Free Bra Size Calculator 2026 to find your perfect band and cup size using accurate measurements with a full bra size guide and fitting tips.
Learn how to measure your bust and under-bust correctly for the most accurate fit.
Measure around ribcage under bust
Measure around fullest part of bust
Enter your measurements and click Calculate to see your bra size
Understanding the relationship between cup size and measurement difference helps you find the perfect fit
| Cup Difference (inches) | Cup Size | Description |
|---|---|---|
| 0 | AA | Extra Small |
| 1 | A | Small |
| 2 | B | Medium |
| 3 | C | Full |
| 4 | D | Large |
| 5 | DD/E | Extra Large |
| 6 | DDD/F | Double Extra Large |
| 7+ | G+ | Triple Extra Large & Above |
* Cup size is determined by the difference between bust and band measurements
Compare band sizes across regions (India / UK, US, EU)
| India / UK | US | EU |
|---|---|---|
| 30 | 30 | 65 |
| 32 | 32 | 70 |
| 34 | 34 | 75 |
| 36 | 36 | 80 |
| 38 | 38 | 85 |
| 40 | 40 | 90 |
| 42 | 42 | 95 |
| 44 | 44 | 100 |
Note: India and UK sizes are the same. EU sizes represent band measurement in centimeters.
Wearing the right bra size isn't just about comfort—it's about health, confidence, and feeling your best every day
Use our calculator above to find your correct bra size in seconds. A well-fitting bra can transform your comfort and confidence!
Our bra size calculator uses the standard method of measuring your under-bust (band) and over-bust (fullest part) to determine your correct bra size. The band size is calculated from your under-bust measurement, while the cup size is determined by the difference between your over-bust and under-bust measurements. We support multiple sizing regions (US, UK, EU, IN) to provide accurate results based on your location.
Finding the right bra size is essential for comfort, support, and confidence. Studies show that up to 80% of women wear the wrong bra size, which can lead to discomfort and health issues. Use our calculator regularly and always try on bras before purchasing to ensure the perfect fit.
Wrap a measuring tape snugly around your ribcage directly under your bust while wearing a non-padded bra or no bra at all. Keep the tape parallel to the ground and breathe normally. Round to the nearest whole number. If the number is odd, add 1 inch to get your band size.
Sister sizes have the same cup volume but different band sizes. For example, 34C, 36B, and 32D are sister sizes. If your current bra band feels too tight, try going up a band size and down a cup size (e.g., from 34C to 36B). If the band is too loose, do the opposite.
Bra sizing isn't standardized globally, and each brand has its own fit model and manufacturing standards. Different styles (balconette, full-cup, sports bra) may also fit differently even within the same brand. Always use your measurements as a starting point and try on bras before purchasing when possible.
Remeasure your bra size every 6-12 months, or whenever you experience significant weight changes (more than 10 pounds), after pregnancy or breastfeeding, or if you notice your current bras no longer fit comfortably. Hormonal changes and aging can also affect breast size.
If you're between sizes, try both and choose based on comfort and fit. Generally, if the band size is between measurements, round up for a looser fit or down for firmer support. For cup size, consider your breast shape—fuller on top may need a larger cup, while fuller on bottom might fit better in a smaller cup with better coverage.
Yes, but keep in mind that breast size changes frequently during pregnancy and breastfeeding. You may need to remeasure every few weeks. Consider getting fitted for nursing bras in your third trimester and again a few weeks after birth once your milk supply is established.