Cup Size Guides

How Big Are Bra Cup Sizes? UK Cup Size Guide

Understanding bra cup sizes can be confusing, especially because cup volume changes with band size. This page brings together our UK cup size guides, visual examples, neighbouring cup comparisons and by-band-size guides from F to LL.

A cup letter does not always represent the same breast volume. For example, a 30F, 34F and 38F all have different cup volumes because cup size is linked to band size. If you are unsure where to start, use our Bra Size Calculator, compare sizes with our Bra Size Converter, or visit our Bra Fitting Advice.

Quick Answer:

UK cup sizes progress from F through to LL using both single-letter and double-letter cup sizes. The guides below explain how each cup size compares visually and how cup volume changes across different band sizes.

How UK Cup Sizes Progress

AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K → KK → L → LL

UK bra cup sizes progress through both single-letter and double-letter cup sizes. While this guide currently focuses on larger cup sizes from F upwards, additional cup size guides will be added over time to cover the full UK bra size range.

How Big Are Bra Cup Sizes Across Different Band Sizes?

Many people assume that a bra cup size always represents the same breast volume. In reality, cup volume changes with band size. For example, a 30F, 34F and 38F all have different cup volumes even though they share the same cup letter.

This is because bra sizing uses a combination of band size and cup size. As the band size increases, the overall cup volume also increases. That is why visual examples can be helpful when comparing UK bra cup sizes across different band measurements.

Visual UK Cup Size Guides

These guides explain how each UK cup size looks across different band sizes, with visual examples and measurement-based explanations.

Illustrated UK 34F bra size diagram

F Cups

 Illustrated UK 34FF bra size diagram

FF Cups

 Illustrated UK 34G bra size diagram

G Cups

 Illustrated UK 34GG bra size diagram

GG Cups

 Illustrated UK 34H bra size diagram

H Cups

 Illustrated UK 34HH bra size diagram

HH Cups

 Illustrated UK 34J bra size diagram

J Cups

 Illustrated UK 34JJ bra size diagram

JJ Cups

 Illustrated UK 34K bra size diagram

K Cups

 Illustrated UK 34KK bra size diagram

KK Cups

 Illustrated UK 34L bra size diagram

L Cups

 Illustrated UK 34LL bra size diagram

LL Cups

These images are simplified educational diagrams designed to show relative cup volume. Individual breast shape, body shape and bra style can all affect how a size appears in real life.

Compare Neighbouring Cup Sizes

Comparing neighbouring cup sizes side-by-side can make UK cup progression easier to understand. These guides explain the difference between nearby sizes in the UK bra sizing sequence.

F vs FF vs G G vs GG vs H H vs HH vs J J vs JJ vs K K vs KK vs L L vs LL

Browse Cup Sizes By Band Size

If you already know your cup size, these guides help you browse by band size and find more specific bra recommendations.

F Cup Bras FF Cup Bras G Cup Bras GG Cup Bras H Cup Bras HH Cup Bras J Cup Bras

Helpful Bra Sizing Resources

These core guides can help you measure, compare sizes and understand how UK bra sizing works.

Bra Size Calculator Bra Size Converter Bra Fitting Advice Bra Cup Size Guide Bra Cup Size Chart Bra Sister Sizes

Whether you are researching your current bra size or comparing larger UK cup sizes, these guides will help you understand cup volume, UK cup progression and how different bra sizes compare in real examples.

Bra sizing systems vary around the world, but most UK brands follow the standard UK cup progression shown above. If you would like to learn more about the history and development of bra sizing systems, see the Wikipedia article on bra sizing.