Bra Size Calculator

Estimate an approximate bra band and cup size from underbust and bust measurements.

Preparing Bra Size Calculator

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Input

Enter the underbust and fullest-bust measurements in the same unit to get a starting bra size estimate. This tool shows the result instantly without step-by-step output.

Input summary

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How to use Bra Size Calculator

Provide the two measurements, and the calculator will estimate a likely band and cup combination as a starting point for fitting.

What this calculator is for

This calculator is for first-pass sizing when someone wants a starting bra size before trying on garments. It is not a substitute for fit testing because cut, brand, style, and body shape all affect comfort.

Tips

Take measurements while standing naturally and keep the tape level to avoid skewing the band estimate.
Treat the result as a starting size rather than a guaranteed final fit because sizing systems vary by brand and design.