This A cup bras by band size guide helps you find the individual guide for your exact band size, with links to detailed pages for each available UK A band size.
An A cup sits within the UK bra sizing system between AA and B. However, a 28A, 34A and 40A represent different cup volumes because cup volume changes with band size.
If you want to understand the size itself before choosing a band, see our A Cup Bras Guide or explore visual comparisons in our How Big Are A Cups? guide.
If you are unsure of your starting size, begin with the Bra Size Calculator. You can then confirm your fit using our Bra Fitting Advice and compare sizing across brands using the Bra Size Converter.
An A bra size is part of the UK bra sizing system and sits between AA and B in the cup progression.
Cup size is not a fixed volume on its own. A 30A, 34A and 40A all represent different cup volumes because cup volume increases as the band size increases.
For a clearer picture of measurements and volume, see our How Big Are A Cups? guide.
You can also compare A with neighbouring cup sizes using our AA vs A vs B Cup Size Comparison or explore the wider UK sequence in our UK Bra Cup Size Chart.
You can also explore detailed A-size guides for 32A, 34A and 36A.
Compare A cup sizes across different UK band measurements to see how cup volume changes as the band size increases.
The guides below cover several A cup sizes across different UK band measurements.
Browse our A cup bras by band size directory below to find the individual guide for your UK band-and-cup size.
Cup volume increases as band size increases. This means a 40A has more cup volume than a 30A, even though both use the same A cup letter.
Because band size and cup size work together, looking at the exact band-and-cup combination gives a clearer picture than considering the cup letter alone.
For example, a 32A bra, 34A bra and 36A bra all use an A cup letter, but each represents a different band measurement and overall cup volume.
Our A cup bras by band size directory brings together the available UK A sizes from 28A to 48A, making it easier to move directly to the guide for your exact band-and-cup size.
An A bra size is part of the UK bra sizing system and sits between AA and B in the cup progression. For more detail, see our How Big Are A Cups? guide.
Yes. In the UK cup sequence, A comes directly after AA. When the band size remains the same, A is one cup size larger than AA.
The cup size after A in the UK bra sizing system is B. The sequence around these sizes is AA → A → B → C.
No. Cup volume changes with band size. For example, a 30A has less cup volume than a 38A even though both use the same A cup letter.
For additional background on bra sizing systems, you may also find this bra size overview helpful alongside the guides on this site.
An A cup is one of the smaller cup letters in the UK bra sizing sequence, but cup size is relative to band size rather than a fixed measure of breast size. For example, a 30A and a 40A do not have the same cup volume. See our How Big Are A Cups? guide for visual comparisons across different band sizes.
Browse the band-size guides above to go directly to the individual page for your exact UK A bra size.
