It is not always perfectly accurate for everyone to use the following method, but it should put you on the right track to choosing the size that is right for you. When measuring you should remaining standing and not wear a bra if possible, this just allows for more accurate sizing.

Here is a guide to assist you in finding your UK bra size:

STEP 1: MEASURE YOUR UNDER BUST

Using a soft tape measure you need to take a measurement around your rib cage, snugly, just beneath your breasts, where your bra would sit. Ensure the tape measure lies flat all the way around. Note this measurement down.

STEP 2: MEASURE YOUR OVER BUST

With the tape measure take the measurement of the fullest part of your bust, this is usually over your nipples. Ensure the tape is straight all the way around the body and note this measurement down also.

BRA BAND TABLE

STEP 3: UNDER BAND SIZE

Use the table above to find your under band size by looking at the under bust measurement you noted and checking the corresponding under band size.

STEP 4: CALCULATING CUP SIZE

To calculate your cup size, you should take your over bust measurement and then subtract your under band measurement. In general, for every inch difference, the cup increases by a size. Find the conversion Chart below to help you.

CUP CONVERSION TABLE

EXTRA USEFUL FITTING TIPS:

1. If you are finding there is too much space in the cups then you will want to go down a cup size.
2. If you find your are spilling over the top of the bra, more then you may want to try a bigger cup size.
3.  If the band feels too tight whilst the cups fit, try a back size larger (you will also need to go down a cup size to keep the volume here the same).
4. You want to ensure your wires at the centre front lie flat against the breastbone, whilst the underarm wires sit behind and not on your breast.
5. When trying bras, always lift your breasts lightly into the bra to fill the cups to ensure your breasts are evenly distributed in the cup.
6. Always adjust your straps to enhance the fit of your bra.
7. You want to start wearing your bra on the loosest hook setting, as over time the elastics will stretch slightly, so this ensures you can tighten bra as required to prolong the bra’s lifespan.

The following chart can assist you with finding which sizes to choose should you have any issues. All the sizes in the same row of the chart have the same cup volume. So for instance if you were wearing a 34B and found it tight in the under band you could try a 36A, and the cups would still fit the same.

SISTER SIZE CHART 

SIZING CHART FOR BRIEF ETC: