Bra Size Calculator
How to Measure
Enter Your Measurements
Your Bra Size
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International Size Conversions
| US/UK | EU | FR | AU |
|---|---|---|---|
| Calculate your size to see conversions | |||
The band should fit snugly around your ribcage with minimal spillage. If your breasts overflow the cups, go up a cup size. If there are empty spaces, go down a cup size.
Complete Bra Fitting Guide
The right bra size is essential for comfort, support, and confidence. However, most people wear the wrong bra size. This calculator helps you find your true size using the official LEBI (Lingerie Experts Bureau International) sizing method.
Why Accurate Bra Sizing Matters
A properly fitting bra provides:
- Better Support: Proper support reduces strain on shoulders and back
- Improved Comfort: No spillage, gaps, or digging straps
- Better Appearance: Clothes fit better and look more flattering
- Health Benefits: Reduces shoulder and back pain from poor support
- Confidence: Proper fit makes you feel more confident
Understanding Band Sizes
Band sizes range from 28 to 48 inches in US/UK sizing. Your band size is determined by measuring directly under your bust where the band sits. Each inch increase represents one band size (32, 34, 36, etc.). If your measurement is between sizes, round to the nearest full inch.
Understanding Cup Sizes
Cup sizes start at AA (smallest) and go up through A, B, C, D, DD, DDD, and beyond. Each cup size represents approximately one inch of difference between your bust and band measurements. For example, a 1-inch difference = A cup, 2 inches = B cup, 3 inches = C cup, and so on.
Size Conversion Guide
| Region | Sizing System | Notes |
|---|---|---|
| United States | US Standard (32, 34, 36...) | Most common in North America |
| United Kingdom | UK Standard (Same as US) | Identical to US sizing |
| Europe | EU/International (65, 70, 75...) | Based on centimeters, 5cm increments |
| France | French (80, 85, 90...) | Similar to EU but slightly different scale |
| Australia | AU/NZ (Same as UK/US) | Uses UK/US sizing system |
Common Fitting Issues & Solutions
- Spillage on top: Cup size is too small - go up one or two cup sizes
- Gaps in the cups: Cup size is too large - go down one cup size
- Straps falling off: Band is too large - go down one band size
- Band rides up in back: Band is too large - go down one band size
- Band digs in: Band is too small - go up one band size
- Underwire poking: Cup size may be wrong - try sister size
What is a Sister Size?
Sister sizes are bra sizes that have the same cup volume but different band sizes. For example, 34B and 32C are sister sizes - they have the same cup volume but different band measurements. If your size is uncomfortable, try a sister size: go down one band size and up one cup size (or vice versa).
How to Measure for the Most Accurate Size
- Wear an unpadded bra or no bra for accurate measurements
- Use a soft measuring tape, not a rigid ruler
- Keep the tape snug but not tight - it shouldn't dig in
- Stand in front of a mirror to ensure the tape is level
- Measure in inches for best accuracy (if not given in your region)
- Remeasure if you notice any significant weight change
Shopping Tips for the Right Bra
- Always try on bras before buying - sizing varies by brand and style
- The band should not ride up in the back
- Straps should sit at the edge of your shoulders, not falling off
- Cups should have minimal spillage and no gaps
- The center gore (front) should sit flat against your breastbone
- Invest in at least 3-4 well-fitting bras for rotation and longevity
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Frequently Asked Questions
1. How often should I get re-measured?
At least once a year, or whenever you experience significant weight changes, pregnancy, hormonal changes, or aging. Most experts recommend annual re-measuring for optimal fit.
2. What's the difference between US and UK sizing?
US and UK use the same band sizing (32, 34, 36, etc.) and cup letters (A, B, C, D, etc.), so they are identical. There is no difference between US and UK bra sizes.
3. What if my measurements don't round to a standard size?
Round to the nearest full inch for band size. If your bust measurement lands between cup sizes, go with the larger cup size for comfort and prevent spillage.
4. Can my bra size change?
Yes, absolutely. Bra sizes can change due to weight fluctuations, hormonal changes, aging, pregnancy, surgery, and exercise. This is completely normal.
5. What's the most common bra size?
The most commonly worn size is 34B in the US, though the actual average has been shifting. However, the most commonly *needed* size varies by population.
6. How do I know if my bra fits correctly?
A proper fit means: the band sits level around your ribcage, straps don't fall off, cups have no spillage or gaps, the center gore sits flat on your breastbone, and you can fit one finger under the band.
7. What if I'm between two band sizes?
If you're exactly between two sizes (e.g., 33"), choose the larger band size (34") for comfort. A snug band is better than one that rides up in the back.
8. Should I size up or down when pregnant?
During pregnancy, you may need to go up 1-2 band sizes and 1-2 cup sizes. Comfort is key - wear soft, supportive bras without underwire if possible.
9. Why do different brands fit differently?
Different brands have different cutting patterns, cup shapes, band tensions, and materials. What works in one brand may not work in another, so always try on before buying.
10. How should I care for my bras?
Hand wash in cool water with gentle soap, lay flat to dry, avoid high heat, don't put bras in the dryer, and rotate bras to extend their lifespan to 6-12 months of regular use.
11. What is a balconette bra vs full cup?
A balconette (also called balcony) shows more cleavage and covers about 3/4 of the breast. A full-cup bra covers the entire breast. Choose based on preference and outfit.
12. Is this calculator accurate for all body types?
This calculator uses the standard sizing method and provides a good starting point. However, different body shapes may need adjustments. Always try on bras and adjust sizes as needed for comfort.