Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Sewing
Fabric Gathering Calculator
Compute the flat cut length of fabric needed to gather down to a target finished length, using a chosen gather ratio. Useful for ruffles, gathered skirts, curtain headers, and shirring projects.
Fill in the required fields to see your result.
Sewing
Hem Allowance Calculator
Compute the total fabric cut length needed for a garment with a chosen hem depth and a top seam allowance, so the finished length matches the design. Useful for skirts, trousers, curtains, and any project where precise length matters.
Fill in the required fields to see your result.
Key differences
| Fabric Gathering Calculator | Hem Allowance Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 2 | 3 |
| Result | Fabric Length Needed (inches) | Total Cutting Length (inches) |
| What it does | Compute the flat cut length of fabric needed to gather down to a target finished length, using a chosen gather ratio. Useful for ruffles, gathered skirts, curtain headers, and shirring projects. | Compute the total fabric cut length needed for a garment with a chosen hem depth and a top seam allowance, so the finished length matches the design. Useful for skirts, trousers, curtains, and any project where precise length matters. |