Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Sewing
Elastic Length Calculator
Compute the cut length of elastic for a waistband, cuff, or casing so it grips comfortably without cutting in or sliding. Useful for any garment with an elastic-pull-on closure: PJ pants, leggings, gathered skirts, sleeve cuffs.
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
| Elastic Length Calculator | Seam Allowance Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 3 | 3 |
| Result | Elastic Length Needed (inches) | Total Fabric Area (square inches) |
| What it does | Compute the cut length of elastic for a waistband, cuff, or casing so it grips comfortably without cutting in or sliding. Useful for any garment with an elastic-pull-on closure: PJ pants, leggings, gathered skirts, sleeve cuffs. | 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. |