Enter a power in kilowatts and a number of hours to find the total energy consumed in kilowatt-hours.
How to Use the Kilowatts to Kilowatt-Hours Calculator
Enter a power rating in kilowatts and how many hours it ran. The total energy consumed over that stretch appears in kWh, recalculated on every change.
Sizing an Output, Not Just a Bill
This isn't only a billing question. A 5 kW solar array producing at that rate for 4 peak-sun hours a day generates 20 kWh daily — a figure a homeowner needs before comparing panel output against a household's actual consumption, long before any electricity rate enters the conversation. The same multiplication works for a generator's rated output over a run time, or a heater's nameplate kW over an evening of use.
Energy (kWh) = Power (kW) × Time (hours)Kilowatts describe a rate that exists at every instant a device runs; kilowatt-hours describe the total that accumulates once a duration is attached. Neither number substitutes for the other, which is why a spec sheet lists one and a utility bill charges for the other.