Bra Size Conversion Calculator
UK, US, European and Australian bra sizes.
Convert a bra size between UK, US, European, French and Australian systems, with the cup letter differences above D made explicit.
Snug around the ribcage directly under the bust.
Loosely around the fullest part.
UK size
32D
US 32D · EU 80D · FR 95D
The band converts arithmetically; the cup does not. UK and US letters agree only to DD, after which a UK E is a US DDD. Treating those as the same letter is a size error rather than a translation.
How the Bra Size Conversion Calculator works
Bra size conversion has two independent parts and most charts only get one right. The band converts by simple arithmetic, since European bands are the measurement in centimetres. The cup does not: above a D the UK and US letters diverge, so a UK 32E is a US 32DDD and calling both of them E is a size error, not a translation.
Also known as: international bra size chart · bra cup conversion
Two conversions, only one of them arithmetic
The band converts cleanly. UK and US bands are the same inch measurement; European bands are the underbust in centimetres rounded to a five, so a 32 is about a 70, a 34 a 75, a 36 an 80. French and Spanish sizing is the European number plus fifteen, which is why an 85 in a French label is a 70 in a German one. Australian bands are numbered like dress sizes, starting at 8 for a 30.
The cup does not convert arithmetically. UK and US lettering agrees up to and including DD and then diverges permanently: the UK continues E, F, FF, G, GG, while the US repeats D as DD and DDD before jumping to G. Beyond DD, the same letter means different cups in the two systems.
Because the band steps differ — two inches in the UK against five centimetres in Europe — the two grids do not line up exactly, and some sizes convert to a value that falls between stocked European bands.
A worked example
A UK 32E has a 32-inch band and a six-inch difference. In the US that is a 32DDD: same garment, different label. In Europe the band is 32 inches, or 81 cm, rounded to an 80, giving 80E. In France the same bra is a 95E, and in Australia a 12E.
Five labels, one bra. The only one that would be actively wrong is calling the US size a 32E, which in US lettering would be a cup smaller than the wearer needs.
Where the answer misleads
Conversion tables assume both systems are describing the same body accurately, and cup shape differs by market as much as by brand. European cups are often cut with more projection and less width than UK equivalents at the same nominal size, so a correct conversion can still fit differently.
The plus-four band method complicates any conversion done from measurements rather than from a known size. If your starting size came from a plus-four chart and you convert it to a European band, you carry that method's error into a different system.
Where a retailer publishes its own conversion, use theirs. It reflects how their garments are actually graded, which a generic table cannot.
Frequently asked questions
What is a UK 34DD in US sizing?
A 34DD as well. The two systems agree up to and including DD; they only diverge from the next cup up, where the UK uses E and the US uses DDD.
How do European band sizes work?
They are the underbust measurement in centimetres, rounded to a five: a UK 32 band is roughly a European 70, a 34 is 75, a 36 is 80. The step is 5 cm against the UK's 2 inches, which is why they do not line up exactly.
Is French sizing different from European?
Yes, by fifteen. A French 85 is a European 70. Both are centimetre-based, but the French scale adds fifteen to the number, which catches people out buying from French labels.
Which system is Australia on?
Australian bands are numbered like dress sizes, so an 8, 10, 12 rather than a 30, 32, 34, while the cups follow the UK letters. An Australian 12C is a UK 34C.