Pattern Grading Calculator
Free pattern grading calculator for indie designers. Based on the Aldrich system — 3 size charts, 22 measurement points, instant results.
14
Size Charts
22
Measurements
8
Languages
Pattern Grading Shouldn’t Be This Hard
Professional grading software costs hundreds of dollars. Manual calculations are slow and error-prone. Textbook charts are hard to navigate. There should be a better way.
Pattern Grader puts Aldrich-based grading data at your fingertips — free, instant, and available in 8 languages.
What This Tool Offers
14 Size Charts
Women’s, Men’s, and Children’s sizing systems — including High-street Fashion, Standard, Athletic, and XS–XXL ranges.
22 Measurement Points
Full-body coverage from bust to ankle. Every measurement you need to grade a complete pattern set.
Breakpoint Detection
Automatic highlighting where grading increments change. See exactly where size proportions shift.
cm / inch Toggle
Switch between metric and imperial units instantly. All conversions are handled automatically.
3 Calculator Modes
Easy mode for quick lookups, Custom mode for your own rules, and Advanced mode for full spreadsheet-style editing.
Export & Save
Save grading rules to your account. Export to PDF, Excel, or CSV for production-ready documentation.
How It Works
Choose a size chart
Select from 14 Aldrich-based charts across Women’s, Men’s, and Children’s categories.
Set your base size & range
Pick the base size you’re grading from, and the target size range you need.
Get instant grading data
View all measurement increments at once — with breakpoint detection and cm/inch toggle.
Free Forever. Pro When You Need It.
Start grading patterns right now — no account required. Upgrade to Pro for saved rules, exports, and more.
- All 14 size charts
- 3 calculator modes
- cm / inch toggle
- Saved grading rules
- PDF & Excel export
- Version backup
Frequently Asked Questions
Trusted Data Source
All size charts and measurements are based on Aldrich Metric Pattern Cutting for Women’s Wear, 6th Edition (2015, Wiley) — a standard reference in fashion education worldwide.
Ready to grade your patterns?
Start for Free