International Bra Size Conversion Chart

Bra sizes combine a band (underbust) and a cup (bust minus underbust), and both parts change between countries. US and UK bands are in inches (32, 34, 36); EU bands are underbust in centimetres rounded to 5 (70, 75, 80); France and Spain add 15 to the EU number (85, 90, 95); Australia uses the UK band minus 2 dress-size style numbers (10, 12, 14). Japan and Korea use the EU centimetre band with their own cup letters.

Cups are where most conversions go wrong. US cups go A, B, C, D, DD, DDD, G; UK cups go A, B, C, D, DD, E, F, FF, G; EU cups go A, B, C, D, E, F, G. A US DDD is a UK E and an EU F. To measure, take a snug underbust in centimetres and a loose bust at the fullest point. The difference in cm divided by 2.5 gives the cup steps: 13 cm is about a D cup in most systems. Band sizes should be tight on the loosest hook when new.