About
About Pattern Grader
Pattern Grader is a free, open web tool that helps indie pattern designers, fashion students, and home sewists grade sewing patterns across multiple sizes. Most grading tools are either expensive commercial software or locked behind subscriptions. We built this to make professional-grade size data freely accessible to everyone.
Data Source
The size charts and body measurement data in this tool are based on Winifred Aldrich’s Metric Pattern Cutting for Women’s Wear, 6th Edition (2015, published by Wiley). This textbook is a widely-adopted reference in fashion education and industry, used in universities and design studios around the world.
Accuracy & Disclaimer
This tool is provided for educational and reference purposes. While we strive for accuracy, pattern grading involves many variables beyond size charts — fabric behaviour, design ease, and individual fit preferences. For commercial production, always conduct your own fitting tests and validate measurements against your target customer base.
Feedback
Found a bug, have a suggestion, or want to request a feature? We’d love to hear from you. Please reach out at support@patterngrader.com.
What’s Next
We’re planning to add custom measurement input, PDF export, additional sizing systems (menswear, childrenswear), and more interactive tools. Stay tuned for updates.