About QuiltMath

QuiltMath is a set of free calculators for quilters. It handles the arithmetic that's easy to get wrong late at night at the cutting table: the 7/8" for half-square triangles, how many width-of-fabric strips you need, and how much backing to buy.

Each calculator explains the method it uses, so you can check the math and adapt it to your own way of piecing. Everything runs in your browser; nothing you type is sent anywhere.

Spotted a mistake or want a calculator for a unit we don't cover yet? Suggestions are welcome.