1. Enter the exact number on your tape
Don't round your measurement. Enter exactly what you measure in inches or centimetres, we'll do the calculation for you.

2. Measure your underbust snugly
Wrap the tape directly underneath your bust, keeping it level around your body. It should feel snug, but shouldn't dig into your skin.

3. Measure your bust at the fullest point
Wrap the tape around the fullest part of your bust. Keep it level and relaxed without compressing your breasts. For the most accurate result, wear an unpadded bra or no bra.

Using inches?
Enter the exact measurement shown on your tape. If your underbust falls on an odd number or between band sizes, we'll automatically round it to the nearest even band size for you.