DC Voltage Drop Calculator

Ensure critical sensors and actuators receive adequate voltage over long harness runs.

Notice: This interactive calculator requires JavaScript.

Manual Calculation Formula:
V_drop = Current (I) * Resistance (R)
R = (ρ * 2 * Length) / Area
Where ρ (Rho) for copper at 20°C is approx 0.0175 Ω·mm²/m. Length must be doubled for the return path.

System Voltage (V)

Current Draw (Amps)

One-Way Length (m)

Wire Cross-Section (mm²)

Voltage Drop

0.00 V

*Assumes copper wire at 20°C (Rho = 0.0175 Ω·mm²/m). Calculates total loop resistance (2x length).