Step 1. Measuring your Back Size
Stand in front of a mirror. Remove your bra and using a measure (in inches) firmly around the rib cage immediately under the bust. Ensure that the tape measure is straight across the back and is level with underbust. With the tape measure taught, you should just be able to get one finger under it. With this measurement consult Table 1 to confirm your BACK SIZE.
Table 1

Back measurement = Back Size

26.5"-28.5" = 32"

28.5"-30.5" = 34"

30.5"- 32.5" = 36"

32.5"-34.5" = 38"
Step 2. Measure your Cup Size
Measure around the fullest part of the bust, again in inches, ensuring that the tape measure is straight across the back and is level with the fullest part of the bust. Taking your back size from Table 1, consult Table 2 to confirm your CUP SIZE.

Step 3. Bra Size
The results from Table 1 and Table 2 will confirm your BRA SIZE

Example
Measurement underbust=32"
Therefore BACK SIZE=36"
Fullest part of bust measurement=37"
Therefore CUP SIZE=B CUP
BRA SIZE = 36B

Table 2

Measuring guide

Cup Size
The same cup measurement as the back size A cup
1" more in cup measurement than back size B cup
2" more in cup measurement than back size C cup
3" more in cup measurement than back size D cup
4" more in cup measurement than back size DD cup
5" more in cup measurement than back size E cup
6" more in cup measurement than back size F cup

 The above information is intended as a guide only.