Bust Size Calculator
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Bust size usually means bra size: a band from your underbust and a cup from the difference between your bust and band. Each inch of difference is one cup: 1 inch is an A, 2 is a B, 3 is a C, 4 is a D. A 36-inch bust over a 32-inch band is a 32D.
| Bust size | |
| Bust (fullest) | 36 in (91.44 cm) |
| Underbust | 32 in (81.28 cm) |
| Bust − underbust | 4 in |
| US bra size | 32D |
| UK size | 32D |
| EU size | 80D |
| Sister sizes | 30DD, 34C |
| Body measurements | |
| Bust : waist : hip | 36 : 28 : 38 in |
| Waist-to-hip ratio | 0.737 |
| Body shape (by measurements) | bottom hourglass |
Show steps
- Measure the bust at its fullest point and the underbust snugly under the bust, keeping the tape level.
- Band size: underbust 32 in, rounded to the nearest even number = 32.
- Cup: bust − band = 36 − 32 = 4 in. Each inch is one cup size: 1 = A, 2 = B, 3 = C, 4 = D, 5 = DD, 6 = DDD.
- Result: US 32D. Sister sizes (same cup volume): 30DD and 34C.
How to measure
- Wear a non-padded bra. Stand straight and breathe normally.
- Underbust: wrap the tape snugly around your rib cage just under the bust, level all the way round.
- Bust: measure around the fullest part without squeezing.
Cup size chart
| Bust − band (in) | US cup | UK cup |
|---|---|---|
| 1 | A | A |
| 2 | B | B |
| 3 | C | C |
| 4 | D | D |
| 5 | DD (E) | DD |
| 6 | DDD (F) | E |
| 7 | G | F |
Sister sizes
Going up one band and down one cup keeps about the same cup volume: 34C, 32D and 36B are sister sizes. Try them if the band feels too tight or loose.
Bust Size Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
Quiz complete
Frequently asked questions
How do I measure my bust size?
Measure snugly under the bust for the band and around the fullest point for the bust, then use the difference for the cup.
What is the difference between bust size and cup size?
Bust size is the full measurement around; cup size depends on the difference between bust and band.
Why do brands fit differently?
There is no single international standard, so start with the calculated size and try sister sizes.
Can I use centimeters?
Yes. Switch units; the calculator converts and also shows EU sizes.
Is there a separate bra size calculator?
Yes, but this page also adds UK and EU sizes, sister sizes and body shape.
Sources
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