Watts ↔ kWh Calculator
Calculate energy from power and time, or power from energy and time.
Power, time, and energy
Convert within power or energy units, then use explicit time to calculate between power and energy.
Why time is required
Watts measure power—a rate of energy use. Kilowatt-hours measure energy. A watt value alone cannot become kWh, and a kWh value alone cannot determine watts, without a duration.
For the bounded unit factors behind this relationship, use the energy conversion reference.