Free NEC Tools for Electrical Professionals

Fast electrical calculations based on the National Electrical Code. No account required.

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Popular NEC Tools

NEC Load Calculator

Calculate residential and commercial electrical loads using NEC-based workflows.

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Voltage Drop Calculator

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Estimate voltage drop for branch and feeder conductors.

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Conductor Sizing

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Ampacity and OCPD sizing based on NEC conductor tables.

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Box Fill Calculator

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Verify box fill compliance for conductors and devices.

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Built for electricians, contractors, estimators, inspectors, and electrical professionals in the United States.

No account required to start.