This UK bra cup size chart explains how bra cup sizes progress in order, how the measurement system works, and how cup size relates to the difference between band size and the fullest bust measurement.
A bra cup size represents the difference between the bra band size and the fullest bust measurement. In the UK sizing system, each cup size increases by approximately one inch.
For example, if the bust measurement is 5 inches larger than the band size, the result corresponds to a DD cup. If the difference is 6 inches, the result corresponds to an E cup.
The typical UK cup sequence is: AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K → KK → L → LL.
The UK bra cup size chart follows this cup-size sequence:
AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K → KK → L → LL
Each step in the sequence typically represents approximately a one-inch increase in the difference between the bra band size and the fullest bust measurement.
For example, a DD cup corresponds to about a 5-inch difference, while a GG cup corresponds to around a 10-inch difference. The measurement chart further down the page shows how the full UK cup sequence progresses.
If you are unsure of your starting size, begin with our Bra Size Calculator and follow the measuring steps in our Bra Fitting Advice. You can also compare sizing systems using our Bra Size Converter.
Cup letters alone do not show a fixed breast volume because cup size changes with band size. You can see this more clearly in our guide explaining how big GG cup sizes are across different band sizes.
After checking the UK bra cup size chart above, you can explore how individual cup sizes change across different band sizes in our detailed guides:
Each guide shows the available band-and-cup combinations for that cup size and links to the individual Best Bras guides for specific UK bra sizes.
UK bra sizing includes several double-letter cup sizes, including DD, FF, GG and HH. These are individual cup sizes within the UK sequence rather than half sizes, with each step typically representing approximately a one-inch increase between the band size and the fullest bust measurement.
Cup size also needs to be considered together with band size because the same cup letter represents different volumes on different bands. You can explore this in more detail in our guides explaining how big B cups are, how big E cups are, how big F cups are, how big GG cups are and how big H cups are.
The UK cup-size system progresses according to the difference between the bra band size and the fullest bust measurement, with each step typically representing approximately one inch.
You can explore individual cup guides including AA cup bras, A cup bras, B cup bras, C cup bras, D cup bras, DD cup bras, E cup bras, F cup bras, FF cup bras, G cup bras, GG cup bras, H cup bras and HH cup bras.
To compare neighbouring cup sizes in more detail, see our AA vs A vs B cup size comparison, our guide explaining the difference between D, DD and E cup sizes, and the difference between F, FF and G cup sizes.
The UK bra cup size chart below shows how cup sizes correspond to the difference between the bra band size and the fullest bust measurement.
| Difference Between Band Size and Bust | UK Cup Size |
|---|---|
| 0 inch | AA |
| 1 inch | A |
| 2 inches | B |
| 3 inches | C |
| 4 inches | D |
| 5 inches | DD |
| 6 inches | E |
| 7 inches | F |
| 8 inches | FF |
| 9 inches | G |
| 10 inches | GG |
| 11 inches | H |
| 12 inches | HH |
| 13 inches | J |
| 14 inches | JJ |
| 15 inches | K |
| 16 inches | KK |
| 17 inches | L |
| 18 inches | LL |
Bra cup size always works together with band size, so two bras with the same cup letter can have different cup volumes when the band size changes.
Our Best Bras by Size directory lets you browse individual guides by exact UK band-and-cup size, with links to currently published recommendations across the UK size range.
For example, you can explore exact-size guides such as 30E, 34E, 34F, 36G and 38GG.
Use the full UK Bra Size Directory to find the guide for your exact size.
Many people compare neighbouring cup sizes to understand how the UK cup sequence progresses. Each step typically represents approximately a one-inch increase between the band size and the fullest bust measurement.
When comparing bra cup sizes, it is important to remember that cup letters do not represent a fixed breast volume.
In the UK sizing system, cup letters progress from sizes such as AA, A and B through double-letter and larger cup sizes including DD, FF, GG, HH and beyond. However, the actual cup volume also depends on the band size.
For example, a 30GG has a smaller cup volume than a 38GG, even though both bras use the same GG cup letter.
This is why a complete bra size always combines both the band size and cup size.
Want to compare specific band-and-cup sizes side by side? Use our UK Bra Size Visual Comparison Tool to compare all 220 UK bra sizes using original illustrations, measurements and sister size explanations.
Because cup size works together with band size, the same cup letter represents different bust measurements depending on the band. The examples below show how several UK cup sizes correspond to different band measurements, beginning with AA and progressing through the larger cup sizes.
| Band Size | AA Cup | A Cup | B Cup | C Cup | D Cup | DD Cup | E Cup |
|---|---|---|---|---|---|---|---|
| 32 | 32" | 33" | 34" | 35" | 36" | 37" | 38" |
| 34 | 34" | 35" | 36" | 37" | 38" | 39" | 40" |
| 36 | 36" | 37" | 38" | 39" | 40" | 41" | 42" |
| 38 | 38" | 39" | 40" | 41" | 42" | 43" | 44" |
| Band Size | F Cup | FF Cup | G Cup | GG Cup |
|---|---|---|---|---|
| 32 | 39" | 40" | 41" | 42" |
| 34 | 41" | 42" | 43" | 44" |
| 36 | 43" | 44" | 45" | 46" |
| 38 | 45" | 46" | 47" | 48" |
Double cup sizes such as DD, FF, GG and HH are individual cup sizes within the UK bra sizing system. They are not half sizes; each represents the next step in the UK cup-size progression.
These double cup sizes create additional stages within the UK sequence between single-letter cup sizes.
Many UK lingerie brands such as Freya, Panache and Bravissimo use this extended UK cup-size sequence.
For a fuller explanation, see our Double Cup Bra Sizes Guide.
The guides below explain how each cup size fits within the UK bra sizing sequence, including the band-and-cup combinations available for each cup size.
In the UK bra sizing system, the cup size after DD is E. The sequence then continues E, F, FF, G, GG and so on.
No. Double cup sizes such as DD, FF and GG are individual steps within the UK cup-size sequence. They are not half sizes.
No. Cup size always works together with band size. For example, a 30GG, 34GG and 40GG all have different cup volumes even though the cup letter is the same.
No. Many UK lingerie brands use the extended UK cup sequence, but international sizing systems and individual brands may use different cup progressions. Use our Bra Size Converter when comparing sizing systems.
The UK bra cup size chart is based on the difference between your bra band size and your fullest bust measurement. Each inch of difference typically corresponds to the next cup size in the UK bra sizing sequence.
For example:
To find your starting size, measure your bust and underband using our Bra Size Calculator. You can then confirm the fit using our Bra Fitting Advice.
If you are unsure of your bra size, start by measuring your bust and underband using our Bra Size Calculator.
You can then confirm your fit using our Bra Fitting Advice and compare sizing systems using the Bra Size Converter.
