Found an online wire gauge calculator for DC currents - Maybe useful to you??

Flashlight Modding and DIY Parts
1

This here site has a built in calculator where you input current (A) , voltage (V) and acceptable cable loss (%) as well as length of cable (M) of your project. Note that it does not accept comma separation inputs.

I thought it might be of help to someone out there :-)

EDIT:

I forgot to mention that the only thing that is missing from the calculator is a temperature input.

If you reckon a wire will be working in the 20°C range then this should be spot on. But any higher and your losses will start climbing.

The temperature coefficient of resistance for copper is 0,004041 which equates to around 10 % rise in resistance for every 25°C. (Rule of thumb - good for quick guesstimations only)

2

Looks interesting. I didn’t check the math to see if it was sane, but it did take an input of 0.06 for length (6 centimeters). At 3 Amps and 4 Volts for 1% max loss, calculator says 24AWG. Seems ‘reasonable’.

PPtk

3

I did something similar to a few currents, %-ages and voltages and it seems very reasonable yes.

I like that it shows both metric and imperial measures as results. Comes in handy when shopping internationally.

4

its good, i bookmarked it, thanks