American (US) Bra Sizes and Measurements

About US Sizing Convention

American sizes are abbreviated as US. The abbreviation is written together with the size, for example "US 32D" or "32D (US)". US is commonly used internationally.

Use size conversion charts to compare American (US) size with other conventions.

Bra sizes following the US sizing convention are based on measurements in inches. The number represents the bra band size and the letter the cup size.

Bands are measured tightly under bust, cups are measured loosely over the fullest part of the bust. If you are between two band sizes, choose the smaller. If you are between two cup sizes, choose the bigger.

Learn why most women choose too big band size and too small cups.

American band sizes are divided in steps of 2 inches. Band size is a "label" that refers to the measurement above bust. However, the band measurement is usually done under bust, which is why the band size label and the band size measurements are not identical. Always round down to the nearest multiple of 2 inches.

To determine the band size, use the rounded down measurement and add four (+4). For example, measurement 27 inches is rounded down to 26. Adding four gives us 30, which is the band size. The most common band sizes are 32, 34, 36 and 38 which correspond to 70, 75, 80 and 85 in the European and International convention. American band naming and measurements are identical with British (UK).

Cup sizes refer to the difference between over bust and the rounded down under bust measurements. Sizes start with A, which represent an over/under bust difference of 4-5 in. The sizes continue alphabetically in steps of 1 inch with B (5-6 in), C (6-7 in) etc. Due to demand, sizes smaller than A were introduced and are named AA (one size smaller than A) and AAA (two sizes smaller than A). Always calculate the difference to rounded down measurement.

Cup calculation example: Having over bust 39 inches and under bust 33 inches, the 33 needs to be rounded down to 32. The band size is 36 (32+4). The cup size is 39-32 = 7 (note that 32 is the rounded down measurement). A difference of 7 inches gives us a D-cup. 7 inches is between C and D-cup but cups should not squeeze your bust. When between two cup sizes, choose the larger one. The size tables below are based on actual, precise measurements. You will not need to recalculate as in the example above.

Traditionally, US used multiples of "D" in the cup naming convention, for example, "DD" and "DDD" and many brands still do. Today, American brands are transitioning to using E instead of DD, F instead of DDD etc. Both variants are still widely used and this is why American cups are sometimes labeled showing both, for example "E/DD" and "F/DDD".

Contrary to common belief, US and UK cup sizes are not identical. US and UK are both based on the same measurements in inches but the cup labels differ. For example, US K-cup is equivalent to UK H-cup, they have identical measurements but different names.

This page contains tables showing a list of US sizes in both inches (in) and centimeters (cm). Band and cup measurements are shown individually.

US Bra Size Tables

Download Charts and Tables as Images

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• AA to T-cup:
  
• AA-cups:
  
• A-cups:
  
• B-cups:
  
• C-cups:
  
• D-cups:
  
• DD/E-cups:
  
• DDD/F-cups:
  
• DDDD/G-cups:
  
• H-cups:
  
• I-cups:
  
• J-cups:
  
• K-cups:
  
• L-cups:
  
• M-cups:
  
• N-cups:
  
• O-cups:
  
• P-cups:
  
• R-cups:
  
• S-cups:
  
• T-cups:
  

Additional Notes

• Measurements in centimeters are rounded to the nearest integer.
• 1 inch (in) = 2.54 centimeters (cm). 1 cm = 0.394 in.
• American bra sizing convention omits the letter "Q" as cup size.