Professional Bra Size Calculator
Accurate Sizing Guide for Comfort and Health
Professional Bra Size Calculator
Measurements
Your Calculated Size
Enter measurements to calculate your bra size
Fit Guidelines:
- Band should be snug but comfortable
- Cups should contain all breast tissue
- Center gore should lie flat against chest
- Straps should not dig into shoulders
The Importance of Proper Bra Fitting
Professional bra fitting is essential for comfort, health, and confidence. Research indicates that up to 80% of women wear incorrectly sized bras, which can lead to discomfort, poor posture, and health issues. A well-fitted bra provides proper support, enhances appearance, and promotes overall well-being.
The science of bra fitting involves understanding body measurements, proportions, and the mathematical relationships between band size and cup volume. Modern sizing systems use standardized measurements, but variations exist between manufacturers and regions, making accurate measurement and calculation crucial for finding the right fit.
Professional fitting considers not only measurements but also body shape, breast shape, personal comfort preferences, and intended use. This comprehensive approach ensures optimal support, comfort, and confidence for daily wear, sports activities, and special occasions.
Health & Comfort Benefits
🏥 Physical Health Benefits
- Posture Improvement: Proper support reduces back strain
- Pain Reduction: Alleviates back, neck, and shoulder pain
- Circulation: Prevents constriction of blood flow
- Skin Health: Reduces chafing and irritation
- Breast Health: Provides appropriate support during activities
- Sleep Quality: Comfortable sleep bras improve rest
😌 Comfort & Confidence
- All-Day Comfort: Eliminates discomfort from poor fit
- Natural Shape: Enhances natural silhouette
- Clothing Fit: Improves how clothes look and feel
- Self-Confidence: Boosts body confidence and self-esteem
- Activity Freedom: Enables comfortable movement
- Professional Appearance: Creates polished look
📈 Long-term Benefits
- Breast Shape Maintenance: Proper support over time
- Cost Efficiency: Right size means longer-lasting bras
- Health Prevention: Prevents long-term musculoskeletal issues
- Activity Participation: Comfortable exercise and sports
- Wardrobe Versatility: Better foundation for all clothing
- Overall Well-being: Contributes to quality of life
Bra Sizing Mathematics & Formulas
Basic Size Calculation
Band Size Formula:
\[ Band = \text{Under Bust} + 4 \text{ (if even)} \]
\[ Band = \text{Under Bust} + 5 \text{ (if odd)} \]
Note: Modern fitting often uses Under Bust + 0-2 inches
Cup Size Calculation
Cup Size Formula:
\[ \text{Cup Difference} = \text{Bust} - \text{Band} \]
1" difference = A cup
2" difference = B cup
3" difference = C cup
4" difference = D cup, etc.
Sister Size Relationship
\[ \text{Band} \uparrow \text{Cup} \downarrow \text{ or } \text{Band} \downarrow \text{Cup} \uparrow \]
Example: 36C = 34D = 38B (same cup volume)
Cup volume stays constant when band and cup change inversely
Cup Volume Mathematics
Approximate Cup Volume:
\[ V = \frac{4}{3}\pi r^3 \times 0.5 \]
Where r is derived from cup difference and band size
International Sizing Systems
📊 Band Size Conversions
| US/UK | European (EU) | French (FR) | Italian (IT) | Australian |
|---|---|---|---|---|
| 30 | 65 | 80 | 1 | 8 |
| 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 Progressions
US/UK Cups:
A, B, C, D, DD/E, DDD/F, G, H, I, J, K, L...
European Cups:
A, B, C, D, E, F, G, H, I, J, K, L...
Key Differences:
UK: DD, E, F, FF, G vs EU: D, E, F, G, H
Professional Measuring Guide
📐 Step-by-Step Measuring
- Prepare: Wear non-padded, well-fitting bra or go braless
- Posture: Stand straight with arms relaxed at sides
- Under Bust: Measure directly under breast tissue, parallel to floor
- Over Bust: Measure at fullest part of bust, keeping tape level
- Record: Note measurements to nearest quarter inch/centimeter
- Calculate: Use measurements with sizing formula
💡 Measuring Tips
- Use a flexible measuring tape, not a ruler
- Keep tape snug but not tight against skin
- Breathe normally during measurement
- Have someone help for more accurate results
- Measure at consistent time of day
- Take measurements multiple times for accuracy
- Re-measure every 6-12 months or after weight changes
❌ Common Measuring Mistakes
- Measuring over bulky clothing or padded bras
- Pulling tape too tight or leaving it too loose
- Taking measurements at angle instead of parallel to floor
- Measuring after eating large meals or during menstruation
- Using old or stretched measuring tapes
- Not accounting for seasonal weight fluctuations
Calculator vs Professional Fitting
✅ Calculator Benefits
- Free and accessible anytime
- Privacy and comfort of home measurement
- Good starting point for size estimation
- Multiple size system conversions
- Educational about sizing mathematics
- Helpful for online shopping preparation
👩⚕️ Professional Fitting Benefits
- Expert assessment of shape and fit
- Hands-on adjustment and testing
- Brand-specific fitting knowledge
- Immediate try-on and comparison
- Personalized recommendations
- Professional expertise and experience
🎯 Recommended Approach
- Use calculator for initial size estimate
- Try on calculated size and sister sizes
- Consider professional fitting if unsure
- Test fit with different activities
- Re-evaluate periodically
- Combine both approaches for best results
About the Author
Adam
Co-Founder @ RevisionTown
Math Expert specializing in various curricula including IB, AP, GCSE, IGCSE, and more