Sewing calculator
Seam and Hem Allowance Calculator
Turn finished dimensions into cut dimensions with independent edge allowances.
Your measurements
Seam and hem result
- Cut width
- 43.00 in
- Cut height
- 43.00 in
Formula
Cut width equals finished width plus left and right allowances; cut height adds top and bottom allowances.
Assumptions
- Allowances are measured perpendicular to each edge.
When a tested commercial pattern gives different cutting dimensions or layout instructions, follow that pattern.
Worked example
- 40 × 40 in finished square
- 1.5 in on each edge
The required cut size is 43 × 43 inches.
Verification note
Confirm whether the source measurement is a finished line or an existing cut line before adding anything.