This calculator calculate the resistance of a copper trace based on width, length, thickness and temperature. The resistance of a trace is important to estimate the power dissipate in a trace or to estimate roughly the voltage drop from a voltage supply based on the current flowing through the trace. The resistance in real life will vary a bit since conductor are not exactly rectangular. The trace on a printed circuit boards is more of a trapezoidal shape.

The equation for resistance of a rectangular copper trace is :

where :

= Resistivity

L = Length

W = Trace width

T = Trace thickness (or height)

Tc = Temperature Coefficient

Temp = Temperature

This calculator used the following resistivity and temperature coefficient for copper :

Resistivity of copper :

Temperature Coefficient of copper :