About Bra Size Calculator
This free browser-based tool estimates bra band and cup sizes from measurements, converts supported international labels, and compares sister sizes. It also provides illustrated measuring instructions and a checklist for evaluating a bra you have tried on.
How the estimates are produced
The calculator offers two-measurement and six-measurement methods. Read the published formulas and limitations, and use the result as a starting size for trying on a bra. No calculation can determine fabric stretch, cup shape or comfort from measurements alone.
Who operates this website?
Operator identity has not yet been published. This tool does not claim professional fitting certification or affiliation with the brands referenced in its guides.
Sources and corrections
Method references are linked in the calculation explanation. Brand measuring instructions are distinguished from this tool’s method. Use the contact page to report an error.