Bra Size Calculator
Estimate your bra size from under-bust band and fullest bust measurements.
Results
Calculated Band Size
-
Cup Size
-
US Size
-
UK Size
-
What is Bra Size?
Bra size consists of a band size (the circumference under the bust) and a cup size (the volume of the breast). Proper sizing ensures comfort and support.
How to Use This Calculator
- Measure your under-bust circumference in inches for the band size.
- Measure the fullest part of your bust in inches.
- Click "Calculate Bra Size" to see your estimated US and UK sizes.
Frequently Asked Questions
How is band size determined?
Band size is your under-bust measurement rounded to the nearest even number. If odd, round up to the next even number.
How is cup size calculated?
Cup size is based on the difference between bust and band measurements: 1"=A, 2"=B, 3"=C, 4"=D, 5"=DD, 6"=E, 7"=F, 8"=G.
What is the difference between US and UK sizes?
US and UK band sizes are the same. Cup sizes diverge after DD: US DDD = UK E, US G = UK F, etc. This calculator provides standard conversions.
Is this a substitute for a professional fitting?
No, this is an estimation tool. For best results, visit a professional fitter or try multiple sizes and brands.