Seam Allowance Calculator

Calculate adjusted cut dimensions by adding seam allowances to your pattern pieces.

Results

Visualization

How It Works

Seam allowance is the fabric between the stitch line and the cut edge. The standard seam allowance is 5/8 inch (1.6 cm) for most commercial patterns, but many indie patterns use 3/8 inch or 1/2 inch. Fold edges (like center front on a symmetrical bodice) do not get seam allowance. Always check your pattern instructions for the specified seam allowance.