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This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
The Voltage Drop Calculator will calculate the voltage drop across a circuit for long wire runs based on voltage, current, phases, conductor, wire size, and circuit distance. It will also calculate the voltage at the load, and the percent voltage drop.
Calculate voltage drop in an AC or DC circuit given wire gauge, voltage, current, and length. You can also determine the correct conductor size and length for a circuit given an allowable voltage drop.
Calculate Your Voltage Drop. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity.
3 phase calculation. The line to line voltage drop V in volts (V) is equal to square root of 3 times the wire current I in amps (A) times one way wire length L in feet (ft) times the wire resistance per 1000 feet R in ohms (Ω/kft) divided by 1000: Vdrop (V) = √ 3 × Iwire (A) × Rwire (Ω) = 1.732 × Iwire (A) × ( L(ft) × Rwire (Ω/kft) / 1000 (ft/kft))
Calculate the overall drop in voltage for DC and AC circuits with the voltage drop calculator. The tool uses the NEC and Wire Resistance equations for power loss across a load connected in a single-phase and three-phase supply system and tells you the actual potential fall in the whole circuit.
The Voltage Drop Calculator can help you determine which category your circuit falls under and whether any adjustments need to be made to improve its performance. Examples. To help you better understand how voltage drop calculations work, here are some examples of different individuals and their voltage drops:
