Granny Square Size Calculator
Estimate granny square size by round count, find how many rounds to reach a target size, and plan your blanket layout.
Size by Round Count
Typical: 0.5–1" per round depending on yarn weight
Rounds for Target Size
Blanket Layout Calculator
How to Use
- Use Size by Round Count to see how large your square will be after each round.
- Use Rounds for Target Size to find how many rounds give you the size you want.
- Use Blanket Layout to find how many squares fit in a given blanket size.
Typical Granny Square Sizes by Yarn Weight
| Yarn Weight | Per Round Growth | 5-Round Square | 8-Round Square |
|---|---|---|---|
| Fingering | ~0.4–0.5" | ~2–2.5" | ~3.5–4" |
| Sport / DK | ~0.5–0.65" | ~2.5–3.5" | ~4.5–5.5" |
| Worsted | ~0.65–0.85" | ~3.5–4.5" | ~5.5–7" |
| Bulky | ~0.9–1.2" | ~5–6" | ~8–10" |
Common Uses
- Granny square blankets and afghans
- Patchwork bags and totes
- Pillow covers and cushions
- Colorwork sampler projects
Results are estimates. Actual results vary by gauge, tension, yarn, and hook size.
About this Granny Square Size Calculator
Use this free Granny Square Size Calculator to get quick, accurate results directly in your browser. It is designed for everyday use with no signup, no downloads, and no account required. No signup is required, and the tool works on phones, tablets, and desktop browsers.