Sewing calculator
Seam Allowance Calculator
Add seam allowance to finished pattern-piece dimensions and get the cut size instantly.
Enter your finished dimensions and seam allowance.
This version adds the same allowance to all four edges. Hems, zippers and specialist seams may require different allowances.
How this is calculated
Cut width = finished width + twice the seam allowance. Cut height = finished height + twice the seam allowance.