Bra Size Converter Guide
Our Bra Size Converter is a comprehensive tool designed to help you find your perfect bra size across different international sizing systems. Whether you’re shopping online from international retailers or trying to understand your size in a different country’s system, our converter makes it easy to get accurate conversions.
Features
- Measurement Calculator: Input your underbust and bust measurements to calculate your bra size
- International Conversions: Convert between US, UK, EU, French, Italian, Australian, and Japanese sizes
- Sister Sizes: Find alternative sizes that may fit better or be more readily available
- Multi-System Comparison: View your size across all major sizing systems at once
- Fitting Guide: Learn how to measure yourself and ensure proper fit
- Mobile-Friendly: Use on any device with our responsive design
How to Use
Method 1: Calculate from Measurements
- Enter your underbust measurement (in inches)
- Enter your bust measurement (in inches)
- Click “Calculate Size”
- View your calculated size and all available conversions
Method 2: Convert Existing Size
- Select your current size system (e.g., US, UK, EU)
- Enter your current size (e.g., 32B)
- Select the target size system
- Click “Convert”
- View the converted size and sister sizes
Understanding Bra Sizes
Key Components
| Component | Description |
|---|---|
| Band Size | The number in your bra size (e.g., 32 in 32B) |
| Cup Size | The letter in your bra size (e.g., B in 32B) |
| Sister Size | Alternative size with same cup volume but different band size |
International Size Systems
| System | Band Size | Cup Size | Notes |
|---|---|---|---|
| US | Inches | A, B, C, D, DD, DDD, G, H, I, J, K, L, M, N | Standard US sizing |
| UK | Inches | A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ | Similar to US but with different cup progression |
| EU | Centimeters | A, B, C, D, E, F, G, H, I, J, K, L, M, N | Band size = underbust in cm + 15 |
| France | Centimeters | A, B, C, D, E, F, G, H, I, J, K, L, M, N | Similar to EU sizing |
| Italy | Inches | A, B, C, D, E, F, G, H, I, J, K, L, M, N | Similar to EU sizing |
| Australia | Inches | A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ | Similar to UK sizing |
| Japan | Centimeters | A, B, C, D, E, F, G, H, I, J, K, L, M, N | Similar to EU sizing |
How to Measure Yourself
Step-by-Step Guide
Underbust Measurement
- Measure around your ribcage, just under your bust
- Keep the tape measure snug but not tight
- Round to the nearest even number
Bust Measurement
- Measure around the fullest part of your bust
- Keep the tape measure parallel to the floor
- Don’t pull the tape too tight
Calculate Cup Size
- Subtract your underbust measurement from your bust measurement
- Use the difference to determine your cup size:
- 1" = A cup
- 2" = B cup
- 3" = C cup
- 4" = D cup
- 5" = DD cup
- And so on…
Sister Sizes
Sister sizes are alternative bra sizes that have the same cup volume but different band sizes. For example:
- 32C = 30D = 34B
- 36D = 34DD = 38C
This is useful when:
- Your usual size is not available
- You need a different band fit
- You’re between sizes
Proper Fit Checklist
A well-fitting bra should have:
- Band that sits level around your body
- Cups that fully contain breast tissue
- Center gore that lies flat against your chest
- Straps that don’t dig into your shoulders
- No spillage or gaping in the cups
Common Size Conversions
| US Size | UK Size | EU Size | French Size | Italian Size | Australian Size | Japanese Size |
|---|---|---|---|---|---|---|
| 32A | 32A | 70A | 85A | 1A | 10A | 70A |
| 32B | 32B | 70B | 85B | 1B | 10B | 70B |
| 32C | 32C | 70C | 85C | 1C | 10C | 70C |
| 34A | 34A | 75A | 90A | 2A | 12A | 75A |
| 34B | 34B | 75B | 90B | 2B | 12B | 75B |
| 34C | 34C | 75C | 90C | 2C | 12C | 75C |
Tips for Accurate Size Conversion
Know Your Measurements
- Take fresh measurements before converting
- Use a soft measuring tape
- Measure without a bra on
Consider Brand Variations
- Different brands may fit differently
- Check brand-specific size charts
- Read customer reviews for fit information
Understand System Differences
- EU sizes use centimeters
- UK and US have different cup progressions
- Some systems use different band size calculations
Use Cases
Online Shopping
- Convert sizes when shopping from international retailers
- Find your size in different country’s systems
- Compare sizes across brands
Travel Planning
- Know your size in destination country
- Plan shopping trips
- Pack appropriate undergarments
Size Verification
- Double-check your size
- Verify measurements
- Find alternative sizes
Frequently Asked Questions
How accurate is the converter?
Our converter uses standardized conversion formulas and is regularly updated to ensure accuracy. However, we recommend checking brand-specific size charts for the most precise fit.
What are sister sizes?
Sister sizes are alternative bra sizes that have the same cup volume but different band sizes. They’re useful when your usual size isn’t available or when you need a different band fit.
How do I measure myself correctly?
Follow our step-by-step measurement guide in the “How to Measure Yourself” section. Make sure to measure without a bra on and keep the tape measure parallel to the floor.
Why do different countries use different sizing systems?
Different countries developed their own sizing systems based on their measurement standards and historical practices. Our converter helps bridge these differences.
Can I use the converter for all bra types?
Yes, the converter works for most bra types, but some specialized bras (like sports bras or maternity bras) may have different sizing requirements.
Related Tools
Disclaimer
While our Bra Size Converter provides accurate conversions based on standard sizing systems, we recommend:
- Always checking brand-specific size charts
- Trying on bras when possible
- Consulting with a professional fitter for the most accurate fit
- Considering that different styles may fit differently
Remember that the best way to ensure a perfect fit is to try on bras in person and consult with a professional fitter when possible. Our converter is a helpful tool but should be used as a guide rather than a definitive answer.