A LITTLE GUIDANCE. LESS GUESSWORK.
Bra Size Chart
Start with your measurements. Read the band and cup together.
This chart follows our two-measurement calculator. It gives a starting size to try, rather than a universal brand fitting chart.
1. Find your starting band size
Measure snugly just below your breasts with the tape level. Our quick method rounds to the nearest even inch; an odd-inch midpoint rounds up. It does not add four inches.
Measurements shown in inches. “Less than” excludes the upper endpoint.
| Measured underbust | Starting band |
|---|---|
| 26 to less than 27 in | 26 |
| 27 to less than 29 in | 28 |
| 29 to less than 31 in | 30 |
| 31 to less than 33 in | 32 |
| 33 to less than 35 in | 34 |
| 35 to less than 37 in | 36 |
| 37 to less than 39 in | 38 |
| 39 to less than 41 in | 40 |
| 41 to less than 43 in | 42 |
| 43 to less than 45 in | 44 |
| 45 to less than 47 in | 46 |
| 47 to less than 49 in | 48 |
| 49 to 50 in | 50 |
A US/UK band label is not a direct centimeter measurement. EU, French and Australian band labels belong to different numbering systems: compare band labels.
2. Use your bust measurement to find the cup
Convert your bust measurement to inches, then round it to a whole inch (half an inch rounds up). Subtract the starting band from step 1. Match that difference below. Use inches for this step even if you measured in centimeters.
| Difference | US cup | UK cup |
|---|---|---|
| 0 in | AA | AA |
| 1 in | A | A |
| 2 in | B | B |
| 3 in | C | C |
| 4 in | D | D |
| 5 in | DD | DD |
| 6 in | DDD | E |
| 7 in | G | F |
| 8 in | H | FF |
| 9 in | I | G |
| 10 in | J | GG |
| 11 in | K | H |
| 12 in | L | HH |
These are the letter sequences used by our calculator. US brands may use different labels after D; check the brand’s own table. A D cup is not a fixed volume—it changes with band size.
How to read the chart: 32D
- An underbust of 32 inches (81.28 cm) gives a starting band of 32.
- A bust of 36 inches (91.44 cm) rounds to 36.
- 36 − 32 = 4. The chart gives D, so the starting size is 32D in both US and UK labels.
At an underbust of exactly 33 inches, the starting band changes to 34. At a bust of 36.5 inches, the rounded bust becomes 37. Close to these boundaries, recheck the tape placement before treating a different label as a meaningful change in fit.
Should I use a size chart, calculator or converter?
- Have body measurements? Use the band and cup tables above to work through our quick method, or enter your underbust and bust in the bra size calculator. Bust alone is not enough for this method.
- Already know your bra size? Use the size converter with your full band, cup and sizing system to compare labels across countries.
- Need a UK starting size? Read the UK cup column above, or choose UK in the calculator. If you still need your measurements, follow our measuring guide first. See the UK bra size chart for inches/cm band ranges and a worked UK example.
When a chart is not enough
Two circumferences cannot describe every breast shape or predict the fit of every bra. If measurements vary by posture or you want more context, try the optional six-measurement mode. It uses a separate method; do not combine its readings with this quick chart.
Our quick input range is underbust 26–50 inches, bust up to 64 inches, and cup differences 0–12. Bust cannot be smaller than underbust. Values outside this range need another reference, not a forced result.
Bra size chart questions
Is 34D bigger than 32D?
The same cup letter on a larger band generally represents more cup capacity. Compare complete sizes, not letters alone. A nearby sister size of 32D is 34C, but different dimensions can still affect fit.
Should I use inches or centimeters?
Either is fine when measuring. The calculator converts centimeters precisely; this quick method’s rounding and cup difference operate in inches. Do not round your centimeter readings first.
Why does a brand chart give a different result?
Brands may use different measurement methods, labels and construction. This is our calculator’s starting-size chart. Use the retailer’s information and a fit check when choosing a particular bra.
Need help taking the readings? Follow our illustrated measuring guide. The method is based on the approach described in BRABAR’s fit guide, with our product limits documented separately.
Method and references reviewed September 29, 2026. Read our methods and limits.