Online Bra Size Calculator
Bra Size Calculator finds your size from band and bust measurements and converts between EU, US, UK, French, Italian, Australian, and Japanese standards.
| Location | Size | Cup |
|---|---|---|
| EU | 80 | A |
| US | 36 | B |
| UK | 36 | B |
| FR/ES/BE | 95 | A |
| IT | 4 | A |
| AU/NZ | 14 | A |
| JP/KO | 80 | B |
What Is This Tool?
The Bra Size Calculator helps you find your bra size and compare it across regions. On the Calculator tab, enter your band and bust measurements in centimeters or inches, and it works out your size in all seven sizing systems: EU/International, US, UK, French (also Spain and Belgium), Italian, Australian (also New Zealand), and Japanese (also South Korea). On the Converter tab, you can start from a size and cup you already know in one region and see the equivalents everywhere else. The result table can be downloaded as a PDF.
How to Use This Tool?
- On the Calculator tab, enter your band and bust measurements.
- Or use the Converter tab to pick a region, size, and cup you already know.
- Switch between centimeters and inches as needed.
- Click Calculate to see your size across all regions.
Key Features
- Calculates your bra size from band and bust measurements.
- Converts a known size and cup between EU, US, UK, French, Italian, Australian, and Japanese standards.
- Shows results for all seven regional sizing systems at once.
- Accepts measurements in centimeters or inches.
- Offers a region/size/cup converter and a PDF download.
Examples
- An 82 cm band and 95 cm bust map to EU 80, US/UK 36, FR 95, IT 4, AU 14, and JP 80.
- A larger bust-to-band difference raises the cup letter.
- On the Converter, choosing EU 80 A shows the matching US, UK, and other sizes.
- Switching to inches reads the imperial measurement fields instead.
Common Use Cases
- Finding your bra size before shopping.
- Converting a size when buying from another country.
- Comparing how your size is labeled across regions.
- Understanding the band-and-cup sizing system.
- Checking an unfamiliar size label against a familiar one.
Tips & Best Practices
- Measure the band snugly around your ribcage, just under the bust.
- Measure the bust at its fullest point, keeping the tape level.
- Measure without thick clothing for accuracy.
- Re-measure occasionally, as size can change over time.
- Treat the result as a starting point — fit varies by brand and style.
Limitations
- Results are estimates; actual fit differs between brands and styles.
- Conversions between systems are approximate, not exact equivalents.
- The tool covers a fixed range of measurements and sizes.
- Nothing is saved between sessions — only the current result can be exported as a PDF.
Frequently Asked Questions
- How is my bra size calculated?
- It matches your band measurement to a band size and your bust-to-band difference to a cup, then maps both across regions.
- Why do cup letters differ by country?
- Each region uses its own labeling, so the same shape can carry a different letter.
- Should I measure in centimeters or inches?
- Either works — switch the units and enter the matching measurements.
- Why doesn't my size match a particular brand's?
- Brands cut differently, so use the result as a guide and try the size on when you can.
Key Terminology
- Band size
- The measurement around the ribcage just under the bust.
- Bust size
- The measurement around the fullest part of the chest.
- Cup size
- The letter reflecting the difference between the bust and band measurements.
- Sister size
- A nearby size with a similar cup volume but a different band.
- Sizing system
- A region's particular way of labeling band and cup sizes.