Energy calculators for electricity, power and consumption

Calculate kWh and electricity cost from the appliance's power, usage time and your electricity price.

Calculate the electricity use and cost of a trip with your consumption, charging losses and electricity price.

Calculate the heat pump's electricity use, running cost and payback from your heat demand.

Compare heating types with the same heat demand using fuel, efficiency and fixed costs.

Calculate recovered heat, extra electricity and net savings for a ventilation system.

Find mixed shower water from the tank's volume and temperatures, plus the heating time.

Find the water use, heat energy and price of a shower and per year.

Calculate nominal Wh and kWh from the battery's voltage and capacity in Ah.

Find watts, volts or amps for direct current when you know the other two.

Calculate active power for single-phase or balanced three-phase alternating current.

Calculate voltage, current or resistance when you know the other two.

Find the electrical power dissipated in an ohmic resistor.

Find the total resistance of resistors connected in series or in parallel.

Calculate how many years an investment takes to pay for itself with a fixed annual saving.