STEP 1 - Measure for band size:
Keeping the measuring tape parallel with the ground, measure around your bra directly under your bust after expelling all air from your lungs - you want this measurement to be as small as possible.
Round all fractional measurements to the nearest even whole number.
Band Size Chart If Your Measurement is: 33"
Your Band Size is: 34"
After a 38 band size, the band size should be the closest higher even number to your actual measurement. So, 41.5" is a 42 band. A 41" measurement is a 42 band.
STEP 2 - Measure for cup size:
Standing straight, with your arms at your side, measure at the fullest part of your bust (while wearing a non-padded bra) making sure the measuring tape is parallel with the ground and not binding. Round all fractional measurements to the nearest whole number.
STEP 3 - *Calculate your bra size:
Subtract your band measurement (step 1) from your cup measurement (step 2). Generally, for each inch in difference, the cup goes up by one size.
See the cup size conversion chart below.
One inch = A
Two inches =B
Three inches = C
Four inches = D
Five inches =DD/E
Six inches = DDD/F
Seven inches = G
Step 1: 34" under measurement = 36" band size
Step 2: 39" over measurement
Step 3: 39" - 36" = 3" or C Cup Size
Your Size is probably a 36C.
Universal Cup Sizing* Cup sizes larger than a D are called different letters by different brands (a DDD cup size in one brand can be called an E or F in other brands).