Is there an accurate chart anywhere for Wire gauge for amperage/power?

I'm changing my set up and significantly increasing my power. I'm just wondering what the easiest way to facilitate this is.

Ive got a 4 gauge run of wire (15' maybe) to the back of my car, and i have 2 USA 150's (480 RMS a piece) however i probobly only draw half that power from them.

I'm adding an eclipse amp that puts out somewhere around 1000 rms.

0 gauge, and 0 gauge kits seem to be pretty pricey. would it be simpler for me to just run another length of 4 gauge for the one amp?

I checked out charts on the web, but they seem to differ. I understand its not an exact science due to differances in cables, i just want to be safe.

Thanks
Nathan

 

There is an Excel file called Audio Calculator ....

 

Ya, just looked in the technical discussion forum and found the sticky.....

sorry for not doin my homework

 

princess auto has some nice 0gauge for ya. didnt check the price cause there wasnt any but should do. its welding cable. copper is copper so whater you can grab get it lol. just make sure its 0gauge and not "wannabe" 0gauge

 

4 awg powering 1000wrms is just fine imo