Bias Tape Length Calculator
Bias tape is cut on the diagonal so it bends around curves. This estimates how much tape a square of fabric gives, for the strip width you choose.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The strips are cut diagonally across the square. The total length of strip is the square's area divided by the strip width.
Take off a waste allowance for the ends and seams. The percent you choose sets that part aside.
Worked example
A square 18 in on each side, cut into strips 2.5 in wide, gives about 3.2 yd of bias tape, with 10% set aside.
Questions
What strip width should I cut?
Cut the width your pattern or tape instructions give. Wider strips fold to a wider tape.
Why is the real length a little less?
Triangles at the ends of each strip are lost, and seams take some length. The waste allowance covers that.
Why cut bias at all?
Bias-cut fabric stretches and bends around curves, which is why tape is cut on the diagonal.
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