BraSizeConversion

Bra Size Calculator: United Kingdom

7 sizing systems25+ country calculatorsBands 28-60, cups AA-PZero data stored

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.

Enter your measurements

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.

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.
Next steps

Last updated August 2026.