F cup bra size
In US, EU and FR/BE sizing the letter F is a 6 in difference between bust and band, in UK and AU/NZ sizing it is 7 in, and in JP sizing it is 5 in.
In US sizing a F cup is a difference of 6 in (15.2 cm) between bust and band.
F at 6 in, system by system
A cup letter stands for a difference between bust and band. The same letter sits at a different difference in some systems.
| System | Difference (in) | Difference (cm) | Written as |
|---|---|---|---|
| US | 6 | 15.2 | DDD/F |
| UK | 7 | 17.8 | F |
| EU | 6 | 15.2 | F |
| FR/BE | 6 | 15.2 | F |
| AU/NZ | 7 | 17.8 | F |
| JP | 5 | 12.7 | F |
| EU method (cm) | Measured in cm | 22 to 24 cm | F |
Where sources disagree about F
- US letters: most charts print DD/E, DDD/F and DDDD/G, and some US brands use other sequences between D and H.
- UK double letters: FF, GG and HH appear in many UK charts, and one UK retailer leaves out some of them.
- JP letters vary by brand, and the JP column follows one label chart.
The figure for F differs by system: 6 in, 7 in or 5 in. The US figure for 6 in is 15.2 cm.
US tags print DDD/F together, as the letters DDD and F are used for the same cup. At 6 in, UK and AU/NZ tags print E, EU and FR/BE tags print F, and JP prints G.
E comes before F in EU, FR/BE, AU/NZ and JP, with G after it, while the UK sequence runs from E to F to FF. E stands for 5 in and G stands for 7 in, a step either side of F.
The EU method sets F at 22 cm to under 24 cm. Your bust is 37.5 to 38.5 in on band 32 (95.3 to 97.8 cm), then 39.5 to 40.5 in, 41.5 to 42.5 in and 43.5 to 44.5 in on bands 34, 36 and 38.
One band down and one cup up from 34F is 32G, and one band up and one cup down is 36E. From 36F the same moves lead to 34G and 38E.
Questions
What does a F cup mean?
A F cup is a difference of 6 in (15.2 cm) between bust and band in US sizing. The letter names the size of that difference.
Which difference is a F cup in each system?
US 6 in, UK 7 in, EU 6 in, FR/BE 6 in, AU/NZ 7 in and JP 5 in.
Do all systems write a F cup the same way?
Not everywhere. In US sizing it is 6 in, and UK (7 in), AU/NZ (7 in) and JP (5 in) differ.