Bra Size Estimator

Bra Size Chart – Band & Cup Size Conversion Guide

Understanding bra size conversions across different countries can be confusing. Our comprehensive charts and measuring guide help women worldwide interpret sizes from US, UK, EU, AU, and more — empowering you to find the perfect fit anywhere.

Band Size Conversion Chart

US/UK Band EU Band (cm) AU Band FR Band (cm)
28 60 10 65
30 65 12 70
32 70 14 75
34 75 16 80
36 80 18 85
38 85 20 90
40 90 22 95

Cup Size Conversion Chart

US/UK EU FR/BE IT
AA A A 0
A B B 1
B C C 2
C D D 3
D E E 4
DD (E) F F 5
DDD (F) G G 6

Combined Size Chart (Example Conversions)

US Size UK Size EU Size AU Size French Size
32B 32B 70B 10B 85B
34C 34C 75C 12C 90C
36D 36D 80D 14D 95D
38DD 38DD 85E 16E 100E
40DDD 40F 90F 18F 105F

Plus-size and Sister-sizing Guidance

Sister sizes are bra sizes with the same cup volume but different band sizes. For example, if 34D feels tight in the band, try 36C or 32DD for a better fit. Plus-size bras offer the same style variety but with extended band and cup sizes to accommodate fuller figures comfortably.

When sizing up or down, remember the band and cup size must balance to give correct support. Our conversion charts help you navigate these alternatives across sizing systems.

How to Measure Your Bra Size

To find your true bra size, accurate measuring is critical. Use a soft tape measure and:

  1. Measure your band size: Wrap the tape snugly around your ribcage, just under your bust. Ensure the tape is parallel to the floor.
  2. Measure your bust size: Measure around the fullest part of your bust, keeping the tape straight but not tight.
  3. Calculate your cup size: Subtract your band measurement from your bust measurement (in the same units). The difference corresponds to your cup size.

Frequently Asked Questions

Sister sizes are alternative sizes with equivalent cup volume but different band sizes, providing an option for better fit if your usual size is uncomfortable.
Different manufacturers use slightly different sizing standards, measurement rounding, and fit models. Country sizing systems also differ due to market norms and measurement units.
Measuring every 6-12 months is recommended, or whenever you have weight changes, pregnancy, or lifestyle changes affecting your body.

Bra Size Conversion & Fitting Tips

Bra size conversion helps women navigate various international sizing systems, such as US, UK, EU, and Australian sizes. Because each system uses different units and sometimes increments, understanding these conversions is essential for online shopping or when buying from foreign brands.

Common fitting problems arise from differences in band tightness, cup volume, or shape suitability. Always start with accurate measurements and consult conversion charts to minimize guesswork. Remember, your comfort depends on both correct sizing and bra style.

For best results, measure yourself regularly and use tools like our Bra Size Calculator to verify your size in your preferred system.

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