Bra Size Calculator

Find your correct bra size using band and bust measurements for a comfortable fit.

Bra Size Calculator

Estimate bra size based on US System.

Underbust / Band (in)

Measure snug around your ribcage, directly under the bust.

Bust Measurement (in)

Measure loosely around the fullest part of your chest.

Enter your measurements to see your result here.

Understanding the Bra Sizing Guide

Wearing the correct bra size is essential for comfort, support, and health. An estimated 80% of women wear the wrong bra size. Proper measurement is the first step toward finding your perfect fit.

Guide

How to use the Bra Sizing Guide

1Measure your underbust: Wrap the tape snug around your ribcage directly under your bust.
2Measure your bust: Wrap the tape loosely around the fullest part of your chest.
3Enter both measurements in inches into the calculator.
4Click 'Calculate Size' to see your recommended band and cup size.
5Note: This provides a baseline; fit can vary significantly between brands and styles.

Applications

Common Use Cases

Finding a baseline size before shopping for new lingerie or sports bras.

Checking if your size has changed after weight fluctuations or pregnancy.

Helping friends or family members find their correct measurements.

The Maths Behind the Calculation

Cup Size = Bust - Band

Generally, each inch of difference between bust and band corresponds to one cup size (1" = A, 2" = B, 3" = C, etc.).

Knowledge Base

Frequently Asked Questions

What is 'Sister Sizing'?

Sister sizes are bra sizes where the cup volume is the same, even though the band and cup letters are different. For example, a 34C is a sister size to a 32D and 36B.

How often should I measure?

Professionals recommend measuring every 6 to 12 months, as body shape can change due to age and weight shifts.

Why does the band feel too tight?

If the band is too tight, it might actually be because the cups are too small. Try the bra on upside down and backwards; if the band feels fine then, you probably need a larger cup.

Regional Notice: United States

"Federal tax estimates are based on 2024 brackets. Consult a tax professional for official filing."