Bra Size Calculator
Find a starting bra size from two body measurements: the band around your ribs under the bust, and the fullest part of the bust. Sizes vary by brand, so treat this as a first guess.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The band is the under-bust measurement in whole inches, rounded up to the next even number.
The cup comes from the bust minus the under-bust, in whole inches: 0 is AA, 1 is A, 2 is B, 3 is C, 4 is D, 5 is DD, and 6 or more is DDD.
Worked example
With an under-bust of 31 in and a bust of 36 in, the starting size is a 32 band with a DD cup.
Questions
Why does brand matter?
Each brand cuts its patterns a little differently, so the same size can fit one person well and another poorly. Try a few sizes on.
How should I measure?
Use a soft tape over light clothing. Measure under the bust, snug and level, then around the fullest part of the bust, and round to whole inches.
What if I fall between sizes?
Many people do. Pick the band that feels snug but comfortable, and check the cup holds the bust without spilling or gaping.
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