Bra Size Converter
Convert bra sizes between US, UK, EU, French, Italian, Australian, and Japanese systems.
Includes band and cup cross-reference charts with measuring tips.
Select a size in any system — the equivalents show instantly.
Bra sizes vary by country. Each system uses different band numbering and cup letter schemes.
Band size conversions:
| US/UK | EU | French | Italian | Japan |
|---|---|---|---|---|
| 30 | 65 | 80 | 0 | 65 |
| 32 | 70 | 85 | 1 | 70 |
| 34 | 75 | 90 | 2 | 75 |
| 36 | 80 | 95 | 3 | 80 |
| 38 | 85 | 100 | 4 | 85 |
| 40 | 90 | 105 | 5 | 90 |
| 42 | 95 | 110 | 6 | 95 |
| 44 | 100 | 115 | 7 | 100 |
Cup size conversions: US and UK cups diverge after D.
- US: A, B, C, D, DD, DDD/F, G, H, I, J
- UK: A, B, C, D, DD, E, F, FF, G, GG, H
- EU: A, B, C, D, E, F, G, H (same letter = same size as UK mostly)
How band sizes relate:
- EU band = US band × 2.54 (rounded to nearest 5)
- French band = EU band + 15
- Australian band = US band - 22 (sometimes differs)
Measurement method (both systems):
- Measure under the bust (band size).
- Measure around the fullest part (bust size).
- The difference determines the cup size.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.