About Craft Math Calculators

Last updated June 5, 2026

Between quilting, knitting, and cross-stitch, “how much do I need?” is the eternal question. I built the yardage, binding, gauge, yarn, and fabric-size math I rely on — all of it shown, none of it guessed.

What’s on this site

Right now there are 6 calculators here: Fabric Yardage Calculator, Quilt Binding Calculator, Knitting Gauge Calculator, Knitting Yarn Calculator, Cross Stitch Fabric Calculator, and Quilt Backing Calculator. Each one is a single-purpose tool that shows its formula, lists its assumptions, and runs on any device with no signup.

Why these are different

A lot of calculators are black boxes — you get a number and no way to tell if it’s right. These work the other way around: the formula, the constants, and a worked example sit on the page next to the result, so you can redo the math by hand. No account, no paywall, no signup.

How the math is kept honest

Each formula is shown in full and was independently re-derived and spot-checked against the calculator’s code. Reference values (typical rates, averages, rules of thumb) are labeled as approximate and are editable, so you can put in your own real numbers. These are material estimates, not project instructions — gauge, fabric width, and pattern specifics vary, so make a swatch and double-check before you cut.

Found a mistake?

I’d genuinely like to know. Email [email protected] and I’ll fix it.