👙 Bra Size Calculator
Find your perfect bra size with our accurate calculator. Get measurements for US, UK, EU, and other international sizing standards with sister size recommendations.
Your Recommended Bra Size
Sister Sizes
These sizes have the same cup volume but different band sizes:
International Sizing
| Region | Size |
|---|
Fitting Checklist
The band should be level and snug - you should be able to slide only one finger underneath
The cups should contain all breast tissue without spillage or gaping
The center panel should lie flat against your chest
Straps should stay in place without digging in or falling down
Frequently Asked Questions
Our calculator uses standard industry formulas and provides a good starting point for finding your bra size. However, we recommend trying on bras as sizing can vary between brands and styles.
The traditional method adds 4-5 inches to your underbust measurement, while the modern method uses your actual underbust measurement. We offer both options as different brands may use different sizing systems.
Sister sizes are bra sizes with the same cup volume but different band sizes. For example, 34C, 32D, and 36B are sister sizes. This gives you more options if your exact size isn't available.
We recommend measuring every 6-12 months or after significant weight changes, pregnancy, or hormonal changes that might affect your breast size.
Bra sizing systems evolved differently in various countries. US and UK use inches, while EU uses centimeters. Our calculator converts between these systems to help you find the right size internationally.
Try sister sizes first. If issues persist, consider that different bra styles (push-up, sports, wireless) may require different sizes. Professional fitting is always recommended.
Yes, but keep in mind that breast size changes frequently during pregnancy and breastfeeding. You may need to remeasure more often during these periods.
Measure while wearing a non-padded, well-fitting bra. Keep the measuring tape level and snug but not tight. Take measurements at the same time of day for consistency.
Important Disclaimer
This calculator provides estimates based on standard sizing formulas. Results are for reference only and should not replace professional fitting. Different brands may have varying size standards. We recommend trying on bras before purchasing and consulting with professional fitters for the best results. Individual body shapes and preferences may require adjustments from calculated sizes.