Wire Resistance Calculator — Free Online Calculator
Calculate the DC resistance of copper or aluminum wire per foot or meter for any AWG gauge size.
How to Use This Calculator
Select wire gauge and material, enter the total wire length. The calculator shows resistance per foot, per meter, and total resistance for the entire run.
The Formula Explained
Wire resistance depends on material resistivity, cross-sectional area, and length. R = ρL/A, where ρ is resistivity, L is length, and A is area. Copper has about 61% the resistance of aluminum for the same gauge.