Pattern Grading Calculator
Calculate measurements for grading sewing patterns up or down sizes
About this calculator
The Pattern Grading Calculator helps sewers and fashion designers adjust sewing patterns to different sizes by calculating precise measurement changes needed for each pattern piece. This tool eliminates the guesswork involved in scaling patterns up or down, ensuring proper fit across multiple sizes. Whether you're grading a commercial pattern for production or adjusting a personal pattern for family members, this calculator provides accurate measurements to maintain the garment's proportions and design integrity while saving time and reducing fabric waste from fitting errors.
How to use
Enter your original pattern measurements and select the target size you want to grade to. Input key measurements like bust, waist, hip, and length dimensions. The calculator will automatically compute the adjustment amounts needed for each measurement point, showing you exactly how much to add or subtract from each pattern piece to achieve the desired size.
Frequently asked questions
What's the difference between grading up and grading down a pattern?
Grading up increases pattern size by adding measurements, while grading down decreases size by subtracting measurements. Both maintain the original design proportions.
How many sizes can I safely grade from the original pattern?
It's recommended to grade no more than 2-3 sizes up or down from the original to maintain proper fit and proportions.
Do I need different grading rules for different garment types?
Yes, fitted garments like dresses require more precise grading than loose-fitting items like oversized shirts or jackets.