Get accurate measurements in seconds. Our calculator supports US, UK, EU, and Asian sizing systems — no more guessing, no more discomfort.
Enter your measurements for instant results
Follow these three simple steps to get accurate measurements at home
Wrap a measuring tape snugly around your ribcage, directly under your bust. Keep it level and note the measurement.
Measure around the fullest part of your bust, keeping the tape parallel to the floor. Wear a non-padded bra for accuracy.
Enter both measurements into our calculator and instantly receive your bra size in multiple international sizing systems.
Compare bra sizes across different regions and find your equivalent size worldwide
| US/UK Band | EU Band | FR Band | Pak/India | AU (Dress) |
|---|---|---|---|---|
| 28 | 60 | 75 | 28 | 6 |
| 30 | 65 | 80 | 30 | 8 |
| 32 | 70 | 85 | 32 | 10 |
| 34 | 75 | 90 | 34 | 12 |
| 36 | 80 | 95 | 36 | 14 |
| 38 | 85 | 100 | 38 | 16 |
| 40 | 90 | 105 | 40 | 18 |
| 42 | 95 | 110 | 42 | 20 |
| 44 | 100 | 115 | 44 | 22 |
| 46 | 105 | 120 | 46 | 24 |
Everything you need to know about bra sizing and finding the perfect fit
Measure your band size around your ribcage just under your bust, then measure your bust around the fullest part. Subtract the band from the bust — each inch of difference equals one cup size (1" = A, 2" = B, 3" = C, 4" = D). Use our calculator above for instant, accurate results.
A properly fitting bra has a band that sits level around your body without riding up, cups that fully contain your breasts without gaps or spillage, straps that stay in place without digging in, and a center gore (front piece) that lies flat against your chest.
The letters A, B, C, D represent cup sizes that indicate breast volume. A is the smallest standard cup, with each subsequent letter representing approximately one additional inch of difference between your bust and band measurements.
Sister sizes are bra sizes that share the same cup volume but with different band lengths. For example, 32D, 34C, and 36B are all sister sizes. If your exact size isn't available, trying a sister size can help you find a good fit.
The average bra size in the US and UK is approximately 34DD. However, individual sizes differ significantly based on body shape, genetics, age, and weight. What matters most is finding your personal correct fit.
Yes, your bra size can change due to weight fluctuations, hormonal changes, pregnancy, breastfeeding, menopause, and natural aging. It's recommended to measure yourself periodically to ensure you're wearing the correct size.
DD represents a cup size where the bust measurement is approximately 5 inches larger than the band measurement. In some sizing systems, DD is also called E. Despite common misconceptions, DD is a fairly common size.
In US sizing, DDD and F are often equivalent, representing a 6-inch difference between bust and band. However, UK sizing uses E after DD, and F comes later. Always check which sizing system a brand uses.
Join millions of women who have discovered their true bra size with our free calculator
Calculate Now
The bust measurement is taken around the fullest part of your bust.
For the most accurate results:
The band measurement is taken around your ribcage, just under your bust.
For the most accurate results: