D cup bra size
Where the US, UK, EU, FR/BE and AU/NZ systems print D, the difference is 4 in; JP reads the same letter as 3 in.
In US sizing a D cup is a difference of 4 in (10.2 cm) between bust and band.
D at 4 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 | 4 | 10.2 | D |
| UK | 4 | 10.2 | D |
| EU | 4 | 10.2 | D |
| FR/BE | 4 | 10.2 | D |
| AU/NZ | 4 | 10.2 | D |
| JP | 3 | 7.6 | D |
| EU method (cm) | Measured in cm | 18 to 20 cm | D |
Where sources disagree about D
- JP letters vary by brand, and the JP column follows one label chart.
9 sizes carry a D cup
Every size page that has this cup.
A JP tag prints E at 4 in and keeps its D for 3 in. Everywhere else D means 4 in, which is 10.2 cm in the US figure.
Your D comes straight after C in every system. What follows it depends on the tag: DD/E in US, DD in UK and AU/NZ, and E in EU, FR/BE and JP.
The EU method places D at 18 cm to under 20 cm of bust minus band, a stretch two centimetres wide.
Bust for D starts at 35.5 to 36.5 in on band 32 (90.2 to 92.7 cm), then moves to 37.5 to 38.5 in, 39.5 to 40.5 in and 41.5 to 42.5 in across bands 34, 36 and 38.
Going down a band and up a cup turns 34D into 32DD, and going up a band and down a cup turns it into 36C. For 36D the matching pair is 34DD and 38C. Published charts disagree about the letter after D, while C before D is the same everywhere.
Questions
What does a D cup mean?
A D cup is a difference of 4 in (10.2 cm) between bust and band in US sizing. The letter names the size of that difference.
Which difference is a D cup in each system?
US 4 in, UK 4 in, EU 4 in, FR/BE 4 in, AU/NZ 4 in and JP 3 in.
Do all systems write a D cup the same way?
Not everywhere. In US sizing it is 4 in, and JP (3 in) differ.