8 calculators
Power & Energy
Watts, kilowatts, kWh, energy cost, amps-to-kW, and power conversion calculators.
Calculators
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Capacitor Energy Calculator
Calculate capacitor stored energy in joules from capacitance and voltage, solve required capacitance or voltage, and compare charge, watt-hours.
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Electrical Power Converter
Convert amps, volts, watts, kW, VA, kVA, horsepower, and ohms for DC, single-phase AC, and balanced three-phase AC with power factor and efficiency context.
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Electricity Bill Calculator
Estimate an appliance electricity bill from watts, hours, rate, billing days, fixed charges, and tax with presets, bill mix, and all-in kWh rate.
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Electricity Cost Calculator
Estimate appliance electricity cost from watts, use time, duty cycle, kWh rate, billing days, and annual use days.
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Energy Consumption Calculator
Calculate energy consumed in watt-hours and kilowatt-hours from constant power draw in watts or kilowatts and a runtime in hours or days.
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Energy Cost Calculator
Estimate appliance energy use and operating cost from wattage, quantity, runtime, billing days, and electricity price per kWh.
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Power Calculator
Calculate watts, volts, amps, or ohms from any two known electrical values with a power calculator that also works as a watt calculator, resistive load planner.
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Wattage Calculator
Calculate electrical power in watts from voltage and current, current and resistance, or voltage and resistance, with the exact working equation shown.
Related categories
Basic Circuits
Ohm's law, voltage divider, series and parallel resistance calculators.
Lighting
Lumens, lux, candela, LED wattage, and lighting layout calculators.
Wiring
Wire gauge (AWG), ampacity, voltage drop, and conduit fill calculators.
Electrical Converters
Electrical unit converters for charge, potential, resistance, capacitance, and more.