How do I measure my band size?

Measure tightly around your ribcage directly under your chest. Keep the tape level.

What if I am between cup sizes?

Try the larger size first for comfort, or check the "sister size" equivalent.

How should a bra fit?

The band should be level and snug, and the cups should contain your breast tissue without overflowing or gaping.

WHOLE

CALCULATOR

Bra Size Calculator

Unit of Measurement

Centimeters (cm)

Bust Size (Fullest Part)

Band Size (Under Bust)

Bra Size Calculator: Find Your Perfect Fit & International Conversions

Our Bra Size Calculator is designed to help you find your most accurate bra size based on professional fitting standards. A well-fitting bra provides better support, posture, and comfort throughout the day.

Research suggests that up to 80% of women wear the wrong bra size, often choosing a band that is too large and a cup that is too small. This tool uses your Bust and Band measurements to estimate your size across various international systems.

We provide size estimates for the **United States (US/CA)**, **United Kingdom (UK)**, **European Union (EU)**, **France/Belgium/Spain**, and **Australia/New Zealand**.

Signs of a Poorly Fitted Bra

✓
The Band Rides Up
If the back band is pulling toward your shoulder blades, the band is likely too large. It should sit horizontal and low on your back.
✓
Cup Spillage
If your breasts spill over the top or sides (the 'quadraboob' effect), your cup size is likely too small.
✓
Gaping Cups
If there is space between the cup and your breast, the cup is either too large or the shape is not right for your physiology.
✓
Slipping Straps
While it can be a strap adjustment issue, it often means the band isn't doing its job of providing 80% of the support.