About SewMath

SewMath is a small collection of free sewing and quilting calculators built around one idea: fabric math deserves instant, accurate answers — not a scroll through a 2,000-word blog post to find a chart.

Each tool does one job. The fabric yardage calculator tells you how many yards to buy from your piece size and count; the quilt backing and binding calculators cover the two things every quilt needs at the end; and the curtain fabric calculator handles fullness, multiple widths, and pattern repeats. The rules of thumb behind every tool are shown on its page, so you can check the math yourself.

All calculations run entirely in your browser — nothing you type is sent to a server or stored by us.

Spotted an error, or want a calculator we don't have yet? We'd genuinely like to know. This site improves through feedback from people mid-project.