Seam Allowance Calculator
Calculate total fabric needed when adding seam allowances to pattern pieces.
Adjusted Measurements
Seam allowance is extra fabric added around pattern edges for stitching.
Standard seam allowances:
- 5/8 inch (1.6 cm) — US standard commercial patterns
- 1/2 inch (1.3 cm) — common for home sewing
- 3/8 inch (1 cm) — common in European patterns
- 1/4 inch (0.6 cm) — used for curves, collars, facings
- 1 inch (2.5 cm) — used for hems
Cut Size = Finished Size + (2 × Seam Allowance) for each dimension.
Both inches and centimeters are shown in results.