Step 1: Measure for Band Size

Keep the measurement tape parallel with the ground, measure your bra directly under your bust after leaving out all air from your lungs. You need this measurement to be as small as possible. What you need to do is round all your fractional measurements to the closest whole number.

Note that after a band size of 38, the band size should be the nearest higher even number to the actual measurement. Therefore 42” band is closest to 41.5” and if it is a 41” measurement, it is a 42” band.

Step 2: Measure for Cup Size

Stand straight, with your arms resting at your side, measure at the fullest part of your bust (whilst you are wearing a non-padded bra), ensure the measurement tape is parallel with the ground and therefore, not binding. Then, as discussed already, approximate all the fractional measurements to the closest whole number.

Step 3: Calculate your Bra size

Subtract your bra band measurement (Step 1) from your cup measurement (step 2). Normally, for each inch in difference, the bra cup size goes up by one size and this is something that has to be noted.


Step 1: 36” under measurement is 36” band

Step 2: 38” over measurement

Step 3: 38” – 36” = 2” or Cup B and there you go, your bra size would be 36B

The cup size calculation doesn’t hold any good at 4” larger than your band size and if you have a saggy, pendulous or a droopy breasts, your measurement will be no longer accurate.

Note: Cup sizes that are larger than a D are known by different letters by various brands. This means a DDD cup can also be termed as an E or F by other brands or manufacturers. The measurement system, at times, can be incorrect if you are trying out with bra cup sizes beyond D. Therefore, kindly check with your brand and go for the correct bra size with the right fitting and measurement.