About Us

I’m Liza and created BraSizeCalculator.co to make finding your correct bra size simple, accurate, and stress free.

Most women never get measured properly, and many rely on confusing store charts that rarely match real body shapes. This site exists to fix that.

With years of experience working in the lingerie and fashion field, I’ve seen how the right fit can change posture, confidence, and comfort. That’s why every feature here from the main calculator to sister size and conversion tools is designed to give precise, data-based results that anyone can use at home.

Our calculator uses professional fitting standards used by brands in the US, UK, EU, France, and Japan. You only need your bust and band measurements to get a reliable size instantly. No sign-ups, no data stored, and no guessing.

This site is built for everyone whether you’re measuring for the first time, checking a size change, or comparing international labels.
Accuracy and privacy come first, and every tool is tested against real sizing references used by professional fitters.

What We Offer

Bra Size Calculator – Instantly find your accurate band and cup size.
Sister Size Tool – See equivalent sizes if your band feels too tight or loose.
Bra Size Converter – Convert sizes between US, UK, EU, FR, and JP standards.
Fitting Guides – Learn how to measure correctly and understand your results.

Our Mission

To make accurate sizing available to everyone, everywhere.
You shouldn’t have to guess or depend on inconsistent charts. With this tool, you get clarity, comfort, and confidence all from one simple calculation.