Find your perfect bra size with our accurate calculator. Enter your underbust (band) measurement and bust measurement to get your size in US, UK, European, and French sizing systems. Say goodbye to ill-fitting bras!
| US/CAN | UK/AU/NZ | EU/EUR | FR/BE/ES | Band (inches) | Band (cm) |
|---|---|---|---|---|---|
| 28 | 28 | 60 | 75 | 28-29 | 71-74 |
| 30 | 30 | 65 | 80 | 30-31 | 76-79 |
| 32 | 32 | 70 | 85 | 32-33 | 81-84 |
| 34 | 34 | 75 | 90 | 34-35 | 86-89 |
| 36 | 36 | 80 | 95 | 36-37 | 91-94 |
| 38 | 38 | 85 | 100 | 38-39 | 96-99 |
| 40 | 40 | 90 | 105 | 40-41 | 102-104 |
| 42 | 42 | 95 | 110 | 42-43 | 107-109 |
| 44 | 44 | 100 | 115 | 44-45 | 112-114 |
| 46 | 46 | 105 | 120 | 46-47 | 117-119 |
| Difference (in) | US/CAN | UK/AU/NZ | EU/EUR | FR/BE/ES |
|---|---|---|---|---|
| 0-0.5 | AA | AA | AA | AA |
| 0.5-1.5 | A | A | A | A |
| 1.5-2.5 | B | B | B | B |
| 2.5-3.5 | C | C | C | C |
| 3.5-4.5 | D | D | D | D |
| 4.5-5.5 | DD/E | DD | E | E |
| 5.5-6.5 | DDD/F | E | F | F |
| 6.5-7.5 | G | F | G | G |
| 7.5-8.5 | H | FF | H | H |
| 8.5-9.5 | I | G | I | I |
| 9.5-10.5 | J | GG | J | J |
❌ Common Fit Issues:
• The band rides up in the back → Band is too large
• Straps dig into shoulders → Band too loose, straps overcompensating
• Breasts spill over the cups → Cups are too small
• Gaps or wrinkles in cups → Cups are too large
• Center gore doesn't lie flat → Cups are too small
• Breasts fall out when leaning → Cups too small or band too loose
✅ How Often Should You Measure?
Your bra size can change due to weight fluctuations, pregnancy, hormonal changes, aging, and exercise. It's recommended to measure every 6-12 months. Approximately 80% of women wear the wrong bra size!
👯 Sister Sizes Explained
Sister sizes are alternate sizes with the same cup volume. If your band is too tight, go up a band size and down a cup letter. If your band is too loose, go down a band size and up a cup letter.
Example: 34C → Sister sizes: 32D (smaller band) or 36B (larger band)
📏 Tips for Accurate Measuring:
• Wear a non-padded, non-push-up bra or no bra at all
• Use a soft, flexible measuring tape (not metal)
• Ensure the tape is level all around your body
• Take measurements in front of a mirror
• Don't pull the tape too tight or leave it too loose
• Measure at least twice to ensure accuracy
🌍 Different Brands, Different Fits:
Bra sizing can vary between manufacturers. Always check each brand's specific size chart. Our calculator provides a great starting point, but trying on bras is still recommended. Use this calculator as a guide before shopping online or in stores.
Use our bra size calculator to find your perfect fit and enjoy comfort, support, and confidence all day long!