Bra Size Converter
Convert measurements into band and cup labels and compare international systems in one view.
Prefer a dedicated experience? Use the CM converter or switch to the IN converter
Convert your bra size in seconds
Choose centimetres or inches, add your snug underbust and bust numbers, then review the suggested band, cup, and sister sizes.
Bra Size Calculator
Advanced Mode (ABTF-style)
Use snug/tight underbust and standing/leaning/lying bust to get a recommended try-on range and style tips.
Measurement Guide
Band Size
Measure around your ribcage, just below your breasts. The tape should be snug but not tight.
Bust Size
Measure around the fullest part of your breasts, keeping the tape measure parallel to the floor.
Why this converter
- Calculate band, cup, and sister sizes from two measurements.
- See US, UK, EU, FR, JP, and AU labels without extra math.
- Copy results or dive deeper into specialist converters in one click.
Related tools
Understand how double letters map between American and British cup systems.
Browse comparison charts and fitting advice by region.
Jump to nearby sizes to fine-tune band tension or cup depth.
Global conversion chart
Preview the cross-system table used by our calculator for quick reference.
Global Size Conversion
| US/UK | EU | FR | IT | JP | AU/NZ | DE | PK | IE | ZA |
|---|---|---|---|---|---|---|---|---|---|
| 28A | 60A | 75A | 1A | 65A | 6A | 60A | 28A | 28A | 28A |
| 28B | 60B | 75B | 1B | 65B | 6B | 60B | 28B | 28B | 28B |
| 28C | 60C | 75C | 1C | 65C | 6C | 60C | 28C | 28C | 28C |
| 28D | 60D | 75D | 1D | 65D | 6D | 60D | 28D | 28D | 28D |
| 28DD | 60E | 75E | 1E | 65E | 6DD | 60E | 28DD | 28DD | 28DD |
| 28E | 60F | 75F | 1F | 65F | 6E | 60F | 28E | 28E | 28E |
| 28F | 60G | 75G | 1G | 65G | 6F | 60G | 28F | 28F | 28F |
| 28G | 60H | 75H | 1H | 65H | 6G | 60H | 28G | 28G | 28G |
| 30A | 65A | 80A | 2A | 70A | 8A | 65A | 30A | 30A | 30A |
| 30B | 65B | 80B | 2B | 70B | 8B | 65B | 30B | 30B | 30B |
Converter FAQs
How accurate is this bra size converter?
It relies on the same calculation engine as our main calculator and incorporates the latest international conversion data. Use it as a starting point and adjust with fit feedback.
Can I switch between centimetres and inches?
Yes. Toggle the unit inside the calculator; results update instantly and the quick links lead to CM or IN focused workflows.
Will it show sister sizes automatically?
Yes. The results include recommended sister sizes plus deep links to our sister size guide for more context.