Bra Size Converter
Convert your bra size between US, UK, EU, FR, AU, and JP sizing systems with sister-size suggestions.
Your measurements
Updates as you typeUnits
Measure in ?
Measurements
Underbust (band) ?
—
in
Bust (fullest) ?
—
in
Region
Show size for ?
How to measure (optional)
Open the step-by-step measuring guide
- Wear an unpadded, non-push-up bra — or no bra at all. Padding will skew the bust measurement upward.
- Stand upright in front of a mirror so you can keep the tape straight at the back.
- Band: wrap the tape snug under your bust, parallel to the floor. Exhale fully, then read.
- Bust: wrap the tape across the fullest point, loose enough to breathe. The tape should lie flat all the way around.
- Re-measure once for each number — small differences change your cup by a full letter.