Bra Size Calculator

- May 09, 2025
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Find your perfect bra size with this calculator. Accurate measurements lead to better comfort and support. For best results, measure while wearing a non-padded bra or no bra.

Measurement System

Your Measurements

Band Size Measurement Full Bust Measurement Measure directly under bust, keeping tape snug and level Measure around the fullest part of your bust Tips for Accurate Measurements: • Stand straight with arms relaxed at sides • Keep measuring tape parallel to the floor
How to Take Accurate Measurements
  1. Wear a non-padded bra or no bra for the most accurate measurements.
  2. Band/Underbust: Measure directly under your bust where a bra band would sit. Keep the tape measure snug and parallel to the ground.
  3. Full Bust: Measure around the fullest part of your bust (typically at nipple level). Keep the tape measure parallel to the ground.
  4. Stand straight with your arms relaxed at your sides during both measurements.
  5. Take each measurement twice to confirm accuracy.
inches
Measure directly under your bust, making sure the tape measure is snug and level all the way around.
inches
Measure around the fullest part of your bust, keeping the tape measure parallel to the floor.

Additional Factors

Fitting Preferences

Advanced Options

Understanding Bra Sizing

Bra sizes consist of a band size (number) and a cup size (letter). The band size indicates the measurement around your ribcage, while the cup size represents the difference between your band and bust measurements.

How Bra Sizing Works

Bra sizing varies by region, but generally follows these principles:

  • Band Size: Usually derived from your underbust measurement, possibly with some adjustment.
  • Cup Size: Calculated from the difference between your full bust and band measurements.
Sister Sizes

Sister sizes have the same cup volume but different band sizes. For example, 34C, 32D, and 36B are all sister sizes. This is useful when you need to adjust the band size without changing the cup volume.

International Sizing

Different countries use different sizing systems:

  • US/UK: Uses inches for measurements and cup sizes AA, A, B, C, D, DD, etc.
  • EU: Uses centimetres and cup sizes A, B, C, D, E, F, etc.
  • France: Similar to EU but with different cup progressions.
  • Italy: Uses numbers for both band and cup (e.g., 1, 2, 3, 4).
Signs of a Good Fit

A properly fitting bra should have the following characteristics:

  • The band sits parallel to the floor and feels snug but not tight.
  • The centre gore (the part between the cups) sits flat against your sternum.
  • The cups fully contain your breast tissue without any spillage or gaps.
  • The straps don't dig into your shoulders or fall down.
  • The wire (if present) sits at the base of your breast and follows your natural contour.
Measuring Tips
  • Measure yourself while wearing a non-padded bra or no bra.
  • Keep the measuring tape parallel to the floor.
  • For the most accurate results, have someone help you measure.
  • Take measurements twice to confirm accuracy.
  • Remember that bra sizing is just a starting point - always try on bras before purchasing.

Understanding the Bra Size Calculator

The Bra Size Calculator is a handy tool designed to help you find the perfect fit for your bras. It uses your measurements to determine both your band and cup size. Accurate bra sizing can improve your comfort, support, and overall confidence. Knowing your correct size means you can enjoy a better-fitting bra that feels just right.

How to Measure for Accurate Results

To ensure the best results, it's essential to take your measurements correctly. You should wear a non-padded bra or no bra at all. Stand straight with your arms relaxed and use a soft measuring tape. Measure your underbust and the fullest part of your bust. Here are some tips:

  • Keep the tape tight but not overly snug.
  • Measure around the fullest part of your bust, ensuring the tape is parallel to the floor.
  • Take each measurement twice for accuracy.

Selecting the Right Measurement System

The calculator allows you to choose between two measurement systems: inches or centimetres. This means you can select the system you're most comfortable with. If you're in the UK or the US, you might prefer inches. However, if you're in Europe, centimetres could feel more natural for you. This flexibility makes it easier for everyone to get their size right.

Your Size Results Explained

Once you've entered your measurements, the calculator provides your recommended bra size. This will include both your band size and cup size. Additionally, it shows sister sizes which can be useful if your recommended size doesn't fit perfectly. Sister sizes can help you find a good fit without changing cup volume. For example, if you’re a 34C, you might also try a 32D or a 36B.

Customising Your Experience with Additional Factors

The calculator offers options to customise your results based on your personal preferences. You can select your current bra size and body frame type. Knowing whether you prefer a tighter or looser band can also help in finding the best fit. Considering these factors ensures the calculator tailors the results to your body shape and style.

Understanding Bra Sizing Basics

Bra sizing is generally made up of two components: the band size and the cup size. The band size reflects your underbust measurement, while the cup size indicates the volume difference between your bust and band measurements. It's helpful to know that sizing can vary by region, leading to different numeral systems and letters used for cup sizes. Understanding these basics can make your bra shopping experience smoother.

Common Fit Issues and Their Solutions

Even with the right size, some fit issues can arise. Problems such as the band riding up, spillage over the cups, or discomfort in the straps are common. Here are some potential solutions:

  • Adjust the strap length to improve comfort.
  • Try a different cup size for better coverage.
  • Consider changing the band size if it feels too loose or too tight.

The Benefits of a Well-Fitting Bra

Wearing a properly fitting bra isn’t just about comfort; it can also enhance your overall appearance. A good bra provides support, helps maintain your posture, and makes clothes fit better. By using the Bra Size Calculator, you can ensure that you're wearing a bra that offers the support you need while feeling great. This small step can make a big difference in your daily life.