Bust Size Calculator | Accurate Bra Size Measurement
Calculate your accurate bra size with our bust size calculator. Get international size conversions and fit recommendations instantly.
The Bust Size Calculator is a specialized tool designed to help you accurately determine your bra size based on precise body measurements. This calculator takes into account various measurement systems and provides detailed guidance to ensure the perfect fit for comfort and support.
Understanding Bust Size Measurement
Bust size calculation involves two primary measurements: the band size (underbust measurement) and the cup size (difference between bust and underbust). Accurate measurement is crucial for finding bras that provide proper support, comfort, and aesthetic fit. Different countries use different sizing systems, and this calculator accommodates multiple international standards.
International Sizing Systems
Where:
Band Size = Underbust measurement rounded to nearest even number (US/UK)
Bust Measurement = Fullest part of bust measurement
Cup Size = Difference between bust and band measurements
Key Features
- Multi-System Support: Calculate bra sizes in US, UK, EU, French, Italian, and Australian systems.
- Visual Size Guide: See visual representation of cup size progression and fit.
- Accurate Conversion: Precise conversion between different international sizing standards.
- Measurement Guide: Step-by-step instructions for taking accurate measurements.
- Fit Recommendations: Personalized suggestions based on calculated size and body type.
- Size Comparison: Compare sizes across different brands and countries.
- Mobile Responsive: Works perfectly on all devices including desktops, tablets, and smartphones.
Measurement Accuracy Tips
Proper Measuring Technique
Stand straight with arms at sides. Keep tape parallel to floor. Don't pull too tight or leave too loose.
Clothing Considerations
Measure wearing your best-fitting non-padded bra or no bra at all for most accurate results.
Regular Re-measurement
Body measurements change over time. Re-measure every 6-12 months or after significant weight changes.
Asymmetry Handling
If breasts differ in size, use the measurement from the larger side and consider padding for the smaller.
How Bust Size Calculator Works
Calculation Process
- Underbust Measurement: Enter measurement around ribcage just below breasts
- Bust Measurement: Enter measurement around fullest part of bust
- Measurement Unit: Select inches or centimeters for your measurements
- Country System: Choose your preferred sizing system (US, UK, EU, etc.)
- Calculate: Get instant bra size calculation with detailed breakdown
- Compare: View equivalent sizes in different international systems
International Size Conversion Chart
| US/UK | EU | FR | IT | AU | Bust Difference (in) |
|---|---|---|---|---|---|
| 32A | 70A | 85A | 1A | 10A | 1" |
| 34B | 75B | 90B | 2B | 12B | 2" |
| 36C | 80C | 95C | 3C | 14C | 3" |
| 38D | 85D | 100D | 4D | 16D | 4" |
| 40DD/E | 90E | 105E | 5E | 18E | 5" |
Common Fit Problems & Solutions
Common Issues
- Band rides up in back
- Spilling out of cups
- Gaping cups
- Straps digging into shoulders
- Underwire discomfort
- Center gore not lying flat
Solutions
- Try smaller band size
- Go up one or two cup sizes
- Try smaller cup or different style
- Loosen straps or try wider straps
- Ensure proper underwire fit
- Try different style or larger cup
Bra Styles for Different Shapes
Balanced/Even Shape
Best with: Balconette, Plunge, T-shirt bras. These styles work well with most breast shapes and provide natural lift.
Full on Top
Best with: Full-cup, Balconette, Minimizer bras. These provide coverage and support for fuller upper breast tissue.
Full on Bottom
Best with: Push-up, Plunge, Demi-cup bras. These styles lift from below and enhance natural shape.
Wide Set
Best with: Side-support, Full-cup, Front-closure bras. These help bring breasts closer together.
Close Set
Best with: Plunge, Low-gore, Racerback bras. These accommodate narrowly spaced breasts.
Important Considerations
- Sizing varies between brands - always try before buying
- Different bra styles may require different sizes
- Body changes (weight, pregnancy, aging) affect bra size
- Professional fitting is recommended for best results
- Band should provide 80% of support, straps only 20%
- Replace bras every 6-12 months for optimal support
Frequently Asked Questions
How often should I measure my bust size?
It's recommended to measure every 6-12 months, or after any significant weight change (gain or loss of 10+ pounds), pregnancy, breastfeeding, or major lifestyle changes. Regular measurement ensures you're always wearing the correct size.
Why do bra sizes differ between brands?
Different brands use different sizing charts, manufacturing standards, and fit models. European brands often run smaller, while some US brands may run larger. Always refer to each brand's specific size chart and consider trying multiple sizes.
What's the difference between US and UK sizing?
Band sizes are the same, but cup sizing differs after DD. US sizing typically goes: D, DD, DDD/F, G, H, I. UK sizing goes: D, DD, E, F, FF, G, GG, H, HH, J. EU sizing uses centimeters for band and different cup progression.
How tight should the measuring tape be?
The tape should be snug but not constricting. It should lie flat against your skin without digging in. For band measurement, exhale normally - don't suck in your stomach. For bust measurement, don't compress breast tissue.
What if my measurements are between sizes?
If between band sizes, choose the smaller size if measurements are closer to it, or consider an extender. If between cup sizes, try both sizes in different styles. Your size may vary between brands and styles.
This bust size calculator provides estimates based on standard sizing formulas. Actual fit may vary based on brand, style, fabric, and individual body shape. For the most accurate fitting, visit a professional bra fitter. Measurements should be taken while wearing a well-fitting non-padded bra or no bra at all.