Bra Size Chart
Every bra size from 28AA to 48H with its underbust and bust measurements, in inches and centimeters — plus the band chart, the cup chart, and US, UK, EU, FR, AU and JP equivalents.
Last reviewed on 8 November 2026.
Every bra size is built from two measurements. The band is the snug measurement around your ribcage, just under the bust. The cup is the difference between your full bust and that band measurement. The two charts below convert each measurement into a size; if you have not measured yet, start with how to measure your bra size or use the quick checker below.
Skip the chart: check your size
Enter your underbust and full bust and the checker reads the chart for you, with sister sizes and a link to the guide for your size.
Band size chart (underbust → band)
Find your underbust measurement, then read across for the band number in each system. Bands are even numbers; round to the nearest one.
| Underbust (in) | Underbust (cm) | US / UK | EU / JP | FR | AU |
|---|---|---|---|---|---|
| 27–28 | 68–73 | 28 | 60 | 75 | 6 |
| 29–30 | 74–78 | 30 | 65 | 80 | 8 |
| 31–32 | 79–83 | 32 | 70 | 85 | 10 |
| 33–34 | 84–88 | 34 | 75 | 90 | 12 |
| 35–36 | 89–93 | 36 | 80 | 95 | 14 |
| 37–38 | 94–98 | 38 | 85 | 100 | 16 |
| 39–40 | 99–103 | 40 | 90 | 105 | 18 |
| 41–42 | 104–108 | 42 | 95 | 110 | 20 |
| 43–44 | 109–113 | 44 | 100 | 115 | 22 |
| 45–46 | 114–118 | 46 | 105 | 120 | 24 |
| 47–48 | 119–123 | 48 | 110 | 125 | 26 |
Cup size chart (bust − underbust → cup)
Subtract your underbust from your full bust and find the difference below. Cup letters match across systems up to D, then diverge.
| Difference | US | UK / AU | EU / FR / JP |
|---|---|---|---|
| 0 in (0 cm) | AA | AA | AA |
| 1 in (2.5 cm) | A | A | A |
| 2 in (5 cm) | B | B | B |
| 3 in (7.5 cm) | C | C | C |
| 4 in (10 cm) | D | D | D |
| 5 in (12.5 cm) | DD | DD | E |
| 6 in (15 cm) | DDD / F | E | F |
| 7 in (18 cm) | G | F | G |
| 8 in (20 cm) | H | FF | H |
Note: cup letters above D vary by brand, especially in US sizing where DDD, DDDD, and F/G are used inconsistently. The conversion chart shows how each system maps step by step.
Full bra size chart: every size with its measurements
The two charts above are the rule; this one is the rule applied to every size. Each cell is a size, with the full-bust measurement it is built for underneath. Read down the left-hand column for your underbust (band), then across to the column whose difference matches yours. Every size links to its own guide with sister sizes, conversions and fit notes.
| Bandunderbust | AA<1 in | A1 in | B2 in | C3 in | D4 in | DD5 in | DDD/F6 in | G7 in | H8 in |
|---|---|---|---|---|---|---|---|---|---|
| 2827–29 in | 28AA28 in | 28A29 in | 28B30 in | 28C31 in | 28D32 in | 28DD33 in | 28DDD34 in | 28G35 in | 28H36 in |
| 3029–31 in | 30AA30 in | 30A31 in | 30B32 in | 30C33 in | 30D34 in | 30DD35 in | 30DDD36 in | 30G37 in | 30H38 in |
| 3231–33 in | 32AA32 in | 32A33 in | 32B34 in | 32C35 in | 32D36 in | 32DD37 in | 32DDD38 in | 32G39 in | 32H40 in |
| 3433–35 in | 34AA34 in | 34A35 in | 34B36 in | 34C37 in | 34D38 in | 34DD39 in | 34DDD40 in | 34G41 in | 34H42 in |
| 3635–37 in | 36AA36 in | 36A37 in | 36B38 in | 36C39 in | 36D40 in | 36DD41 in | 36DDD42 in | 36G43 in | 36H44 in |
| 3837–39 in | 38AA38 in | 38A39 in | 38B40 in | 38C41 in | 38D42 in | 38DD43 in | 38DDD44 in | 38G45 in | 38H46 in |
| 4039–41 in | 40AA40 in | 40A41 in | 40B42 in | 40C43 in | 40D44 in | 40DD45 in | 40DDD46 in | 40G47 in | 40H48 in |
| 4241–43 in | 42AA42 in | 42A43 in | 42B44 in | 42C45 in | 42D46 in | 42DD47 in | 42DDD48 in | 42G49 in | 42H50 in |
| 4443–45 in | 44AA44 in | 44A45 in | 44B46 in | 44C47 in | 44D48 in | 44DD49 in | 44DDD50 in | 44G51 in | 44H52 in |
| 4645–47 in | 46AA46 in | 46A47 in | 46B48 in | 46C49 in | 46D50 in | 46DD51 in | 46DDD52 in | 46G53 in | 46H54 in |
| 4847–49 in | 48AA48 in | 48A49 in | 48B50 in | 48C51 in | 48D52 in | 48DD53 in | 48DDD54 in | 48G55 in | 48H56 in |
| Bandunderbust | AA<2.5 cm | A3 cm | B5 cm | C8 cm | D10 cm | DD13 cm | DDD/F15 cm | G18 cm | H20 cm |
|---|---|---|---|---|---|---|---|---|---|
| 2869–74 cm | 28AA71 cm | 28A74 cm | 28B76 cm | 28C79 cm | 28D81 cm | 28DD84 cm | 28DDD86 cm | 28G89 cm | 28H91 cm |
| 3074–79 cm | 30AA76 cm | 30A79 cm | 30B81 cm | 30C84 cm | 30D86 cm | 30DD89 cm | 30DDD91 cm | 30G94 cm | 30H97 cm |
| 3279–84 cm | 32AA81 cm | 32A84 cm | 32B86 cm | 32C89 cm | 32D91 cm | 32DD94 cm | 32DDD97 cm | 32G99 cm | 32H102 cm |
| 3484–89 cm | 34AA86 cm | 34A89 cm | 34B91 cm | 34C94 cm | 34D97 cm | 34DD99 cm | 34DDD102 cm | 34G104 cm | 34H107 cm |
| 3689–94 cm | 36AA91 cm | 36A94 cm | 36B97 cm | 36C99 cm | 36D102 cm | 36DD104 cm | 36DDD107 cm | 36G109 cm | 36H112 cm |
| 3894–99 cm | 38AA97 cm | 38A99 cm | 38B102 cm | 38C104 cm | 38D107 cm | 38DD109 cm | 38DDD112 cm | 38G114 cm | 38H117 cm |
| 4099–104 cm | 40AA102 cm | 40A104 cm | 40B107 cm | 40C109 cm | 40D112 cm | 40DD114 cm | 40DDD117 cm | 40G119 cm | 40H122 cm |
| 42104–109 cm | 42AA107 cm | 42A109 cm | 42B112 cm | 42C114 cm | 42D117 cm | 42DD119 cm | 42DDD122 cm | 42G124 cm | 42H127 cm |
| 44109–114 cm | 44AA112 cm | 44A114 cm | 44B117 cm | 44C119 cm | 44D122 cm | 44DD124 cm | 44DDD127 cm | 44G130 cm | 44H132 cm |
| 46114–119 cm | 46AA117 cm | 46A119 cm | 46B122 cm | 46C124 cm | 46D127 cm | 46DD130 cm | 46DDD132 cm | 46G135 cm | 46H137 cm |
| 48119–124 cm | 48AA122 cm | 48A124 cm | 48B127 cm | 48C130 cm | 48D132 cm | 48DD135 cm | 48DDD137 cm | 48G140 cm | 48H142 cm |
Band rows show the underbust range each band fits; cup columns show the bust-minus-underbust difference. US DDD and F are the same cup, so the DDD/F column covers both. Cells in the same diagonal (for example 32D, 34C, 36B) are sister sizes.
Most-searched sizes
Each size on BraCalc has its own page with measurements, sister sizes, international conversions, and fit notes. These are the ones people look up most, or open the full bra size index.
32B · 32C · 32D · 34B · 34C · 34D · 34DD · 34F · 36B · 36C · 36D · 36DD · 36DDD · 38C · 38D · 38DD · 40D · 40DD
Frequently asked questions
How do I read a bra size chart?
Use two measurements. Find your underbust in the band table to get your band number. Then subtract your underbust from your full bust and find that difference in the cup table to get your cup letter. Together they make your size, such as 34C.
What is the average bra size?
Average measured size has drifted upward over time and varies by country, but in the US and UK it is commonly cited around a 34DD/34E. Averages are not targets — the right size is whatever your own measurements give.
Is a bra size chart the same in every country?
No. Band numbers differ (the US and UK use inches, the EU and Japan use centimeters, France adds 15 to the EU number, Australia uses a small even scale) and cup letters diverge above D. The conversion chart lines them up side by side.
What bra size is a 34-inch underbust and 38-inch bust?
A 34-inch underbust gives a 34 band. The bust is 4 inches larger, and 4 inches is a D cup, so the size is 34D (UK 34D, EU 75D). In centimeters that is roughly an 86 cm underbust and a 97 cm bust. The same method works for any pair of numbers, or the checker above does it for you.
How do I use the bra size chart in cm?
Switch the full chart to centimeters with the toggle above it. Measure your underbust and bust in cm, find the band row that contains your underbust, then move across to the column whose difference matches yours (about 2.5 cm per cup letter). EU, FR and JP sizes read the band directly in centimeters, so a US 34 is an EU 75 and a FR 90.
Is a bigger cup letter always a bigger cup?
Only on the same band. The letter measures the difference between bust and underbust, so a 32D and a 38D are very different cups. Reading the chart diagonally shows this: a 32D holds about the same volume as a 34C or a 36B. If you change band, change cup the other way to keep the same fit.