Conversion

Energy and power

Convert energy, work, heat and power units for everyday and technical uses.

Estimate solar panel payback time and net return from installation cost, electricity used on site, surplus sales and annual expenses.

Convert joules to thermochemical calories. Joules and small calories appear in heat and physics calculations.

Convert thermochemical calories to joules. Joules and small calories appear in heat and physics calculations.

Convert kilowatt-hours to joules. Electricity consumption is billed in kWh; joules are the standard energy unit in physics.

Convert joules to kilowatt-hours. Electricity consumption is billed in kWh; joules are the standard energy unit in physics.

Convert kilowatts to mechanical horsepower. Compare motor power when one specification lists kilowatts and another lists mechanical horsepower.

Convert mechanical horsepower to kilowatts. Compare motor power when one specification lists kilowatts and another lists mechanical horsepower.

Convert energy, work, heat and power units for everyday and technical uses.

Energy measures an amount used or stored, while power describes how quickly that energy is transferred or consumed.

Check whether the source gives energy or power, then keep the time period visible when comparing electricity use or appliance ratings.