Free Bra Size Calculator
100% Free • Accurate • Private • International Sizing
Free Professional Bra Size Calculator
🆓 Why This Calculator is Free
We believe every woman deserves access to proper bra fitting tools. This calculator uses the same professional methods used by expensive fitting services, but completely free with no hidden costs, registration, or data collection.
📏 Enter Your Measurements
Quick Start Guide:
1. Choose your measurement system
2. Enter under-bust measurement
3. Enter over-bust measurement
4. Get instant free results!
🎉 Your Free Results
Enter your measurements above to get your free, instant bra size calculation
✅ Perfect Fit Checklist:
- Band sits level and snug (not tight)
- Cups contain all breast tissue without spillage
- Center gore lies flat against your chest
- Straps stay in place without digging in
- You can fit 1-2 fingers under the band
Why 80% of Women Need This Free Calculator
📊 Shocking Statistics
- 80% of women wear wrong bra size
- 70% wear cups too small
- 85% wear bands too big
- $50-200 spent on wrong sizes annually
- Professional fittings: $25-75 each
❌ Wrong Size Problems
- Back, neck, and shoulder pain
- Poor posture and breast sagging
- Uncomfortable straps and bands
- Clothes don't fit properly
- Reduced confidence and comfort
✅ Our Free Solution
- Professional accuracy at $0 cost
- Instant results in seconds
- International size conversions
- Complete privacy and security
- Educational fitting guidance
Free Calculator vs Expensive Alternatives
The Science Behind Our Free Calculator
Our free calculator uses the same mathematical principles employed by professional bra fitters worldwide. Here's the science behind accurate sizing:
Modern Band Size Formula
Updated Method (2020s):
\[ \text{Band Size} = \text{Under Bust} + 0 \text{ to } 2 \text{ inches} \]
Traditional "+4 rule" often creates bands that are too large
Cup Size Calculation
Precise Formula:
\[ \text{Cup} = \text{Bust} - \text{Band Size} \]
0-1": AA/A | 1": A | 2": B | 3": C
4": D | 5": DD/E | 6": DDD/F
Sister Size Mathematics
\[ \text{Volume Constant: } (\text{Band}) \times (\text{Cup Index}) \]
Example: 34C = 32D = 36B
Cup volume remains constant when band and cup change inversely
International Conversions
EU Band Formula:
\[ \text{EU Band} = \text{US Band} + 30 \]
Example: US 34 = EU 75
Free Step-by-Step Measuring Guide
📋 What You Need (All Free!)
- 📏 Flexible measuring tape (not metal ruler)
- 🪞 Mirror to check tape position
- 👫 Helper (optional but recommended)
- 📝 Paper & pen to record measurements
- 👙 Non-padded bra or go braless
- ⏰ 5 minutes of your time
🎯 Perfect Measuring Steps
- Prepare: Remove padded bra or go braless
- Stand naturally: Arms at sides, breathe normally
- Under-bust: Wrap tape snugly under breasts
- Keep level: Tape parallel to floor all around
- Over-bust: Measure at fullest part
- Record & calculate: Use our free tool!
💡 Professional Tips
- Best time: Mid-cycle, not during period
- Tape tension: Snug but not tight
- Multiple readings: Measure 2-3 times
- Round properly: To nearest 0.5 inch
- Get help: Friend can ensure accuracy
- Remeasure: Every 6 months or after weight change
Free International Size Conversion Chart
🌍 Band Size Conversions (Free Reference)
| US/UK | Europe | France | Italy | Australia |
|---|---|---|---|---|
| 32 | 70 | 85 | 2 | 10 |
| 34 | 75 | 90 | 3 | 12 |
| 36 | 80 | 95 | 4 | 14 |
| 38 | 85 | 100 | 5 | 16 |
| 40 | 90 | 105 | 6 | 18 |
📏 Cup Size Guide (Free Reference)
🇺🇸 US Progression:
A → B → C → D → DD → DDD → G
🇬🇧 UK Progression:
A → B → C → D → DD → E → F → FF
🇪🇺 EU Progression:
A → B → C → D → E → F → G → H
Life-Changing Benefits of Getting Your Free Size
⚡ Immediate Benefits
- 🚀 Instant comfort - No more adjusting straps
- 💪 Better posture - Proper support alignment
- 👗 Clothes fit better - Improved silhouette
- 😌 Reduced pain - Less back, neck, shoulder strain
- 🏃♀️ Freedom of movement - Exercise comfortably
- ✨ Confidence boost - Feel great all day
🏆 Long-term Benefits
- ❤️ Better health - Reduced chronic pain
- 💰 Save money - Buy right size first time
- 🌟 Enhanced appearance - Natural, lifted look
- 😴 Better sleep - Comfortable sleep bras
- 🏋️♀️ Improved workouts - Proper sports bra fit
- 🛍️ Shopping confidence - Know your size anywhere
💵 Financial Benefits
Annual Savings:
✅ Save $100-300 on returns and exchanges
✅ Extend bra lifespan by 2-3x
✅ Avoid professional fitting fees
- No more buying wrong sizes
- Bras last longer when they fit
- Free tool saves fitting costs
- Better value for money spent
About the Author
Adam
Co-Founder @ RevisionTown
Math Expert specializing in various curricula including IB, AP, GCSE, IGCSE, and more