BraSizeConversion

Bra Size Calculator: United Kingdom

Measure once, and this calculator highlights your size in United Kingdom's UK convention while showing all 7 international systems for imported brands. Enter your snug underbust and fullest bust below.

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This calculation runs entirely in your browser. Your measurements are never stored or sent anywhere.

Shopping for bras in United Kingdom

The UK has the deepest cup ladder in the world, running D, DD, E, F, FF, G, GG and beyond, because British full-bust brands built their ranges around real fittings rather than compressing everyone into DDD. If you measure beyond a D, UK sizing describes you more precisely than US labels can.

Bravissimo, Freya and Fantasie cut for projected shapes with firm bands. Expect a new band to feel snugger than mall brands; that firmness is the support working.

Brands you will commonly see: M&S, Bravissimo, Freya, Fantasie, Boux Avenue.

How United Kingdom writes a bra size

Bands in United Kingdom are inches, even-numbered, and read the same as American ones, so the band is the half of the label that travels without trouble.

The cup ladder is the deepest in use anywhere: D, DD, E, F, FF, G, GG, H, HH, J. The doubled letters are real sizes rather than typos, which is why a United Kingdom tag describes a full bust more precisely than a US one.

Sizes are written band first, then cup, as in 34FF.

UK size conversion chart

Every row is one body. The UK column is what the label prints; the others are what the same bra is called elsewhere, which is what you need when a brand ships from abroad.

UKUSEUFRJP
32B32B70B85BC70
32D32D70D85DE70
34B34B75B90BC75
34C34C75C90CD75
34D34D75D90DE75
34DD34DD75E90EF75
36C36C80C95CD80
36D36D80D95DE80
36DD36DD80E95EF80
36E36DDD80F95FG80
38D38D85D100DE85
38DD38DD85E100EF85
40D40D90D105DE90

Common United Kingdom conversions, answered

What is a US 34D in United Kingdom?
A US 34D is a 34D in United Kingdom. The same bra is a UK 34D and an EU 75D.
What is a US 34DD in United Kingdom?
A US 34DD is a 34DD in United Kingdom. The same bra is a UK 34DD and an EU 75E.
What is a US 36DD in United Kingdom?
A US 36DD is a 36DD in United Kingdom. The same bra is a UK 36DD and an EU 80E.
What is a US 36DDD in United Kingdom?
A US 36DDD is a 36E in United Kingdom. The same bra is a UK 36E and an EU 80F.
Look up a specific size
32D32DD32DDD32F32I32K34D34DD
28 band30 band32 band34 band36 band38 band40 band42 band

Frequently asked questions

What bra sizing system does United Kingdom use?
United Kingdom primarily uses UK sizing conventions in mainstream retail, though imported brands can carry other systems' labels. The calculator above highlights your UK size and shows all 7 systems for imports.
Which bra brands are common in United Kingdom?
Commonly available names include M&S, Bravissimo, Freya, Fantasie, Boux Avenue. Local availability shifts, and each brand's own centimeter chart beats any converted label when they disagree.
What is a US 34DD in United Kingdom sizing?
A US 34DD is a 34DD in United Kingdom. The same bra is a UK 34DD and an EU 75E, because the cup ladders diverge after D.
Do I add inches to my underbust measurement in United Kingdom?
No. The old habit of adding four or five inches was written for non-stretch fabric and produces a band about two sizes too loose on a modern elastic one. Measure snug and level, and use that number directly, whichever system the label uses.
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Last updated August 2026.