Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Sewing
Zipper Length Calculator
Compute the minimum zipper length to buy for a given opening length and zipper type, accounting for slider parking and stop placement. Useful when shopping zippers before starting construction so you do not buy short.
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
| Zipper Length Calculator | Hem Allowance Calculator | |
|---|---|---|
| Category | Sewing | Sewing |
| Inputs required | 2 | 3 |
| Result | Recommended Zipper Length (inches) | Total Cutting Length (inches) |
| What it does | Compute the minimum zipper length to buy for a given opening length and zipper type, accounting for slider parking and stop placement. Useful when shopping zippers before starting construction so you do not buy short. | 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. |