Our 'pop-up' measuring system will magically work out your first bra size, follow Miss Dolly's instructions on the right.
Stuck? Read our handy tips on how to know if your first bra fits properly.
All you need are two measurements so grab a tape measure and a helpful friend - this could even be your mum!
Measure in inches or centimetres to the nearest ½
1. measure around chest across the nipples
2. measure around rib cage, just under your breasts
Miss Dolly says “Keep the tape measure snug to your body”
Enter measurement 1 into box 1
Measurement 2 into box 2
Click submit. Magically your “Sweetling” bra size will appear