Measurement Guide · UK Sizing
How to Measure Your
Bra Size at Home
All you need is a soft measuring tape. Follow these steps to find your perfect UK bra size in under 2 minutes.
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Step-by-Step Guide
Works in both cm and inches — for all UK bra sizes.
1
Measure Your Underbust
This determines your band size (the number, e.g. 32, 34, 36).
- → Wear a non-padded bra or no bra
- → Wrap tape snugly under your bust, around your ribcage
- → Keep the tape horizontal — front and back at the same height
- → Breathe out and take the measurement
- → Record in cm (e.g. 76 cm) or inches (e.g. 30")
Tip: If your measurement falls between sizes, round up to the next even number.
2
Measure Your Bust
This determines your cup size (the letter, e.g. A, B, C, D, DD).
- → Lean slightly forward (45°) for accuracy
- → Measure around the fullest part of your bust
- → Keep the tape parallel to the floor
- → Don't pull the tape too tight or too loose
- → Record in cm or inches
Cup formula: Bust − Underbust = difference → determines UK cup letter.
3
Enter Your Measurements
Put your two measurements into our free UK bra calculator below and get your result instantly.
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UK Cup Size Difference Chart
The difference between your bust and underbust (in inches) determines your cup size.
| Difference (inches) | Difference (cm) | UK Cup Size |
|---|---|---|
| Less than 1" | Less than 2.5 cm | AA |
| 1" | 2.5 cm | A |
| 2" | 5 cm | B |
| 3" | 7.5 cm | C |
| 4" | 10 cm | D |
| 5" | 12.5 cm | DD |
| 6" | 15 cm | E |
| 7" | 17.5 cm | F |
| 8" | 20 cm | FF |
| 9" | 22.5 cm | G |
| 10" | 25 cm | GG |
| 11" | 27.5 cm | H |
UK vs US vs EU Bra Size Conversion
Convert your UK bra size to US, European, and French sizing.
| UK Size | US Size | EU Size | French Size |
|---|---|---|---|
| 30A | 30A | 65A | 80A |
| 32B | 32B | 70B | 85B |
| 34C | 34C | 75C | 90C |
| 36D | 36D | 80D | 95D |
| 38DD | 38DDD | 85E | 100E |
| 40E | 40DDD/F | 90F | 105F |
| 42F | 42G | 95G | 110G |
| 44FF | 44H | 100H | 115H |