Bra Size Calculator South Korea
South Korea uses centimetre bands in steps of 5 (65, 70, 75, 80, 85, 90), very close to Japanese sizing, with cup letters that climb in small 2.5 cm steps. That is why Korean cup letters look higher than US ones for the same body.
Enter Your Measurements
Sizes on this page are estimates. Sizing varies by brand and style, so always check the brand’s own size chart and try on before you buy. Nothing here is medical advice.
How to measure
You need a soft measuring tape and two minutes. Underbust: wrap the tape directly under your bust, level and snug, breathing out normally. Bust: wrap it around the fullest part, level across your back, without pressing in. Enter both numbers above, in inches or centimetres. The full steps are in the step-by-step measuring guide.
South Korea bra size chart
| KR band (cm) | US / UK band | FR band |
|---|---|---|
| 65 | 28 | 80 |
| 70 | 30 | 85 |
| 75 | 32 | 90 |
| 80 | 34 | 95 |
| 85 | 36 | 100 |
| 90 | 38 | 105 |
Cups run by the difference between your bust and band measurements. One inch of difference is roughly one cup step in US and UK sizing; in centimetre systems the steps are 2.5 cm.
How South Korea sizing works
Korean bands run 65, 70, 75, 80, 85, 90 and beyond in centimetres. Cup letters start at A and climb one letter per 2.5 cm of difference — faster than the US one-inch steps — so a US DD is commonly labeled F or G in Korea for the same volume. Korean sizing is standardized under KS K9404, and it closely matches Japanese sizing (JIS L4006).
A worked example
A 34-inch underbust with a 3-inch difference is a Korean 85D, a Japanese 85D, and a US 34C.
Converting to and from South Korea sizes
A Korean 75F is roughly a US 34DD — the letter looks bigger only because the steps are smaller. Convert with the global converter rather than matching letters, and check the brand's own chart, because Korean brands vary in how they grade larger cups.
Common measuring mistakes
Measuring over a padded bra lifts and compresses, giving a smaller bust reading. Measure without a bra or in a thin, unpadded one. Pulling the tape too tight underestimates the band. Letting the tape droop at the back overestimates the bust. Using an old size without re-measuring — weight, pregnancy, breastfeeding and aging all change the numbers, so re-measure every year or two.
Shopping tips for South Korea
Korean stores label in centimetre bands with fast-climbing cup letters. If you are buying Korean brands online, convert your size first rather than matching letters — a Korean F is not a US F. Also check the brand's own chart, because Korean brands vary in how they grade larger cups.
One habit covers every system: check the system on the label, convert both the band and the cup, and try the bra on before committing to more than one. Returns are easier than a drawer full of the wrong size.
Frequently Asked Questions
What sizing system does South Korea use?
Korean bands run 65, 70, 75, 80, 85, 90 and beyond in centimetres. Cup letters start at A and climb one letter per 2.5 cm of difference — faster than the US one-inch steps — so a US DD is commonly labeled F or G in Korea for the same volume. Korean sizing is standardized under KS K9404, and it closely matches Japanese sizing (JIS L4006). If a label you are reading does not match this system, it is probably an import — convert it rather than guessing.
How do I convert my US or UK size to a South Korea size?
A Korean 75F is roughly a US 34DD — the letter looks bigger only because the steps are smaller. Convert with the global converter rather than matching letters, and check the brand's own chart, because Korean brands vary in how they grade larger cups. The global size converter does this translation for any size in one step.
What if my size is not sold, or I am between sizes?
Try a sister size: one band down and one cup up, or one band up and one cup down, keeping roughly the same cup volume. If you are between cups, start with the larger cup — you can tighten a band, but you cannot add cup volume.
Do brands in South Korea vary?
Yes. Every system is a starting point, not a guarantee: band stretch, cup depth, wire width and grading vary by brand and style. Always check the brand's own chart and try on when you can.