What does the Bra Size Calculator work out?

Band and cup size from two measurements. It is one of the Health & Fitness tools on Mondo Knows.

How is the Bra Size Calculator calculated?

You get an instant answer with the working shown underneath.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Bra Size Calculator

Band and cup size from two measurements. Use the free bra size calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Underbust

Bust

Mondo says

Suggested size

32D

Cup difference4.0 in

Sister size down30DD/E

Sister size up34C

A starting point only. Fit varies a lot between brands, so try before you buy.

Bra Size Calculator: common questions

What does the Bra Size Calculator work out?: Band and cup size from two measurements. It is one of the Health & Fitness tools on Mondo Knows.
How is the Bra Size Calculator calculated?: You get an instant answer with the working shown underneath.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.