SpecCalc Hub · Medium/High
Voltage Drop Calculator
Estimate voltage drop using conductor material, area, length, current, voltage, system type, and power factor.
Formula
R = ρ * length / area DC/single-phase drop = 2 * I * R * PF three-phase drop = √3 * I * R * PF voltage_drop_percent = drop / voltage * 100
Assumptions
- Inputs are user-provided.
- Results are preliminary estimates.
- Simplified resistance-only calculation.
Limitations
- Does not check ampacity, protection, installation method, grouping, insulation, temperature, fault conditions, or local code.
Methodology
Uses standard simplified resistivity-based voltage drop equations.
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.