Bra Size Calculator
Find your bra size from band and bust measurements in US, UK and EU sizing.
Enter your values to see the result.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Bra Size Calculator
Find your bra size from band and bust measurements in US, UK and EU sizing.
- 1 Choose centimeters or inches.
- 2 Measure snugly under the bust and loosely around the fullest point.
- 3 Read your size and the sister sizes.
Example and practical tips
An underbust of 30 in and bust of 36 in suggests a 30DD in US sizing.
Frequently asked questions
What are sister sizes?
Sizes with the same cup volume on a different band, such as 32C and 34B. Try them when the band fits badly.
Why do brands fit differently?
Sizing is not standardized, so always check the brand’s own chart and try before buying where possible.
Report an issue
Something broken or not quite right? Tell us and we will look into it.