An interactive calculator and proportional cutting diagram for making continuous bias tape from a rectangular piece of fabric. Adjust the fabric dimensions or your required tape length—everything recalculates dynamically.
| Rectangle Height (a) Vertical side of the fabric piece | cm | |
| Rectangle Width (b) Horizontal side of the fabric piece | cm | |
| Bias Strip Width (w) Perpendicular cut width of each strip | cm | |
| Seam Allowance (s) Per edge on both the vertical seam and the top/bottom tube seam | cm | |
| Total Bias Tape Length (L) Net usable length after both seams | m |
Cutting & Tube Parallelogram Layout (proportional)
Whole 45° bias strips
Top/bottom tube seam (s each)
Pressed vertical seam (2s)
Cut 45° corner (sewn to right edge)
Trimmed remainder (narrower than one strip)
| Measurement | Value |
|---|---|