Knitting & crochet calculator
Granny Square Blanket Calculator
Enter your blanket size and granny square size to calculate the square layout, total number of squares, finished dimensions, and optional yarn estimate.
A granny square blanket is a grid problem: divide the blanket width and height by the finished size of one square, then round up so the layout uses full squares. Rounding up is usually better than cutting the blanket short.
This calculator gives the number of squares across and down, the total squares to make, and the finished layout size. If you know the yardage for one square, it also estimates total yardage and an even per-color amount.
Worked example: a 48 x 60 inch blanket made from 6-inch squares needs 8 squares across and 10 squares down, for 80 squares total. If each square uses 12 yards, the blanket uses about 960 yards before joining and border yarn.
Frequently Asked Questions
Should I round up or down when planning granny squares?
Round up if you want the blanket to meet or exceed the target size. Round down only if a slightly smaller blanket is acceptable or if you plan to add a wide border.
Does this include joining and border yarn?
The yarn estimate covers only the squares unless you include joining and border yarn in your yardage-per-square estimate. Add an extra buffer for seaming, joining, and borders.
Should I measure squares before or after blocking?
Use blocked square size if you plan to block the blanket or squares. Blocking can change the finished layout size enough to alter the number of squares needed.
How do I estimate yardage per square?
Make one sample square, weigh or measure the yarn used, and use that as the yardage per square. For multi-color squares, average across a few samples if possible.