Easy Steps to Convert Your Traditional Bra Size to our Better More Comfortable Sizing System

Finding Your Bra Lab size is super easy, especially if you already know your traditional bra size.  You can simply enter your size by clicking the button below

Convert size 


If you aren't sure of your bra size and want to measure first, here's how...It's slightly more complex, but still easy. You take a tape measure and measure around your bust, then band. This gives you two numbers. You can send us an email with these two numbers or use the chat box. 

If you want to do it yourself, the cup size can be calculated using the difference between bust size and band size. 
Bust/band difference in inches US cup size UK/AU cup size
<1 AA AA
1 A A
2 B B
3 C C
4 D D
5 E or DD DD
6 F or DDD E
7 G or DDDD F
8 H FF
9 I G
10 J GG
11 K H
12 L HH
13 M J
14 N JJ




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I love these bras! I’m too endowed to go without a bra, so these allow me to wear the backless or cut out shirts that are really popular, while still getting support.


OMG I LOVE this bra and how customizable it is. Instead of needing to get a bunch of different bras in different colors you can just get different straps and backs!


Customer for life! I just got mine in the mail and oh my gosh!! I'm in love! Time to buy a ton of backless shirts that I've never been able to wear before. The fit is amazing.


I'm so happy with my set! It's a struggle finding bras that have big cups and small bands and I LOVE the idea!