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Bra size calculator

Find your bra size in US, UK, and EU sizing from a band and bust measurement, plus your sister sizes for when a size is out of stock.

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Measurement system
Band measurement under bust
in
Bust measurement fullest part
in

Enter your measurements, then calculate — your size in each system will appear here.

US
UK size
EU size
Sister sizes

How to measure

Getting an accurate result

Band (under bust)

Measure directly under your bust, around your ribcage. Keep the tape snug and level.

Bust (fullest part)

Measure around the fullest part of your bust while wearing an unpadded bra. Keep the tape level.

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FAQ

Common questions

What are "sister sizes"?
Different band/cup combinations with roughly the same cup volume — going up one band size and down one cup letter (or vice versa) gives a similar fit with a different band tightness, useful when your exact size isn't in stock.
Why do UK and EU cup letters differ from US?
Cup-letter conventions diverge above D — UK sizing uses DD, E, F, FF, G and beyond, while the US convention often doubles or triples letters (DDD) instead. The conversion accounts for this rather than assuming the letters mean the same thing everywhere.
Is my data sent anywhere?
No. The calculation runs entirely in your browser — nothing is transmitted, logged, or stored.
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Bra Size Calculator

Our Bra Size Calculator helps you find your perfect bra size using accurate measurements. This tool provides US, UK, and EU sizes along with sister sizes for a comprehensive fit.

How to Use the Bra Size Calculator

1. Select Your Measurement System

  • Choose between Inches or Centimeters
  • The calculator will adjust input fields based on your selection

2. Enter Your Measurements

  • Band Measurement (Under Bust): Measure directly under your bust, around your ribcage. The tape should be snug and level.
  • Bust Measurement (Fullest Part): Measure around the fullest part of your bust while wearing an unpadded bra. Keep the tape level.

3. Calculate Your Bra Size

  • Click the "Calculate Size" button
  • Your US, UK, and EU bra sizes along with sister sizes will be displayed instantly

Understanding Bra Sizes

US, UK, and EU Sizes

  • US Size: Standard bra size used in the United States
  • UK Size: Standard bra size used in the United Kingdom
  • EU Size: Standard bra size used in European countries

Sister Sizes

  • Sister sizes are alternative bra sizes that offer a similar fit
  • They are useful for finding a comfortable fit if your usual size is unavailable

Use Cases

1. Personal Bra Fitting

  • Find your perfect bra size for comfort and support
  • Explore sister sizes for alternative fits
  • Use for online shopping to ensure accurate sizing

2. Retail and Fashion

  • Assist customers in finding their correct bra size
  • Provide comprehensive sizing information for international customers
  • Integrate into e-commerce platforms for enhanced customer experience

3. Educational Purposes

  • Teach students about bra sizing and fitting
  • Demonstrate the importance of accurate measurements
  • Use in fashion and design courses

Technical Features

  • Dynamic Input Fields: Adjusts based on selected measurement system
  • Real-Time Calculation: Instant results upon input
  • Responsive Design: Works on mobile, tablet, and desktop devices
  • Measurement Guide: Provides clear instructions for accurate measurements
  • No Data Storage: All calculations performed locally in your browser

Why Use Our Bra Size Calculator

1. Accurate and Reliable

  • Uses standard bra sizing methods
  • Provides precise results with detailed size options

2. User-Friendly Interface

  • Simple and intuitive design
  • Clear instructions and labels
  • Instant feedback with comprehensive size options

3. Privacy Focused

  • No personal data collection
  • Works offline after initial page load
  • Safe and secure for all users

Tips for Accurate Measurements

  1. Use a Soft Measuring Tape

    • Ensure the tape is snug but not tight
    • Keep the tape level around your body
  2. Measure While Wearing an Unpadded Bra

    • Provides the most accurate bust measurement
    • Avoids distortion from padded bras
  3. Double-Check Your Measurements

    • Measure twice for accuracy
    • Record measurements immediately

Remember: Bra sizes can vary between brands and styles. Use this calculator as a guide and try on different sizes to find the best fit for you.