NEC-compliant tools for wire sizing, conduit fill, voltage drop, and more. Built for electricians and DIYers.
Wire gauge, voltage drop, ampacity, and circuit breaker calculators for NEC-compliant wiring.
Conduit fill, bending, pull box sizing, support spacing, and cable tray calculators.
Ohm's law, three-phase power, electrical load, generator sizing, and energy cost calculators.
GFCI/AFCI requirements, grounding, fault current, lighting design, and project cost estimators.
Determine the correct AWG wire gauge based on amperage, distance, voltage, and acceptable voltage drop.
Calculate voltage drop over a wire run to determine if your circuit meets NEC recommendations.
Calculate conduit fill percentage per NEC Chapter 9 to ensure your wiring installation is code compliant.
Calculate voltage, current, resistance, and power from any two known electrical values using Ohm's Law.
Convert between watts, amps, and volts for single-phase and three-phase electrical circuits.
Calculate total electrical load for a residential panel using NEC Article 220 Standard Calculation method.
Calculate how many light fixtures are needed to properly illuminate a room based on foot-candle requirements.