Granny Square Blanket Calculator
Plan your next crochet blanket in seconds — see exactly how many granny squares you need and roughly how much yarn to buy.
📖 How it works & FAQPlan a granny square blanket without the guesswork
Every crochet blanket starts with the same two questions: how big do I want it, and how many squares will that take? This calculator answers both instantly. Enter the finished size of a single granny square (measure one you have already made, blocked if possible) and the width and height you want the blanket to be. It lays the squares out in a tidy grid, rounds to whole squares, and multiplies across by down to give you a total count.
How the yarn estimate works
The yarn figure is a planning ballpark, not a guarantee. It assumes worsted-weight yarn and roughly 0.6 yards of yarn per square inch of finished square, then divides by 220 yards per skein. Your real usage depends on hook size, tension, stitch pattern, number of rounds, and how many colors you carry. Buy an extra skein or two of your main color so you do not run short mid-project or get stuck dye-lot hunting. These numbers are estimates for planning only, not a substitute for a tested pattern or gauge swatch.
How to use it
- Crochet and measure one finished square, then enter its size in inches.
- Type your target blanket width and height (a lapghan is about 36×48, a throw about 50×60).
- Watch the grid preview redraw so you can picture the layout.
- Read the total squares, the across × down count, and the yarn estimate.
- Adjust the square size or dimensions until the finished measurements look right.
FAQ
- Should I count the border in my square size?
- Measure the square as it will sit joined to its neighbors. If you join with a seam that adds width, include that so the finished blanket lands on target.
- Why does the finished size differ from what I typed?
- Squares only come in whole units, so the tool rounds to the nearest whole square. The "= in wide/tall" note shows the true finished size after rounding.
- How much extra yarn should I buy?
- Add about 10–20% for joining, the border, and gauge differences. Buying one spare skein of each color is cheap insurance against dye-lot mismatches.
- Can I use this for other joined-square projects?
- Yes. Any motif that finishes to a consistent square — solid squares, sunburst grannies, or C2C blocks — works the same way.