Electrician calculator Iincludes Power/Ohm’s Law, Voltage Drop, Wire Size, and Conduit Fill calculators
Electrician Calculator
Fast calculations for power, Ohm’s law, voltage drop, conductor selection and conduit fill. Built for estimates and planning.
Power & Ohm’s Law
Enter any two known values. The calculator fills in the rest.
Known values
Calculated values
Voltage Drop Calculator
Estimates drop on a single-phase or three-phase copper/aluminum run.
Circuit details
Conductor details
Calculation uses DC resistance at 75°C. It does not account for reactance, power factor or terminations.
Wire Size Estimator
Select a conductor based on the calculated load, with a 125% continuous-load option.
Load details
Recommendation
Based on a simplified 75°C ampacity reference. Verify your local electrical code, terminal ratings, derating and voltage-drop requirements.
Conduit Fill Estimator
Calculate fill percentage from the internal conduit area and total insulated conductor area.
Conduit and conductor
Result
Common maximum fills are 53% for one conductor, 31% for two, and 40% for three or more. Confirm the applicable code tables for your raceway and insulation.

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