1
Measure Your Under Bust
Wrap the tape firmly under your bust, directly on your ribcage. The tape should be snug and horizontal — not slanting up at the back. This measurement (in cm or inches) gives you your band size.
Free · UK Standard Sizing · Instant Results
Find Your Perfect
UK Bra Size
Enter your two measurements below and get your accurate UK bra size in seconds — plus your EU equivalent, sister sizes, and personalised fitting tips. Works in cm or inches.
Free foreverNo sign-upUK + EU sizes
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UK Bra Calculator
Two measurements. Ten seconds. Your exact UK bra size — plus EU equivalent and fitting tips.
Enter Your Measurements
Measure snugly around your ribcage, directly under your bust.
Measure around the fullest part of your bust, keeping the tape level.
You'll get your UK size, international equivalents, sister sizes, and fitting tips.
How to Measure Your Bra Size
You only need a soft measuring tape. Here is exactly where to measure.
2
Measure Your Full Bust
Measure around the fullest part of your bust — usually across the nipple line. The tape should be parallel to the floor and comfortably snug. This measurement, combined with your underbust, determines your cup size.
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UK Bra Size Chart
UK band sizes 28–44 with all available cup sizes. Cells show standard UK sizing as stocked by most retailers.
| Band Size (UK) | EU Band (cm) | Cup Sizes Available |
|---|---|---|
| 28 | 70 | 28AA28A28B28C28D28DD28E |
| 30 | 75 | 30AA30A30B30C30D30DD30E30F |
| 32 | 80 | 32AA32A32B32C32D32DD32E32F32FF |
| 34 | 85 | 34A34B34C34D34DD34E34F34FF34G |
| 36 | 90 | 36A36B36C36D36DD36E36F36FF36G36GG |
| 38 | 95 | 38B38C38D38DD38E38F38FF38G38GG38H |
| 40 | 100 | 40C40D40DD40E40F40FF40G40GG40H40HH |
| 42 | 105 | 42D42DD42E42F42FF42G42GG42H42HH42J |
| 44 | 110 | 44D44DD44E44F44FF44G44GG44H44HH44J44JJ |
EU cup letters differ from UK — UK DD = EU E, UK E = EU F, and so on. See the full conversion table.
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Bra Size FAQ
The most common questions about UK bra sizing — answered simply.
How do I measure my bra size in the UK?+
To find your UK bra size: wrap a soft measuring tape firmly under your bust (on your ribcage) — that gives your band size. Then measure around the fullest part of your bust. Enter both numbers into our UK bra calculator and it works out your size instantly. You can measure in cm or inches.
What is a UK bra sister size?+
Sister sizes are alternative UK bra sizes that have the same cup volume but a different band length. For example, 34D, 36C and 32E are all sister sizes — the cup holds the same amount, only the band length changes. If your exact size is sold out, a sister size will feel similar.
What is the difference between UK and EU bra sizing?+
UK bra bands are measured in inches (28, 30, 32...) while EU sizes use centimetres (60, 65, 70...). UK cup letters also differ from European ones — UK DD = EU E, UK E = EU F, and so on. Our calculator shows both your UK and EU equivalent size.
How often should I remeasure my bra size?+
Bra fitting experts recommend remeasuring every 6 to 12 months, or whenever you notice a significant weight change, after pregnancy, or after surgery. Up to 80% of UK women are wearing the wrong size, so it's worth checking regularly.
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