 11) | 56 (7 × 8) |
| Queen 90 × 100 in | 575 (23 × 25) | 360 (18 × 20) | 255 (15 × 17) | 143 (11 × 13) | 64 (8 × 8) |
| King 108 × 100 in | 675 (27 × 25) | 440 (22 × 20) | 306 (18 × 17) | 182 (14 × 13) | 72 (9 × 8) |
How the calculator works
It divides the blanket size (minus the border) by the size of one square, then rounds to whole squares the way you choose. The yarn estimate uses typical yardage for your yarn weight, adds about 8% for joining the squares and a denser estimate for the border.
For the most accurate yarn figure, weigh your first finished square, multiply by the number of squares, and compare it with the grams on your yarn label.
Tips for granny square blankets
- Block your squares to the same size before joining; small differences add up across a row.
- Joining with a slip stitch or join-as-you-go uses less yarn than a single crochet seam.
- A border is the easiest way to fine-tune the final size.
- Using many colours? Each colour needs its own share: divide the total by the number of colours as a starting point.
Frequently asked questions
How many granny squares do I need for a throw blanket?
For a 50 × 60 inch throw: about 80 squares of 6 inches (8 × 10), 120 squares of 5 inches, or 48 squares of 8 inches.
How much yarn does one granny square take?
A 6-inch square in worsted yarn takes roughly 20–25 yards. Weigh your first finished square for an exact figure.
How do I make the blanket bigger without more squares?
Add a wider border. A 3-inch border adds 6 inches to both the width and the length.