Find your bra size in China, Japan, Hong Kong, or Korea
Measure your band and bust in centimetres to get your size on the shared East Asian chart.
Wrap the tape snugly around your ribcage, directly under your bust.
Wrap the tape around the fullest part of your bust.
Your size
Measuring tips for an accurate fit
This chart is measured entirely in centimetres. Measure over a thin, unpadded bra or bare skin, keeping the tape snug but not tight, and take both measurements while standing normally.
Japan, Korea, and China share the same underlying structure: bands are labelled in centimetres and rise in 5 cm steps, the same scale used across the EU, while cup letters step up every 2.5 cm rather than the 2 cm gap used in EU and US charts. That finer gap is why you'll see more cup letters on this calculator than on the EU/US/UK version, starting from AAA for a close-to-band bust measurement and running all the way through the alphabet for a fuller one. It's also why a size that looks right on paper can still run shallow in the cup, since brands in this region tend to cut a touch closer to the body. If you're moving between a Western size and this chart for the first time, it's worth reading how international sizing conversion works before you buy, and keeping the signs of a proper fit in mind once the bra arrives.
Band and cup size chart for Japan, Korea, and China
Bands below are in centimetres, matching what you measured, alongside the nearest US/UK band on the same body.
| Band (cm) | Nearest US/UK band (in) |
|---|---|
| 60 | 28 |
| 65 | 30 |
| 70 | 32 |
| 75 | 34 |
| 80 | 36 |
| 85 | 38 |
And here is the cup ladder for a 75 band specifically (the closest match to a US/UK 34), showing how the 2.5 cm steps work in practice.
| Bust (cm) | Cup letter |
|---|---|
| 75-82.5 | AAA |
| 82.5-85 | AA |
| 85-87.5 | A |
| 87.5-90 | B |
| 90-92.5 | C |
| 92.5-95 | D |
| 95-97.5 | E |
| 97.5-100 | F |
The ladder keeps climbing in the same 2.5 cm steps well past F for a fuller bust - the calculator above gives you the precise letter for your own measurements.
Frequently asked questions
How do I measure my band size?
Wrap a soft tape measure snugly around your ribcage, directly under your bust, keeping it level and parallel to the floor.
How do I measure my bust size?
Wrap the tape around the fullest part of your bust, across the nipple line, without pulling it tight.
Why does this chart use half-centimetre cup steps?
Japanese, Korean, and Chinese sizing use 2.5 cm cup steps rather than the 2 cm steps common in EU/US charts, giving a finer-grained fit between letters - which is also why this calculator shows more cup letters than the other regions.
Do Japan, Korea, and China really all use the same bra size chart?
This calculator treats them as one shared centimetre-based chart, since all three follow the same band-in-centimetres, 2.5 cm cup-step structure. Individual brands within each country can still fit differently, so use the result here as your starting point rather than a guarantee.
Should I size up when ordering a bra from Japan, Korea, or China?
Often, yes, at least in the cup. Brands from this region tend to cut the cup a touch shallower than US or UK equivalents, so a size that matches on paper can run tight in the cup once it's on. Going up one cup letter is a common first-order adjustment, especially if you usually wear a US or UK brand.