Power Calculators

Free online power calculators tools. Convert and calculate power calculators values instantly in your browser.

Calculate electrical power from voltage, current, or resistance. Enter any two values to find power in watts.

Convert watts to amps for DC, AC single phase, and AC three phase circuits. Enter watts, volts, and power factor to get current in amps.

Convert amps to watts for DC, AC single phase, and AC three phase circuits. Enter current, voltage, and power factor to get power in watts.

Convert kVA to kW using power factor. Also calculates reactive power (kVAR). Essential for generator and UPS sizing.

Calculate power in watts from voltage and current for DC, AC single phase, and AC three phase circuits.

Calculate the cost of running an appliance based on wattage, hours of use, and electricity rate.