Pattern Grading Calculator
Calculate size adjustments for pattern grading and fit modifications
About this calculator
The Pattern Grading Calculator helps fashion designers, seamstresses, and pattern makers calculate precise size adjustments when scaling patterns up or down between different sizes. This essential tool ensures consistent fit and proportions across size ranges by computing the exact measurements needed for each pattern piece. Whether you're grading from a base size to create a full size run or making custom fit modifications, this calculator eliminates guesswork and maintains professional pattern accuracy.
How to use
Enter your base pattern measurements and target size specifications into the calculator. Select the grading method (proportional or grade rule) and input the size increment you're working with. The calculator will provide the exact adjustments needed for each measurement point, showing you how much to add or subtract from your original pattern pieces.
Frequently asked questions
What's the difference between proportional and grade rule grading?
Proportional grading scales all measurements equally, while grade rule grading uses specific increment amounts for different body areas based on industry standards.
Can I use this for both men's and women's patterns?
Yes, the calculator works for all garment types. Simply adjust your grade increments based on the specific sizing standards for your target market.
How accurate are the grading calculations?
The calculator provides precise mathematical adjustments, but always test fit your graded patterns as body proportions can vary between individuals within size ranges.