You can try this online calculator. It is more detailed than some others you may find but is well explained. http://www.smps.us/mobile/pcb-calculator.html

it says i need some huge width traces, which wont fit.. so i guess ill have to figure something else out. would using 2 tracks (on on bottom and top layer) effectively double the the double the track width? im extremly new to this. sorry

http://puu.sh/qeUkd/83ffbb6d51.png thats a relay. essentiall if all tracks were 10mil would doing this give me a width of 20? should i not do this?

Assuming top and bottom copper is the same weight then putting a 10 mil track on top layer in parallel with a 10mil track (of the same length) on bottom layer gives the equivalent of a 20mil track. You can also put copper on inner layers but: 1) inner copper weight may be lower than on outer layers; 2) traces on inner layers get hotter than on outer layers for the same trace resistance because they are enclosed by PCB material. **Note that:** * You can go to more layers (in fact up to 16). https://easyeda.com/Doc/Tutorial/PCBOrderFAQ#PCB-Stack-up * You can ask for special copper weights. https://easyeda.com/Doc/Tutorial/PCBOrderFAQ#Copper-Weight

great this helps a lot. thanks a lot! also really love the quick responses