Bra Size Calculator | Rubies Lingerie

Bra Size Calculator

Enter your measurements and we'll find your perfect fit — in UK sizing (the same used across our range).

Units:

Measure directly under your bust, keeping the tape snug.

Measure around the fullest part of your bust, loosely.

How to measure yourself

1

Get a soft measuring tape

Use a dressmaker's tape — not a stiff ruler. Measure in your bra or topless.

2

Measure your underbust

Wrap the tape directly under your bust, on top of your ribcage. It should be snug but not tight. Note the number in inches or cm.

3

Measure your bust

Wrap the tape around the fullest part of your bust. Let it sit loosely — you should be able to slide two fingers underneath.

4

Enter & calculate

Enter both measurements above and tap "Calculate". We'll give you your UK size instantly.

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