Seam Allowance Calculator
Convert between cut sizes and finished sizes with different seam allowances.
Conversion Mode
Cut Size
Seam Allowance
Quick Reference: Squares
| Finished | Cut (1/4" seam) | Cut (1/2" seam) |
|---|---|---|
| 2" | 2.5" | 3" |
| 2.5" | 3" | 3.5" |
| 3" | 3.5" | 4" |
| 3.5" | 4" | 4.5" |
| 4" | 4.5" | 5" |
| 4.5" | 5" | 5.5" |
| 5" | 5.5" | 6" |
| 6" | 6.5" | 7" |
Seam Allowance Tips
- • Standard quilting seam allowance is 1/4"
- • Garment sewing typically uses 5/8"
- • A scant 1/4" accounts for the fold when pressing
- • Test your seam allowance with a scrap before cutting
- • Use a 1/4" presser foot for consistent seams
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