Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
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.
Sewing
Pattern Grading Calculator
Calculates new pattern measurements when grading a sewing pattern up or down between sizes. Use it when resizing a commercial pattern to fit a different size without redrawing every piece from scratch.
Fill in the required fields to see your result.
Key differences
| Seam Allowance Calculator | Pattern Grading Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 3 | 4 |
| Result | Total Fabric Area (square inches) | Adjusted Measurement (inches) |
| What it does | 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. | Calculates new pattern measurements when grading a sewing pattern up or down between sizes. Use it when resizing a commercial pattern to fit a different size without redrawing every piece from scratch. |