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kW to kWh Calculator

Convert power to energy

Result

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kWhE = P × t

Where:
E = Energy (kWh)
P = Power (kW)
t = Time (hours)

Understanding kW vs kWh

kW (kilowatts) measures power—the rate of energy consumption at any moment. kWh (kilowatt-hours) measures energy—the total power consumed over time.

Think of kW as the speed of your car (rate) and kWh as the distance traveled (total). A 2 kW heater running for 3 hours uses 6 kWh of energy.

Multiply power in kW by time in hours: kWh = kW × hours. For example, 5 kW for 4 hours = 20 kWh.

A 1500W (1.5 kW) heater running 8 hours/day uses: 1.5 kW × 8h = 12 kWh per day.