EN 13402
The European standard for clothing size labels, which names a size by the body measurements it fits, in centimeters.
EN 13402 is the European standard for clothing size designation. Its idea is to label a garment by the body it fits, in centimeters, rather than by a size number that means something different in each country. Part 3, EN 13402-3, gives the measurements and intervals, and includes a rule for bra sizes.
On a size chart
For bras, EN 13402-3 uses two measurements:
- Band: the underbust, rounded to the nearest 5 cm. An underbust of 76 cm is a 75 band; a 75 band covers 72.5 to just under 77.5 cm.
- Cup: the bust minus the underbust. AA for 10 to 12 cm, then one letter per 2 cm: A 12 to 14, B 14 to 16, C 16 to 18, D 18 to 20, and so on.
An underbust of 76 cm and a bust of 93 cm: 93 - 76 = 17 cm, a C cup, so EU 75C. The usual conversions make that FR 90C, IT 3C, UK 34C, US 34C, AU 12C and JP C75. Its sister sizes, with about the same cup volume, are 70D and 80B.
Brand charts don't always follow the standard: a chart that counts its cups from the band number says 75D at 76 and 93 cm, where EN 13402-3 says 75C. Ruban Size's Bras and Maternity bras templates follow the standard, cup by cup. For a given bra, the brand's chart wins. Bra size conversion chart across 7 systems has the full tables.
In Ruban Size
On a bra chart, Find my size answers in the chart's own system, with the sister sizes. When the sizes aren't bra sizes, as on a sports bra chart from XS to XL, the answer adds "Your bra size from these measurements (EN 13402)" in all seven systems. The bra size calculator applies the same rule:
Bra size calculator full page and table
- EU
- 75B
- FR
- 90B
- IT
- 3B
- UK
- 34B
- US
- 34B
- AU
- 12B
- JP
- B75
Sister sizes (same cup volume): 70C and 80A in EU sizing. Band rounded to 5 cm, cup from the difference (EN 13402-3).
Read more
- How to measureHow to measure your bra sizeYour band is your underbust rounded to the nearest 5 cm. Your cup comes from your bust minus your underbust: AA from 10 cm, then one letter for every 2 cm.7 min
- Size conversionBra size conversion chart across 7 systemsA European 75C is 90C in France, 3C in Italy, 34C in the UK and the US, 12C in Australia and C75 in Japan. Bands convert by fixed rules; cup letters match up to D, then the UK and US letters part ways.6 min
- Sizing explainedBra sister sizes explainedSister sizes hold the same cup volume on a different band. Go one band down and one cup up, or one band up and one cup down: the sisters of a 34C are 32D and 36B.5 min
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