A simple question — what bra size am I actually wearing? — shouldn't require an awkward conversation, a paid fitting, or a passport. So we built a place where anyone, anywhere, can find out for free.
Getting measured for a bra is often the only piece of clothing sizing that still requires another person, a store visit, and a conversation many people would rather avoid. For a lot of women, that conversation has meant discomfort, judgment, or simply being brushed off — and for many more, it's meant no conversation at all, because there was nowhere private or reliable to ask.
We looked for a platform that solved this properly, for everyone, everywhere — and kept coming up short. What existed was scattered: a size chart here, a single country's convention there, a calculator built for one market that quietly assumed the rest of the world didn't exist. Someone in Mumbai, Manila or Melbourne was left converting numbers by hand, guessing, or simply going without an answer.
That gap didn't sit right with us. If we have the ability to build something that helps people — genuinely, practically, at no cost — then not building it felt like the wrong choice. So we did.
Most sizing tools are written for a single market and stop there. We built Bra Size the other way around: every calculator on this site works across US, UK, EU, Indian, Australian and Japanese conventions from the start, because a woman's need to know her size doesn't depend on which country she happens to live in. This site exists for all of them — the same accurate math, the same respect, regardless of where you're reading this from.
Every woman deserves a bra that fits comfortably, supports her body, and helps her feel confident — without paying for the privilege of finding that out. That's the whole idea behind Bra Size: accurate calculators, honest measuring guides, and clear reference charts, kept free, kept private, and kept judgment-free, for as long as we're able to run this.
Nothing you type into any calculator on this site is stored or sent anywhere — you don't need an account, an email address, or anyone's permission to use it. We'd rather build something useful and give it away than gate a basic need behind a login screen.
It is not a substitute for an in-person fitting, a medical device, or a diagnostic tool. It gives a mathematically sound starting estimate from the two measurements you provide. Please read our disclaimer for the full picture.
Bra Size is part of the Calculations.one family of single-purpose calculators. We keep each site small, fast, private by design, and free of unnecessary sign-ups.
Spotted an error, or have a suggestion? Visit our contact page — we read every message ourselves.