UK to US bra size
Convert a UK bra size to US in one step. Band and cup are shown separately below, since they do not always shift together.
UK to US band size chart
| UK band | US band | Underbust (cm) |
|---|---|---|
| 28 | 28 | 58 to 62 |
| 30 | 30 | 63 to 67 |
| 32 | 32 | 68 to 72 |
| 34 | 34 | 73 to 77 |
| 36 | 36 | 78 to 82 |
| 38 | 38 | 83 to 87 |
| 40 | 40 | 88 to 92 |
| 42 | 42 | 93 to 97 |
| 44 | 44 | 98 to 102 |
| 46 | 46 | 103 to 107 |
| 48 | 48 | 108 to 112 |
UK to US cup size chart
| Bust minus band (in) | UK cup | US cup |
|---|---|---|
| 1 | A | A |
| 2 | B | B |
| 3 | C | C |
| 4 | D | D |
| 5 | DD | DD |
| 6 | E | DDD / F |
| 7 | F | G |
| 8 | FF | H |
| 9 | G | I |
| 10 | GG | J |
| 11 | H | K |
Bra size is two independent measurements folded into one label: the band comes from the underbust circumference, and the cup comes from the difference between the bust and the band. UK and US both describe the same body, just with different numbering, so the band and cup charts above convert the label without changing the fit.
Band and cup conversions here are checked against the internationally published bra size conversion tables (matching the reference tables in Wikipedia's "Brassiere measurement" article), including Italy's separate small-number band scale. There is no single global standard for bra sizing the way there is for shoes or rings, so treat the chart as a strong starting point and confirm fit in person where possible.
To measure your own band and bust, see how to measure bra size, or use the bra size calculator to get your size from measurements directly.
Common questions
What is a UK 34 band in US?
A UK 34 band is a US 34 band, both fitting an underbust measurement of about 73 to 77 cm.
What is a UK DD cup in US?
A UK DD cup is a US DD cup. Cup letters match up to a D cup, then diverge, so always check the cup column rather than assuming the same letter.
How do I convert a UK bra size to US?
Find your UK band in the chart and read across to the US column for the band, then do the same on the cup table if it is shown. Both are anchored to real body measurements, so the conversion holds regardless of brand.
What if I'm between two band sizes?
Choose the smaller band on the loosest hook. A band that is snug on the loosest setting still has room to tighten as the band stretches with wash and wear.
Last reviewed and updated on July 2, 2026. Band and cup conversion tables are checked against published international bra size conversion charts.