---
license: cc-by-4.0
language:
- en
pretty_name: Bra size conversion (UK, US, EU, FR, AU/NZ, JP)
size_categories:
- n<1K
tags:
- tabular
- fashion
- sizing
configs:
- config_name: bands
  data_files: bands.csv
- config_name: cups
  data_files: cups.csv
- config_name: brand_chart_checks
  data_files: brand-chart-checks.csv
---

# Bra size conversion (UK, US, EU, FR, AU/NZ, JP)

Lookup tables for converting a bra size label between six systems, built for size normalisation in product catalogues and fit tools.

- `bands`: 11 UK/US bands (28 to 48) with EU, French, AU/NZ and Japanese labels and the underbust range in inches and centimetres that rounds to each band.
- `cups`: 16 cup steps (2.5 cm of bust minus underbust per step) with UK, US, EU/FR, AU/NZ and approximate Japanese letters. Empty cells mean the step is outside the table.
- `brand_chart_checks`: 7 brand charts (Victoria's Secret, Wacoal America, Freya, Elomi, Marks & Spencer, Berlei, SKIMS) compared with these tables, and where they differ.

Two things that trip up naive conversion code: the UK and US letters split after DD (UK E = US DDD = EU F), and AU/NZ letters above F depend on the brand.

Source: the [Bra Atlas international size chart](https://braatlas.com/international-bra-size-chart/), updated 13 October 2026. GitHub copy: [RaiAnsar/bra-size-conversion-chart](https://github.com/RaiAnsar/bra-size-conversion-chart).

Licence: CC BY 4.0, credit "Bra Atlas (braatlas.com)".