AC / DC Voltage Drop Calculator
A more complete engineering check. Select DC, single-phase AC or three-phase AC, then include conductor resistance, reactance, power factor, conductor temperature, circuit length and design limit.
Enter project values and calculate.
What is included?
- Temperature-adjusted resistance using a conductor temperature coefficient.
- DC: ΔV ≈ 2ILR.
- Single-phase AC: ΔV ≈ 2IL(Rcosφ + Xsinφ).
- Three-phase AC: ΔV ≈ √3IL(Rcosφ + Xsinφ).
- Pass/fail comparison against your chosen percentage limit.
R and X must be representative of the actual cable/construction and installation. For final design use manufacturer data and the governing electrical standard.