CALTRX

Bra Size Calculator

Enter band and bust measurements to find your bra size.

Cup = bust - band
band= Underbust
bust= Full bust

Tips & Notes

  • ✓Measure with soft tape.
  • ✓Round band to nearest even.
  • ✓Try sister sizes.
  • ✓Sizing varies by brand.

Common Mistakes

  • ✗Measuring over padded bra.
  • ✗Wrong rounding.
  • ✗Assuming all brands match.
  • ✗Using wrong system (US vs UK).

Bra Size Calculator Overview

What This Calculator Does

Determines bra size from underbust (band) and bust measurements. Band rounds to nearest even number. Cup = bust minus band: 1"=A, 2"=B, 3"=C, 4"=D, 5"=DD.

Measurement Guide

Measure with soft tape. Band goes snugly around ribcage under bust. Bust measurement at fullest point. Stand straight, non-padded bra.

Sister Sizes

Equal cup volume, different bands. 34C = 36B = 32D. Try sister sizes if computed size feels wrong.

Variations

US, UK, EU sizing differ. This uses US. Brands also vary. Use as starting point.

Frequently Asked Questions

Same cup volume, different band. 34C=36B=32D.

This uses inches. Divide cm by 2.54.

The Bra Size Calculator uses standard validated formulas and provides results accurate to multiple decimal places. Review the step-by-step explanation to verify each calculation.

Yes, the Bra Size Calculator is fully responsive and works on all devices including smartphones, tablets, and desktop computers.