Find Your Perfect Bra & Breast Size with BestBraSizeCalculator.com
Use our bra and breast size calculator for precise measurements, fit tips, and international conversions for every body.
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.
Brand Size Converter
Size Guide
Enter your current bra size and select the brands you want to convert between. The converter will help you find your equivalent size in different brands.
Tips for Best Results:
- Enter your size exactly as it appears on your current bra
- Make sure to select both the source and target brands
- Different brands may have slightly different sizing standards
- Always try on bras when possible for the best fit
Sister Bra Sizes
If your band feels tight/loose or your size is out of stock, sister sizes help keep similar cup volume while adjusting support.
Bra Size Chart in CM & Inches
Use our comprehensive size chart to find your perfect fit. Compare measurements in both centimeters and inches.
Bra Size Chart in CM & Inches
| Size | In cm | In Inches | ||
|---|---|---|---|---|
| Underbust | Overbust | Underbust | Overbust | |
| 28A | 66 - 76 | 72 - 75 | 26.0 - 30.0 | 28.5 - 29.5 |
| 28B | 66 - 76 | 75 - 77 | 26.0 - 30.0 | 29.5 - 30.5 |
| 28C | 66 - 76 | 77 - 80 | 26.0 - 30.0 | 30.5 - 31.5 |
| 28D | 66 - 76 | 80 - 83 | 26.0 - 30.0 | 31.5 - 32.5 |
| 28DD | 66 - 76 | 83 - 85 | 26.0 - 30.0 | 32.5 - 33.5 |
| 28E | 66 - 76 | 85 - 88 | 26.0 - 30.0 | 33.5 - 34.5 |
| 28F | 66 - 76 | 88 - 90 | 26.0 - 30.0 | 34.5 - 35.5 |
| 28G | 66 - 76 | 90 - 93 | 26.0 - 30.0 | 35.5 - 36.5 |
| 30A | 71 - 81 | 77 - 80 | 28.0 - 32.0 | 30.5 - 31.5 |
| 30B | 71 - 81 | 80 - 83 | 28.0 - 32.0 | 31.5 - 32.5 |
International Bra Size Conversion
Convert your bra size across different international sizing systems. Find your perfect fit worldwide.
Global Size Conversion
| US/UK | UK | EU | FR | IT | JP | AU/NZ | DE |
|---|---|---|---|---|---|---|---|
| 28AA | 28AA | 70AA | 85AA | 3AA | 70AA | 6AA | 70AA |
| 28A | 28A | 70A | 85A | 3A | 70A | 6A | 70A |
| 28B | 28B | 70B | 85B | 3B | 70B | 6B | 70B |
| 28C | 28C | 70C | 85C | 3C | 70C | 6C | 70C |
| 28D | 28D | 70D | 85D | 3D | 70D | 6D | 70D |
| 28DD | 28DD | 70E | 85E | 3E | 70E | 6DD | 70E |
| 28DDD | 28E | 70F | 85F | 3F | 70F | 6E | 70F |
| 28G | 28F | 70G | 85G | 3G | 70G | 6F | 70G |
| 28H | 28FF | 70H | 85H | 3H | 70H | 6FF | 70H |
| 28I | 28G | 70I | 85I | 3I | 70I | 6G | 70I |
Expert Bra Fitting Guides
Breast volume estimator
Convert your band and bust measurements into a volume estimate and learn how support should adapt.
Estimate volumeSports bra support hub
Assess impact levels, fit checkpoints, and care routines for every workout.
Explore the playbookComplete Bra Size Guide
Explore our comprehensive guide to find detailed information about your specific bra size
Expert Bra Measurement Blog
Discover professional tips, guides, and the latest insights about bra fitting and measurement.
How to Measure Your Bust
Learn the professional way to measure your bust size accurately.
Read more →How to Measure Your Waist
Discover the correct way to measure your waist for perfect bra fitting.
Read more →Bra Size Calculator Guide
Learn how to use our calculator effectively for accurate measurements.
Read more →Find Your Size by Country
Get localized sizing information, popular brands, and shopping tips for your country
Each page includes local sizing standards, popular brands, and where to shop
Frequently Asked Questions
How accurate is the bra size calculator?
Our calculator uses professional measurement techniques and algorithms to provide highly accurate results. However, for the best fit, we recommend:
- Taking measurements at least twice to ensure accuracy
- Measuring without a padded bra
- Following the measurement guide carefully
- Considering professional fitting for the most precise results
How often should I measure my bra size?
It's recommended to measure your bra size every 6 months or when you experience significant changes such as:
- Weight gain or loss
- Pregnancy or nursing
- Hormonal changes
- After significant exercise routine changes
What's the difference between US and UK bra sizes?
The main differences between US and UK bra sizes are:
- UK sizes use double letters (DD, FF, GG) while US sizes use single letters
- Band sizes are measured in inches in both systems
- Some cup sizes may have different names in each system
- Our calculator automatically converts between these systems
How do I know if my bra fits correctly?
A well-fitting bra should have these characteristics:
- The band should be snug but comfortable
- Straps should not dig into shoulders
- Cups should fully contain breast tissue
- No spillage or gaping in cups
- Center gore should lie flat against chest
What should I do if my size is between two measurements?
When your measurements fall between sizes, consider these factors:
- Try both sizes to determine the best fit
- Consider the style and brand of the bra
- Check if the bra has adjustable features
- Look for sister sizes that might work better
How do I care for my bras to maintain their fit?
Proper bra care is essential for maintaining fit and longevity:
- Hand wash or use delicate cycle with cold water
- Use mild detergent specifically for delicates
- Air dry flat to maintain shape
- Rotate between multiple bras
- Replace bras every 6-12 months
What Our Users Say
Sarah Johnson
Verified User
Finally found my perfect fit! The calculator was incredibly accurate, and the detailed guides helped me understand my measurements better.
Maria Lee
Verified User
The international size conversion chart is a lifesaver! I can now shop confidently from any country's brands.
Rachel Kim
Verified User
The video tutorials are so helpful! I finally understand how to measure correctly and what to look for in a good fit.
Anna Patel
Verified User
The health tips section is amazing! I've learned so much about proper bra care and when to replace my bras.
Taylor Wong
Verified User
The special types guide helped me find the perfect sports bra for my workouts. The support is incredible!
Emma Smith
Verified User
The brand size converter is so accurate! I can now shop from international brands with confidence.
Why Accurate Measurements Matter
- ✓Proper support and comfort throughout the day
- ✓Better posture and reduced back pain
- ✓Enhanced confidence and appearance
- ✓Longer-lasting bras with proper care
Expert Fitting Tips
- •Measure yourself every 6-12 months
- •Wear a non-padded bra when measuring
- •Stand straight with arms at your sides
- •Take measurements in the morning