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Bra Size Conversion

Bra size systems vary internationally. This guide provides conversion charts and tips for navigating different sizing standards.

International Bra Sizing Systems

Bra sizing systems differ significantly by country and region, and there is no comprehensive international standard. The most common systems include:

  • EU (European/International): Band size in centimeters (rounded to the nearest 5 cm), cups A-K. Cup size increases by 2 cm increments. Used in most of Europe and large parts of the world. See EN 13402 standard.
  • UK: Band size in inches, cups AA-L (with double letters like DD, FF, etc.). Cup size increases by 1 inch (2.54 cm). Band sizes are even numbers (28, 30, 32, ...).
  • US: Band size in inches, cups AA-M (inconsistent between brands). Cup increments are 1 inch, but cup lettering and band calculation methods vary widely. Some brands use D, DD, DDD, etc.; others use E, F, G, etc.
  • AU/NZ: Similar to UK, but with some unique cup progression and band labeling. Cup increments are 2 cm, but labeling can mix UK and EU conventions.
  • FR/BE/ES: Band size = EU size + 15 (e.g., EU 80 = FR 95). Cups as in EU system.
  • JP/KR: Band size in cm, rounded to nearest 5 cm. Cup increments are 2.5 cm (Japan) or 2 cm (Korea). Cup letters may start at AA or AAA.
  • IT: Band size = EU size - 15 (e.g., EU 80 = IT 65). Cups may use single or double letters, and increments can be 2 or 2.5 cm.

Conversion Pitfalls

  • Cup letters do not represent the same volume across systems. For example, a UK D cup is not the same as a US D cup or an EU D cup. The difference grows with larger cup sizes.
  • Band size numbers may not match in actual length. For example, a US 34 band is not the same as an EU 34 band.
  • Brand-specific charts are essential. Many brands have their own sizing scales, especially for larger cup sizes or specialty bras.
  • No international standardization. Even within a country, sizing can vary between brands and styles. Studies show that the label size often does not match the measured size.

Conversion Chart

Refer to brand-specific or reputable online conversion charts for the most accurate results. Here is a simplified example:

UK EU FR/BE US IT AU/NZ JP
32 70 85 32 2 10 70
34 75 90 34 3 12 75
36 80 95 36 4 14 80

Note: Cup letters must be cross-checked for each system. For example, a UK 34D ≈ EU 75D, but the cup volume may differ.

Measurement Methods

There are several ways to measure for a bra, and methods differ by country:

  • Underbust +0 (Modern): Band size is the snug underbust measurement, rounded to the nearest even number (inches or cm).
  • Underbust +4 (Traditional US/UK): Add 4 or 5 inches to the underbust measurement to get the band size. This method is now discouraged.
  • Overbust/Underarm: Some systems use a measurement above the bust or under the arms.
  • Cup size: Calculated as the difference between bust and band measurements. In the UK/US, each inch difference = 1 cup letter. In EU, each 2 cm difference = 1 cup letter.

See bra_sizes.md and bra_fitting_tips.md for more on measurement techniques.

Tips for Navigating International Sizing

  • Always try on bras when switching systems or brands.
  • Use sister sizing to find a comfortable fit if your exact size is unavailable or conversions are imprecise.
  • Consult professional fitters, especially if you have unique body proportions, breast asymmetry, or have experienced major body changes (pregnancy, weight change, surgery).
  • Be aware that up to 80% of women wear the wrong size, often due to band/cup confusion or brand differences.
  • The “Swoop and Scoop” method can help ensure a proper fit (see bra_fitting_tips.md).

Sister Sizing and International Conversion

Sister sizes are bra sizes with the same cup volume but different band sizes. This is especially useful when converting between systems or when your usual size is unavailable. For example, a UK 34C, 32D, and 36B have similar cup volumes. See sister_sizing.md for a full explanation, examples, and limitations.

Special Considerations

  • Asymmetry: Up to 25% of women have noticeable breast asymmetry. Some brands offer bras with different cup sizes for each breast.
  • Body changes: Menstrual cycles, pregnancy, weight changes, and age can all affect bra size. Re-measure regularly.
  • Fit issues: Poor fit can cause discomfort, back pain, and affect breast shape. See bra_fitting_tips.md and bra_sizes.md for troubleshooting.

Further Reading

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