Better fit, less guesswork.
whatsmybra.com helps you find a comfortable starting size and understand why it works.
Our story
whatsmybra.com started with a simple frustration: bra sizing felt like a secret nobody would explain. Tapes, charts and fitting rooms all gave different answers, and most of us just guessed.
We believe nobody should have to guess their size. A good fit is simple once someone explains it clearly.
What we stand for
Clear
Plain language, no jargon, no judgment.
Kind
Every body is different. We help you find what works for yours.
Honest
Sizes are a starting point. We say so, and show you how to check.
Common questions
How accurate is the calculator?
It gives a starting point. Brands differ, so use the fit checklist.
Do you store my measurements?
No. The calculator runs entirely in your browser — your measurements are never sent to us or stored anywhere.
Can I try sister sizes?
Yes, they are shown with every result.
Do you sell bras?
No. We're an independent guide — we don't sell bras or take commissions, so our advice stays unbiased.
Contact us
Questions, feedback or ideas? We read every message.
Email: hello@whatsmybra.com
Response time: we reply within two working days.