Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Sewing
Seam Allowance Fabric Calculator
Calculate how much extra fabric you need when changing the seam allowance from what a pattern specifies. Essential when adapting European (1 cm) patterns to US (5/8 inch) standards, or vice versa.
Fill in the required fields to see your result.
Sewing
Seam Allowance Calculator
Calculate the total cut fabric area needed when adding seam allowances to a target finished size. Use it when drafting patterns, adjusting existing patterns, or estimating fabric for projects where the seam allowance reduces the finished dimensions.
Fill in the required fields to see your result.
Key differences
| Seam Allowance Fabric Calculator | Seam Allowance Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 4 | 3 |
| Result | Adjusted Fabric Needed (yards) | Total Fabric Area (square inches) |
| What it does | Calculate how much extra fabric you need when changing the seam allowance from what a pattern specifies. Essential when adapting European (1 cm) patterns to US (5/8 inch) standards, or vice versa. | Calculate the total cut fabric area needed when adding seam allowances to a target finished size. Use it when drafting patterns, adjusting existing patterns, or estimating fabric for projects where the seam allowance reduces the finished dimensions. |