Wire gauge for extending factory wiring

Hi,

Im currently needing to extend part of my power supply loom and am kind of stumped as to what wires to buy for the job.

I have roughly measured the conductor diameter of the factory wires. The wire thicknesses are roughly: 0.81mm, 1.29mm, 1.45mm, 1.63mm, 1.83mm, 2.3mm and 3.26mm.

I had a look around online for some conversion tables but all tables and calculators ive found are different to each other so really not sure.

Can anyone here help out?

Cheers

Here's a link to a conversion chart that should help you out:

https://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html