Results
Enter two measurements to see regional conversions, sister sizes, and fitting guidance.
ToolYak Bra Size Calculator estimates your bra size. It uses your bust and band measurements. For best results, measure carefully. Use the nearest ¼ inch or ½ cm.
💡 Find Your Perfect Fit with Our Bra Size Calculator
Struggling with uncomfortable bras or inconsistent sizing? Our Bra Size Calculator takes the guesswork out of finding your true size. Whether you’re shopping online or just double-checking your fit, this tool makes it simple, accurate, and fast.
🔍 Key Features
- Supports both inches and centimeters
- Accounts for bust shape and fit preference
- AI-based feedback for extreme or unusual sizes
- Instant conversion across global size systems (US, UK, EU, AU)
- Responsive design for mobile and desktop
📊 Tables Used in This Calculator
1. Cup Size Mapping (US)
| Difference (inches) | Cup |
|---|---|
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD |
| 6 | E |
| 7 | F |
| 8 | G |
| 9+ | H–O |
2. Band Conversion Table
| System | Band |
|---|---|
| US/UK | 28–50 |
| EU (cm) | 60–110 |
| FR (cm) | 75–125 |
| AU/NZ | 6–26 |
3. Cup Letter Equivalents
| US | UK | EU | AU |
|---|---|---|---|
| A | A | A | A |
| DD | DD | E | DD |
| DDD/F | FF | F | F |
| G | G | H | G |
Frequently Asked Questions
It uses validated formulas and considers real-world preferences like fit tightness and bust shape.
Yes, you can choose between inches and centimeters for both bust and band sizes.
This means your input falls outside the defined range. Double-check your measurements or try a different fit preference.
Yes, it converts to US, UK, EU, FR, and AU sizes instantly.
Completely free, no login required, and it works perfectly on mobile too.