Bra Measurement Chart & Size Reference
Take two level circumference measurements before using any band or cup conversion.
Illustrative band-label comparison — not the US/UK fitting calculator
The centimeter underbust intervals below follow a Wacoal Singapore/Japanese-style reference, paired with illustrative US/UK and EU band labels. They are not the US Knix or UK Brastop underbust formulas used by our calculator. Do not use this cross-reference to derive a cup size or assume identical fit across brands. Source: Wacoal Singapore guide.
| Underbust | US | UK | EU |
|---|---|---|---|
| 68–72 cm | 32 | 32 | 70 |
| 73–77 cm | 34 | 34 | 75 |
| 78–82 cm | 36 | 36 | 80 |
| 83–87 cm | 38 | 38 | 85 |
| 88–92 cm | 40 | 40 | 90 |
| 93–97 cm | 42 | 42 | 95 |
Band-label methods differ across makers. These are printed band references, not the actual underbust-to-band mapping of Knix or Brastop. For a starting physical measurement use the source-specific calculator.
Illustrative cup-letter sequence (not a fitting formula)
| Example inch step (not paired with band table) | US | UK |
|---|---|---|
| 1 in / 2.5 cm | A | A |
| 2 in / 5 cm | B | B |
| 3 in / 7.5 cm | C | C |
| 4 in / 10 cm | D | D |
| 5 in / 12.5 cm | DD/E | DD |
| 6 in / 15 cm | DDD/F | E |
The cup rows are illustrative US/UK naming examples, not a verified measurement-to-size chart for either Knix or Brastop. Larger cup letters, labels like DD/E and complete US ↔ UK bra sizes are brand/system dependent. Never combine these rows with the centimeter band comparison to compute a fitted size.
Measure before converting
Take snug underbust and fullest-bust measurements with the tape level, then use those values to select the first sizes to try.
The calculation is a starting point. Band support, cup containment, wire placement and shape match are the final fit checks.
How this guidance is checked
These sources support the measurement method and help check real-world variation. They are not presented as one universal brand-size table.
- Bra Fit Calculator — Wacoal. Bra measurement cross-check using underbust and fullest-bust measurements and brand-specific fitting logic.
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