Bra Size Calculator
Use simple body measurements to estimate your bra size, cup size, and sister size. Then, use the result as a starting point for better comfort.
Calculator Preview
Measure. Calculate. Understand.
The FitMyBra bra size calculator helps you estimate your band size, cup size, and sister size. It gives a starting size, not a final rule. Your best fit can also depend on bra style, body shape, and comfort.
How to Measure Before You Start
Use a soft measuring tape. Also, keep the tape flat and close to your body.
Calculate Your Bra Size
Enter your band and bust measurements. Then, click calculate to see your starting size.
This calculator gives an estimate. So, use it as a helpful starting point, not a final rule.
Estimated Size
Enter your measurements to see your starting bra size.
More Fit Calculators
Use more simple tools to understand your size, sister sizes, cup fit, and bra comfort. Also, new calculators can be featured here later.
Sister Size and Size Converter
After you get your size, these small tools help you compare nearby sizes.
Sister Size Calculator
Sister sizes have similar cup volume with a different band size.
Bra Size Converter
Use this simple guide to compare common US, UK, and EU band sizes.
Does Your Bra Fit Right?
Choose the problem you notice most. Then, read a simple next step.
What to Do Next
If your result feels confusing, these pages can help.
Bra Size Calculator Questions
Simple answers about measuring, sizing, and fit.
Start With Your Size. Then Find Your Comfort.
Use the calculator, compare sister sizes, and read the size guides if you need more help.