Although for any bra size it is important to have the correct band measurement, for smaller bust sizes, it can really make a big difference due to how bra cups are sized. Basically, as the band size goes up, so does the cup size. For example, a 36AA cup is larger than a 34AA cup and a 34AA cup is larger than a 32AA cup.
How to Determine Your Bra Size
STEP 1: Determining Band Size
- While wearing a lightly lined or unpadded bra, place a tape measure on your back below the shoulder blades at your bra's band level.
- Bring the tape around to the front of your body, lifting it slightly higher as it comes around to the front.
- The tape measure should press loosely against your body, hitting the outer edge of your bra cups near your arm pits and lying across the top of your bra cups.
- The tape should meet in the center of your chest, just above the point where your straps meet the top of the cups.
If the number is even, this is your band size (i.e. 34”).
If the number is odd then add 1" (i.e. if you measured 33,” then round up to 34").
STEP 2: Determining Cup Size
Again, while wearing a lightly lined or unpadded bra, use a tape measure to measure loosely around the fullest part of your bust at nipple level with the tape straight across and around your back, bringing it to the front.
Subtract your band measurement (from Step 1) from this cup measurement. The difference is your cup sizes. For example, if your band size is 34" and your cup size is 35," the difference is 1," which should be an A cup.The chart below provides sizing details.
|Less than 1/2"||AAA|
|Less than 1"||AA|
Bra Size Conversions
Tips for Ensuring the Perfect Fit
The best way to know whether a bra fits well is to try it on!
- All women have one breast that is bigger than the other so choose the cup size of the bigger breast and adjust the strap on the smaller side to accommodate.
- Make sure the straps are adjusted so that in the back, the lower edge of the band should land below the shoulder blades and be level across your body. The back of your bra should not be higher or lower than the front. If it is higher, then you may need to go down a band size or readjust the strap length.
- The center seam (space between the cups) should lie flat against your chest. You will need to go up a cup size if the center seam is not laying flat against your body. The only exception can occur on wireless molded cup bras as these bra styles lack underwires to press the center front area down against your breastbone. As long as you are not spilling out of the top or sides of the cups in the wireless styles, then it is the way the center front should lay.
- Your breasts should not bulge out of your bra, either at the top or sides of the bra.
What Else You Should Know
- It is perfectly normal to change bra sizes throughout your life. We recommend measuring yourself or have someone measure for you.
- Be aware of variations among bra sizes based on the manufacturer's size interpretation and also the style. Normally, 34B cups are used as the average size and AAA, AA and A cups are scaled down from the B cup. This can result in inaccurate AAA, AA and A cup sizes.
- Bra sizing is very individual. A great fitting bra for one 34AA woman may not fit another 34AA woman the same way. We all vary in breast shape, volume and spacing.
- Bra fitting is not an exact science. Use your bra size as a guideline. There may be instances when you may need to go up or down a size, depending on how the bra was designed.