Bra fit calculator

Use Triumph’s method: measure firmly under the bust and loosely over the fullest bust. This estimates an EU starting size, not a guaranteed fit.

Under-bust (cm)

Bust (cm)

Starting size · Triumph chart

EU 75A · FR 90A

Band-label equivalents only: US/UK 34. Cup letters require the chosen brand’s conversion chart.

Source: Triumph international size chart. Shared cup-range endpoints use the larger cup in this estimate. Try on and check fit; other brands may use different methods.

Sister sizes

If the band feels tight, try one band up + one cup down (e.g. 34C → 36B) — same cup volume, looser band. If loose, try one band down + one cup up.

Full method: How to measure your bra size correctly.