How To Determine Your Bra Size


At Mio Destino we want you to always feel comfortable in your lingerie. For that you need to be wearing the right size. In this section we will guide you on how to determine your bra size in a few simple steps.

How To Determine Your Bra Size

It is estimated that over 90% of woman are wearing the wrong bra size. The bra sizing system can be very confusing as there are so many styles and sizes out there!

Finding the right bra size and shape can make such a difference to your silhouette and to your confidence as well. At Mio Destino we aim to demystify bra sizes and bra fitting.

Follow our guide below and we are sure you'll be able to find your true bra size.

Bra Measuring Guide

There is a certain amount of skill required when being measured for a bra. You might need to enlist the help of your partner or friend, as you won't be able to measure yourself accurately on your own.

Get your tape measure out and let's determine your bra size! 

You might also want to have a pen and a calculator handy.

Step 1 - Take a firm measurement around your rib cage, directly underneath the bust.  Make sure the person helping you double checks that the tape measure does not slip down at the back. This will give you your underbust measurement.

Step 2 - Use the following guide to determine your back size:

Underbust measurement

Bra Underband Size
25” - 26" 30
27” - 28" 32
29” - 30" 34
31” - 32" 36
33” - 34" 38
35” - 36" 40
37” - 38" 42
39” - 40" 44
41” - 42" 46

For example – if you measure 28” on the underbust measurement, your bra underband size is 32.

Step 3  - To determine your cup size, take a second measurement over the fullest part of the bust. This should be an actual measurement so do not make it too tight.

Again, try to ensure the tape measure does not slip down your back.

Step 4 - To determine your cup size you need to do a simple calculation. You need to take the second measurement away from the first measurement. The number you are then left with determines your cup size.

For example – our model measures 35” on the fullest part of the bust and 28" on the underbust.
Calculation = 35"– 28" = 7” difference.

If you check the chart below it means that our model would be a 32D.

Use our below guide to determine your cup size.

Full bust measurement (minus)-
underband measurement =

Cup Size
3” AA cup
4” A
5” B
6” C
7” D
8” DD
9” E
10” F
11” FF
12” G
13” GG
14” H
15” HH

Bra Sizing

Bra sizing might appear to be complicated but as long as you understand some basic rules, it is pretty easy to get your head around.

It is important to remember that the band size and cup size of a bra always work together. A ‘DD’ cup size is not always a larger cup capacity than a ‘D’ cup – it all depends on the band size. In fact, a 34B cup size has the same cup capacity as a 32C and a 36A – the only thing that is differs is the band size.

Sizes 38B, 36C, 34D, 32DD and 30E all have the same cup capacity. The only difference in size is the size of the band. It is essential that you choose the correct band size AND cup size if you are to be properly supported in your bra.

Please also be aware that sizes can vary per country so it is important to check against the below sizing chart if you are not sure of the UK conversion.

30 30 80 0 8
32 32 85 1 10
34 34 90 2 12
36 36 95 3 14
38 38 100   4    16
A     A A     A A
B B B B or none   B
XS 8 4-6 36    40    8 7
S 10   6-8 38 42 10 9
M 12 8-10 40 44 12 11
L 14 10-12 42 46 14 13
XL 16 12-14 44 48 16 15
XXL 18 14-16 46 50 18

Now you have figured out what size lingerie you should be wearing, head on over to our Lingerie page where it will be easy to shop for you correct size!