Electrical Calculators

Free electrical engineering calculators for voltage drop, wire gauge, breaker sizing, Ohm's law, and motor current.

Voltage Drop Calculator — Calculate voltage drop across a wire run. Find out if your conductor size is adequate for the load and distance.
Wire Gauge (AWG) Calculator — Find the correct AWG wire size for a given current load. Based on NEC ampacity tables for copper conductors.
Breaker Size Calculator — Calculate the correct circuit breaker size for a given load. Follows NEC 210.20 and 240.6 standard breaker sizes.
Ohm's Law Calculator — Calculate voltage, current, resistance, or power using Ohm's Law. Enter any two values to find the other two.
Motor Full-Load Current Calculator — Estimate the full-load current (FLA) of a single-phase or three-phase AC motor from its horsepower and voltage rating.