Electrical Calculators
Free electrical engineering tools for voltage drop, Ohm's law, wire sizing, power conversion, and more. All calculations follow NEC (National Electrical Code) standards where applicable.
Power & Current
- Watts / Amps / Volts Calculator — Convert between watts, amps, and volts
- Ohm's Law Calculator (V/A/W/Ω) — Calculate V, I, R, and P from any two values
- kVA Calculator — Convert between kVA, amps, kW for single and three-phase
Wire & Voltage
- Voltage Drop Calculator — Calculate voltage drop per NEC for copper and aluminum wire
- Wire Size Calculator — Find the right AWG wire gauge for your circuit
Components
- Resistor Color Code Calculator — Decode 4, 5, and 6-band resistor values
- Parallel Resistor Calculator — Calculate total resistance for 2–10 parallel resistors
Unit Converters
- Milliamps to Amps — Convert mA to A (1 A = 1,000 mA)
- Amps to Milliamps — Convert A to mA
- mAh to Wh Converter — Convert milliamp-hours to watt-hours for batteries
- Wh to mAh Converter — Convert watt-hours to milliamp-hours
Related Construction Calculators
- Construction Calculators — material estimates for building projects
- Fence Calculator — posts and wiring for electric fences
Related Converters
- Power Converters — HP ↔ Watts, kW, BTU/hr, and more
- Energy Converters — kWh, Joules, BTU, Calories, and more