Bra Size Calculator
Calculate your bra size from band and bust measurements.
Shows results in US, UK, and EU sizing systems.
Your data stays in your browser. We do not store, collect, or transmit any information you enter.
Your Bra Size
How to measure for a bra:
- Band: Measure snugly around your ribcage, just under your bust.
- Inches: Round to nearest whole number. If even, add 4". If odd, add 5".
- Centimeters: The calculator converts cm to inches automatically.
- Bust: Measure loosely around the fullest part of your bust.
Cup size = difference between bust and adjusted band:
| Difference (in) | Difference (cm) | Cup Size |
|---|---|---|
| 0" | 0 cm | AA |
| 1" | 2.5 cm | A |
| 2" | 5 cm | B |
| 3" | 7.5 cm | C |
| 4" | 10 cm | D |
| 5" | 12.5 cm | DD/E |
| 6" | 15 cm | DDD/F |
| 7" | 17.5 cm | G |
| 8" | 20 cm | H |
Band size conversions: US 32 = EU 70, US 34 = EU 75, US 36 = EU 80, US 38 = EU 85.
Bra sizing varies by brand. Use as a starting point.