Like this, but you have to go through each aim in BF3 VU and use the hipfire sensitivity from the first conversion to get their respective sensitivity. The FOV that is filled in for the aims is the default FOV, if you haven't changed it just leave it as it is.
Hipfire:
https://www.mouse-sensitivity.com/?share=35e4d7ca30bff427affab3f3aef74d82
3.4X:
https://www.mouse-sensitivity.com/?share=80da55a006babc1a55fbbee283561d63
And so on.