Calculators
Reference

Calculators

All calculators
Voltage Drop
Wire & Ampacity
Conduit & Box Fill
Load & Service
Motors & Transformers
Conversions

Reference

AWG Wire Chart
Ampacity Chart
Conduit Fill Chart
NEMA Plug Chart
Wire Color Codes

Conversions

Ohm's law and common electrical unit conversions.

Ohm's Law Calculator: Solve for voltage, current, resistance, or power. Enter any two values.
Power Factor Calculator: Calculate power factor and solve the power triangle (kW, kVA, kVAR).

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Free electrical calculators for electricians and engineers. For estimation only.

Calculators

Voltage Drop
Wire Size
Conduit Fill
Breaker Size
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Reference

AWG Wire Chart
Ampacity Chart
Conduit Fill Chart
NEMA Plug Chart
Wire Color Codes

For reference only. Verify all results with the current NEC, local codes, and a licensed electrician before any real installation. Full disclaimer