๐ Fashion & Sizing
Bra Size Calculator
Bra size comes from two numbers that look unrelated: the band is your underbust plus four or five inches, and the cup is the difference between bust and band. Measuring while wearing an unpadded bra gives the most repeatable result.
How it works
Underbust measurement
Bust measurement
Measurement unit
Band size
Cup size
Your bra size
Sister sizes
Bust minus band
Frequently asked questions
How do I use the Bra Size Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.