Seam Allowance & Cutting Calculator
Calculate cutting dimensions with seam allowances and hem allowances for sewing patterns
About this calculator
The Seam Allowance & Cutting Calculator helps sewers determine the exact fabric dimensions needed for cutting pattern pieces by automatically adding seam and hem allowances to finished measurements. This essential sewing tool eliminates guesswork and prevents costly fabric cutting mistakes, ensuring you have sufficient material for proper seam construction and hemming. Whether you're working with commercial patterns or drafting your own, this calculator streamlines the cutting process and improves sewing accuracy for professional-looking results.
How to use
Enter your finished garment measurements (length and width) into the calculator. Input your desired seam allowance (typically ⅝ inch) and hem allowance (usually 1-2 inches). The calculator will instantly provide the total cutting dimensions you need, adding all allowances to your base measurements for accurate fabric cutting.
Frequently asked questions
What's the standard seam allowance for most sewing projects?
Most commercial patterns use ⅝ inch (1.5cm) seam allowances, though some use ½ inch. Always check your pattern instructions first.
How much hem allowance should I add for different garments?
Skirts and dresses typically need 1-2 inches, pants need 1.5-2 inches, and sleeves usually require ¾ to 1 inch for hems.
Can I use this calculator for quilting projects?
Yes, though quilting typically uses ¼ inch seam allowances. Adjust the seam allowance input accordingly for quilting accuracy.