UK Bra Size Guide
Complete UK bra size chart covering all band sizes 28–46 and cups AA to K. Use the visual chart below or our calculator for your exact size.
Full UK Bra Size Chart
Cells in pink = available in most UK retailers. ✓ = common size.
| Band → Cup ↓ | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
|---|---|---|---|---|---|---|---|---|---|---|
| AA | 28AA | 30AA | 32AA | 34AA | — | — | — | — | — | — |
| A | 28A | 30A | 32A | 34A | 36A | — | — | — | — | — |
| B | 28B | 30B | 32B | 34B | 36B | 38B | — | — | — | — |
| C | 28C | 30C | 32C | 34C | 36C | 38C | 40C | — | — | — |
| D | 28D | 30D | 32D | 34D | 36D | 38D | 40D | 42D | 44D | 46D |
| DD | 28DD | 30DD | 32DD | 34DD | 36DD | 38DD | 40DD | 42DD | 44DD | 46DD |
| E | 28E | 30E | 32E | 34E | 36E | 38E | 40E | 42E | 44E | 46E |
| F | 28F | 30F | 32F | 34F | 36F | 38F | 40F | 42F | 44F | 46F |
| FF | 28FF | 30FF | 32FF | 34FF | 36FF | 38FF | 40FF | 42FF | 44FF | 46FF |
| G | 28G | 30G | 32G | 34G | 36G | 38G | 40G | 42G | 44G | 46G |
| GG | 28GG | 30GG | 32GG | 34GG | 36GG | 38GG | 40GG | 42GG | 44GG | 46GG |
| H | 28H | 30H | 32H | 34H | 36H | 38H | 40H | 42H | 44H | 46H |
| HH | — | 30HH | 32HH | 34HH | 36HH | 38HH | 40HH | 42HH | 44HH | 46HH |
| J | — | — | 32J | 34J | 36J | 38J | 40J | 42J | 44J | 46J |
| JJ | — | — | — | 34JJ | 36JJ | 38JJ | 40JJ | 42JJ | 44JJ | 46JJ |
| K | — | — | — | — | 36K | 38K | 40K | 42K | 44K | 46K |
Availability varies by retailer. Bravissimo and specialist stores offer the widest size range.
Understanding UK Bra Sizes
Band Size (The Number)
The number in a UK bra size (e.g. 34C) is the band size. It's measured in inches around your underbust. UK band sizes run in even numbers: 28, 30, 32, 34, 36, 38, 40, 42, 44, 46.
Cup Size (The Letter)
The letter (e.g. 34C) is the cup size. It's determined by the difference between your bust and underbust measurements. UK cup sizes: AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K.
Most Popular UK Bra Sizes
The most commonly sold UK bra sizes. If your size isn't here, you're not alone — most women wear the wrong size!
Cup Size Visual Comparison
Visual guide to UK cup sizes AA through G. For the full visualiser, visit our Cup Size Comparison tool.
Not sure of your size?
Use our free AI-powered calculator to find your perfect UK bra size in seconds.
Common Bra Fit Problems & How to Fix Them
Up to 80% of women wear the wrong size. Here is the professional troubleshooting guide to finding your perfect fit.
1. Band Riding Up at the Back
Why it happens: Your bra band is too large. When the band is too loose, the weight of the breasts pulls the front down and forces the back of the band upwards.
The Fix: Go down one band size (e.g. 36 to 34) and go up one cup size (e.g. D to DD) to keep the cup volume the same.
2. Cups Gaping or Wrinkling
Why it happens: This is usually caused by cup sizes that are too large, or a shape mismatch (e.g. wearing a balcony bra when you need a demi/plunge shape). Note: a too-tight band can also pull the cups flat, causing them to gape.
The Fix: Try going down a cup size (e.g. 32D to 32C) or verify your band snugness first.
3. Underwire Poking or Digging
Why it happens: Underwire poking into the breast tissue at the sides indicates that the cup is too small, or the wire is too narrow for your breast root.
The Fix: Try going up a cup size (e.g. 34E to 34F). The underwire should sit entirely on your ribcage behind all breast tissue.
4. Bulging or 'Four-Boob' (Quadboob)
Why it happens: If your breasts spill over the top or sides of the cups (known as quadboobing or double-boobing), your cup size is definitely too small.
The Fix: Go up one or two cup sizes (e.g. 36DD to 36F). The cups should smoothly encase your breasts without any visible bulge or ridge.
5. Straps Slipping or Digging In
Why it happens: If straps dig in, the band is too loose and is not providing 80% of the support. If straps slip off, they may be adjusted poorly, or your shoulders are narrow/sloped.
The Fix: Tighten the band (go down a band size) to let the band carry the weight, and adjust the straps so you can fit one finger comfortably underneath.
UK Bra Size Guide — Frequently Asked Questions
What are the UK bra sizes in order?+
UK bra sizes go by band size (the number) and cup size (the letter). Band sizes run in even numbers: 28, 30, 32, 34, 36, 38, 40, 42, 44, 46. Cup sizes in order are: AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K. A full UK bra size looks like 34C or 36DD.
How do I read a UK bra size chart?+
A UK bra size chart has band sizes (numbers 28–46) across one axis and cup sizes (letters AA through K) across the other. Find your band size column (based on underbust in inches), then your cup row (based on the difference between bust and underbust). The intersecting cell is your UK bra size.
What is the most common UK bra size?+
The most commonly sold UK bra sizes are 34B, 36C, and 34C. However, research by fitting specialists suggests many women wear the wrong size — using our calculator often reveals they’re actually a 32D or 30DD.
Is UK bra sizing the same as US bra sizing?+
No. UK and US bra sizing diverge at the cup level. UK cups: AA, A, B, C, D, DD, E, F, FF, G etc. US cups: A, B, C, D, DD (=E), DDD (=F), G etc. Band sizes use the same numbering. Use our size converter for a full UK to US conversion.
Expert Reviewed Fitting Guides
Every size recommendation and standard reference in this guide is reviewed by certified professionals.
Eleanor Vance
Certified Bra Fitter & Lingerie Consultant
Over 12 years of professional fitting experience at leading UK lingerie retailers, including Bravissimo and Marks & Spencer. Specially certified in maternity, teen first-fit, and post-surgery supportive consultations.
Sizing Math & Rounding Logic
Our calculator implements the industry-standard **modern fitting method** rather than the obsolete "plus-4" retail formula. Band sizes are derived directly from snug ribcage measurements in inches (rounded to the nearest even number). Cup sizes are calculated using the precise 1-inch difference increments between fuller bust and underbust measurements (e.g. 4" = D, 5" = DD, 6" = E).
Sourced Claims & Studies
Medical and biomechanical research shows that up to **80% of UK women wear the wrong bra size**. According to breast health clinical research from the **University of Portsmouth (Department of Sport and Exercise Science)**, properly fitted encapsulation support reduces vertical breast movement by up to 59%, significantly preventing exercise-induced breast discomfort and cooper's ligament stretching.