How to measure
your cup size
Step 1
- Relax your shoulders and stand up straight
- Measure the circumference of your rib cage just below the bust: the tape should feel snug, but not too tight
- Note this measurement down
Step 2
You now need to measure the circumference of the fullest part of the bust:
- Try to keep the tape loose to avoid squeezing the breasts
- Note this measurement down, too
Step 3
You’ll now use the measurements from Step 1 and Step 2 to determine your cup size. To do this, you’ll need to subtract the Step 1 measurement from the Step 2 measurement.
For example, if the measurement from Step 1 is 38 inches and the measurement from Step 2 is 42 inches:
42 − 38 = 4
Now use the table below to convert this number to a letter: this will be your cup size.
Difference
<1
1
2
3
4
5
6
7
Cup Size
AA
A
B
C
D
DD
E
F
How to determine your underband size
To determine your underband size, take the measurement from Step 1 and round up or down to the nearest even number. This is your underband size. Now combine your underband size with your cup size to get your overall bra fit
Signs you’re wearing the wrong size
