Approximate reference · Check the brand’s current chart
Bra size reference
Band label conversions using the ranges in Triumph’s international chart. Cup fitting methods differ; do not apply one bust-minus-under-bust formula across all markets.
| US | UK | EU | FR | AU | Under-bust (cm) |
|---|---|---|---|---|---|
| 30 | 30 | 65 | 80 | 8 | 63-67 |
| 32 | 32 | 70 | 85 | 10 | 68-72 |
| 34 | 34 | 75 | 90 | 12 | 73-77 |
| 36 | 36 | 80 | 95 | 14 | 78-82 |
| 38 | 38 | 85 | 100 | 16 | 83-87 |
| 40 | 40 | 90 | 105 | 18 | 88-92 |
| 42 | 42 | 95 | 110 | 20 | 93-97 |
| 44 | 44 | 100 | 115 | 22 | 98-102 |
Measure under-bust first
Follow Triumph’s firm under-bust measuring method when using these ranges. For example, 73–77 cm maps to EU 75, US/UK 34 and FR 90. Other fitting methods may differ.
Then measure across the bust
Use the chosen manufacturer’s bust ranges for the selected band. The same bust-minus-under-bust calculation does not determine cups in every sizing system.
Cup conversions need a brand chart
UK and EU cup naming commonly diverges after D. US naming also varies by manufacturer. Consult the current brand’s cup-conversion chart.
Sister sizing
If a band is too tight, go up one band and down one cup (e.g. 34C → 36B) to maintain a similar cup volume.
Common questions
- Why does my US 34B feel different in a UK brand?
- Band labels may match, but cup shape, stretch and construction can differ. Use the brand’s chart and check actual fit.
- Is a French 90 the same as EU 90?
- No. French sizing is offset by 15 — a French 90 is an EU 75. The under-bust measurement column is the safest reference across both.