Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Current Amperes (A)

Required number input.

Length Meters (m)

Required number input.

Resistance Ohms Per Meter (Ω/m)

Required number input.

Resistive single-phase two-wire voltage drop 2IRL using one-way conductor length and resistance per meter; ignores reactance. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Voltage Drop Volts (V)

The resulting voltage drop volts returned as a number.

• Electrical estimates require the correct AC or DC model, RMS and phase conventions, source impedance, grounding, conductor conditions, protection, temperature, harmonics, faults, and applicable standards. Nominal ratings are not automatically compatible design limits.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Power Factor Correction Capacitor

  Ideal single-phase shunt capacitance needed to raise lagging power factor at fixed real power, RMS voltage and frequency.

• Thermal Resistance Series

  Total thermal resistance of two one-dimensional heat-flow layers connected in series at the same heat rate.

• AWG Diameter

  Nominal solid conductor diameter from American Wire Gauge number, using d(in)=0.005·92^((36−AWG)/39). Use -1 for 2/0, -2 for 3/0 and -3 for 4/0 AWG; zero is 1/0.