Electrical
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Instant electrical calculations for engineers, electricians, and students. No signup, no ads, works offline.
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All Calculators by Category
Power ↔ Current
Convert between watts, kilowatts, amps and volts for DC, single-phase and three-phase circuits — the core of every load calculation.
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Watts to AmpsA = W / (V × PF)
Convert power to current for DC, AC single-phase, and AC three-phase circuits.
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Amps to WattsW = A × V × PF
Calculate power in watts from a measured current and voltage.
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kW to AmpsA = (kW × 1000) / (V × PF)
Convert kilowatts to amps for DC, single-phase, and three-phase circuits.
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Watts to VoltsV = W / A
Calculate voltage from watts and amps or watts and resistance.
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Amps to VoltsV = I × R
Apply Ohm's Law: calculate voltage from current and resistance.
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Apparent Power (kVA & VA)
Work with apparent power, real power and power factor when sizing generators, UPS units and transformers.
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kVA to kWkW = kVA × PF
Convert apparent power (kVA) to real power (kW) using the power factor.
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kVA to AmpsA = (kVA × 1000) / V
Find current in amps directly from apparent power and line voltage.
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VA to WattsW = VA × PF
Convert volt-amperes to real power in watts or kilowatts.
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Energy & Running Cost (kWh)
Turn power and time into energy used, then estimate what an appliance costs to run.
Battery Capacity
Compare batteries and power banks by converting between milliamp-hours and watt-hours.
Motors & Horsepower
Size motor circuits and convert between horsepower, kilowatts and amps.
Wiring & Safety Sizing
After finding amps, size wire and breakers and check voltage drop to code.