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
Fabric Gathering Ratio Calculator
Calculate the pre-gathered fabric length needed to achieve the right fullness for ruffles, skirt hems, and sleeves. Accounts for gathering ratio, fabric drape, and hem allowances.
Fill in the required fields to see your result.
Key differences
| Seam Allowance Fabric Calculator | Fabric Gathering Ratio Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 4 | 4 |
| Result | Adjusted Fabric Needed (yards) | Fabric Length to Cut (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 pre-gathered fabric length needed to achieve the right fullness for ruffles, skirt hems, and sleeves. Accounts for gathering ratio, fabric drape, and hem allowances. |