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 Scaling Calculator
Compute scaled pattern dimensions when you need to enlarge or reduce a sewing pattern by a percentage. Useful for grading between sizes, copying patterns at non-standard scale, or fitting a pattern to non-standard body proportions.
Fill in the required fields to see your result.
Key differences
| Seam Allowance Calculator | Pattern Scaling Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 3 | 2 |
| Result | Total Fabric Area (square inches) | New Pattern Dimension (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. | Compute scaled pattern dimensions when you need to enlarge or reduce a sewing pattern by a percentage. Useful for grading between sizes, copying patterns at non-standard scale, or fitting a pattern to non-standard body proportions. |