Use manual underbust and bust measurements with a visibly selected rounding convention.
Calculate with the Bra Size Calculator
Enter the values below. Required fields are checked before results are shown.
Bra Size Calculator results
How to use the Bra Size Calculator
- Select the requested method and measurement system where available.
- Enter measurements using the units shown in each label.
- Select Calculate or press Enter.
- Review the method, source, assumptions, limitations, and visible safety note.
Worked example
A 32 in underbust and 36 in bust produces a four-inch difference before the selected system’s cup sequence is applied.
Understanding the result
Treat the output as a starting reference for fit checks, not an exact fit guarantee.
Assumptions
- Measurements are taken level without compressing tissue.
Limitations
- Brand, style, shape, stretch, and measurement technique change fit.
- Sister sizes are approximate references.
Sources and method references
This calculator uses transparent arithmetic or user-entered classification assumptions documented above; no official medical classification is claimed.
Frequently asked questions
Will this size fit every brand?
The result is an educational estimate based on the selected method and entered assumptions. Individual measurements, needs, and outcomes vary.
Does CalculatorCheck store inputs from the Bra Size Calculator?
No. The calculation runs locally in your browser; entries are not saved, transmitted, or added to the page URL.
Is this medical or dietary advice?
No. It does not diagnose, treat, or prescribe for any condition.