Bra Fit Calculator
Step 1: Measure your underband
While wearing a bra, measure around your body, under your bust in inches.
Position the tape measure over the band of your bra and adjust it so it fits firmly around your body.
Use the grid below to convert this measurement to your Australian bra band size.
(Keep this measurement handy as you will also need it in Step 2)
Step 2: Measure your bust to find your cup size
Measure over the fullest part of your bust.
The tape measure should sit snug, but not too firm.
To estimate your cup size, you will need to subtract the underbust measurement from step 1 from the over bust measurement.
Step 2 measurement – Step 1 measurement = Cup Size
The difference between these two measurements will enable you to work out your cup size, using the below grid. You will find each inch of difference will equate to one cup size.
EXAMPLE:
Step 1 measurement: 34″
As from the grid in step 1, we can conclude the band is a size 12.
Step 2 measurement: 39″
Step 2 measurement – Step 1 measurement = Cup Size
39″- 34″ = 5″
Using the cup size grid, we can conclude the cup size to be a DD.
Therefore the Australian Bra Size is 12DD.
Frequently Asked Questions
My boobs are bulging out from the cup and my bust looks lumpy under clothes.
The cup size you are wearing is too small as your boobs should be totally encased in the cup.
How to solve the problem: Try a cup size bigger or a fuller cup bra.
One of my boobs is larger than the other.
Everyone has one boob bigger than the other, you always need to fit to your bigger boob. Remember it will always look better with a little room in one cup as opposed to your boob coming over the top of another!
The wires in my bra stick out at the front or dig in under my arms.
This is often because the cup size is too small and your breasts are forcing the bra away from your body. The wire should lie flat against your body and fully encase your boobs.
How to solve the problem: You should try a cup size larger.
My bra rides up my back and moves around as I move.
The band should fit snuggly and will only move around if it is too big.
How to solve the problem: Try a band size smaller. (Please note that a smaller band means a smaller cup therefore you will need to go up one cup size when you go down a band size).
The cups are wrinkly at the top
The cup size is too big and therefore you boob doesn't fill the cups.
How to solve the problem: Try a smaller cup.
The straps dig into my shoulders.
80 percent of the support should come from the band around your back and not the straps.
How to solve the problem: If your straps are digging in, you may need to go down a band size, up in the cup or you may need to loosen the straps.
My straps keep falling down.
How to solve the problem: Your bra may be too large in the band so try a smaller band size.
Handy Hint
Cup sizes are a ratio of band sizes. To keep the cup sizes the same when you drop a band size, you need to go up in the cup size. For example a 12D is also an equivalent cup size to the following: 10DD, 8E, 6F
The same rule applies if you increase the band size; the 12D is also an equivalent cup size to a 14C.