C cup bra size
The letter C stands for a difference of 3 in between bust and band in the US, UK, EU, FR/BE and AU/NZ systems, but for 2 in in JP.
In US sizing a C cup is a difference of 3 in (7.6 cm) between bust and band.
C at 3 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 | 3 | 7.6 | C |
| UK | 3 | 7.6 | C |
| EU | 3 | 7.6 | C |
| FR/BE | 3 | 7.6 | C |
| AU/NZ | 3 | 7.6 | C |
| JP | 2 | 5.1 | C |
| EU method (cm) | Measured in cm | 16 to 18 cm | C |
Where sources disagree about C
- JP letters vary by brand, and the JP column follows one label chart.
9 sizes carry a C cup
Every size page that has this cup.
JP is where your C changes. At 3 in, five systems print C but a JP tag prints D, and its own C means 2 in. The US figure for 3 in is 7.6 cm.
Between B at 2 in and D at 4 in, C is the middle step of three. The JP chart lists no letter before C, while the other systems print B there.
Under the EU method, C reads 16 cm to under 18 cm of bust minus band.
Trace your bust through the bands: 34.5 to 35.5 in on band 32 (87.6 to 90.2 cm), then 36.5 to 37.5 in, 38.5 to 39.5 in and 40.5 to 41.5 in on bands 34, 36 and 38.
Trading a band for a cup gives sister sizes: 34C pairs with 32D and 36B, while 36C pairs with 34D and 38B. The one disagreement listed for C is the JP offset of a single letter.
Questions
What does a C cup mean?
A C cup is a difference of 3 in (7.6 cm) between bust and band in US sizing. The letter names the size of that difference.
Which difference is a C cup in each system?
US 3 in, UK 3 in, EU 3 in, FR/BE 3 in, AU/NZ 3 in and JP 2 in.
Do all systems write a C cup the same way?
Not everywhere. In US sizing it is 3 in, and JP (2 in) differ.