Hem Allowance Calculator
Calculate total fabric length including hem allowances
About this calculator
The Hem Allowance Calculator helps sewers and tailors determine the total fabric length needed for projects by automatically adding proper hem allowances to measurements. This essential sewing tool prevents fabric shortages and ensures professional-looking finished edges by calculating extra material needed for hems, cuffs, and seam allowances. Whether you're hemming curtains, pants, skirts, or tablecloths, this calculator eliminates guesswork and reduces costly measuring mistakes that can ruin projects.
How to use
Enter your desired finished length measurement and select your hem type (single fold, double fold, or blind hem). The calculator will automatically add the appropriate hem allowance based on fabric type and hemming method. The result shows your total cutting length, ensuring you have enough fabric for a perfect professional finish.
Frequently asked questions
What's the standard hem allowance for pants?
Most pants require 1.5 to 2 inches for hem allowance, allowing for adjustments and a professional double-fold hem finish.
How much extra fabric do I need for curtain hems?
Curtains typically need 4-6 inches total: 3-4 inches for the bottom hem and 1-2 inches for the top hem.
Can this calculator work for different fabric types?
Yes, the calculator adjusts recommendations based on fabric weight and type, from lightweight silks to heavy denim materials.