Sewing reference
Seam Allowance Converter
Convert seam allowances between inches, centimetres, and millimetres. Enter a value in any unit for an instant conversion, or use the table below for the sizes you'll cut most.
1 inch = 25.4 mm exactly, 1 cm = 10 mm.
Result
5/8"
15.9 mm · 1.59 cm
| Inches | mm | cm |
|---|---|---|
| 1/4" | 6.3 | 0.64 |
| 3/8" | 9.5 | 0.95 |
| 1 cm | 10.0 | 1.00 |
| 1/2" | 12.7 | 1.27 |
| 1.5 cm | 15.0 | 1.50 |
| 5/8" | 15.9 | 1.59 |
| 3/4" | 19.0 | 1.90 |
| 1" | 25.4 | 2.54 |