Find your perfect fit with our easy bra size calculator. Just measure, calculate, and get your size in minutes.
Measure snugly around your ribcage, right under your breasts. Keep the tape parallel to the floor.
Measure around the fullest part of your bust, keeping the tape parallel to the floor.
Convert between different country sizing systems easily
| US/CA | UK | EU | FR/BE/ES | Band (inches) | Band (cm) |
|---|---|---|---|---|---|
| 32A | 32A | 70A | 85A | 32 | 70-75 |
| 34B | 34B | 75B | 90B | 34 | 75-80 |
| 34C | 34C | 75C | 90C | 34 | 75-80 |
| 36D | 36D | 80D | 95D | 36 | 80-85 |
| 38DD | 38DD | 85E | 100E | 38 | 85-90 |
| 40DDD | 40E | 90F | 105F | 40 | 90-95 |
| 42G | 42F | 95G | 110G | 42 | 95-100 |
Note: Different brands may have slightly different sizing. Always check their specific size chart when shopping.
Follow these simple steps for accurate measurements. All you need is a soft measuring tape!
Wrap the tape measure around your ribcage, right under your breasts. Make sure it's snug but comfortable. This gives you your band size. If you get an odd number, round up to the nearest even number.
Measure around the fullest part of your bust. Keep the tape parallel to the floor. Stand naturally with arms at your sides. This measurement is crucial for an accurate cup size calculation.
Subtract your band measurement from your bust measurement. Every inch difference equals one cup size. Example: 4" difference = D cup. Our calculator does this math for you automatically.
US, UK, EU, and French sizes all use slightly different measurements. A 34C in US is 75C in EU and 90C in French sizing. Our calculator shows all these so you can shop anywhere in the world.
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Answers to questions people usually ask about finding the right bra size
Different countries developed their own sizing systems over time. US and UK use inches for band measurement, while EU uses centimeters. French sizing adds 15cm to the band measurement. That's why a 34C in US becomes 75C in EU and 90C in French. Our bra size calculator handles all these conversions for you.
For band sizes: US 32 = EU 70, US 34 = EU 75, US 36 = EU 80, etc. For cup sizes: A, B, C, D are usually the same, but after D it varies. UK uses DD while EU uses E. Our calculator shows all these conversions automatically so you don't have to worry about the math.
Up to D cup, they're usually the same. After D: US uses DD, DDD, G while UK uses DD, E, F, FF, G. EU goes straight from D to E to F. The cup volume is similar but the letters are different. That's why it's helpful to use our size calculator which shows all systems at once.
The band should be snug on the loosest hook when you buy it. It shouldn't ride up in back or feel like it's digging in. You should be able to fit two fingers under the band comfortably. Remember, about 80% of your bra's support comes from the band, not the straps.
Most people wear a band that's too big and cups that are too small. They think the straps should hold everything up, but really the band should do most of the work. If your straps are digging in or you have spillage over the cups, you probably need a different cup size calculation.