This calculator helps you convert power in kilowatts (kW) to energy in kilowatt-hours (kWh) over a specified duration. It’s commonly used to estimate energy use from electrical appliances or machinery based on runtime.
Kilowatts (kW) to Kilowatt-Hours (kWh) Converter
Enter power in kW and duration in hours to calculate energy consumption in kilowatt-hours.
Power (Kilowatts)
Time (Hours)
Result in Kilowatt-Hours (kWh)
How to Use This Calculator
- Enter the power value in kilowatts into the “Power (Kilowatts)” field.
- Enter the time in hours into the “Time (Hours)” field.
- Click the “Convert” button to get the result in kilowatt-hours.
- The result appears in the output field along with the calculation breakdown.
- Use “Copy Result” to copy the value. Use “Clear All” to reset the form.
- You can adjust the decimal precision using the “Decimal Places” selector.
- Click “Swap” to go to the reverse kWh to kW tool.
Definitions of Units
Kilowatt (kW)
A kilowatt is a unit of power equal to 1,000 watts. It represents the rate at which energy is used or generated. For example, a 2 kW heater consumes 2 kilojoules per second. It is part of the SI (International System of Units).
Hour (h)
An hour is a non-SI unit of time equal to 3,600 seconds. It’s widely used to express durations, including the operating time of electrical equipment or machinery.
Kilowatt-Hour (kWh)
The kilowatt-hour is a measure of energy consumption or production. It equals the amount of energy used by a device drawing 1 kilowatt of power for 1 hour. 1 kWh = 3.6 million joules (J). It is a standard billing unit for electrical energy in homes and businesses.
Conversion Formula
To convert kilowatts (kW) to kilowatt-hours (kWh), multiply the power by the time in hours:
kWh = kW × hours
Source: U.S. Department of Energy – Estimating Appliance and Home Electronic Energy Use
Conversion Table (kW to kWh)
| Power (kW) | Time (Hours) | Energy (kWh) |
|---|---|---|
| 0.5 | 1 | 0.5 |
| 1 | 1 | 1 |
| 2 | 1 | 2 |
| 1 | 2 | 2 |
| 3 | 2 | 6 |
| 2 | 3 | 6 |
| 4 | 2 | 8 |
| 5 | 2 | 10 |
| 6 | 2 | 12 |
| 3 | 5 | 15 |
| 4 | 5 | 20 |
| 5 | 5 | 25 |
| 6 | 5 | 30 |
| 7 | 5 | 35 |
| 8 | 5 | 40 |
| 9 | 5 | 45 |
| 10 | 5 | 50 |
| 12 | 6 | 72 |
| 15 | 4 | 60 |
| 20 | 3 | 60 |
Real World Examples
- Electric stove: 2.0 kW running for 1 hour = 2.0 kWh
- Dishwasher (heated dry): 1.5 kW for 1.5 hours = 2.25 kWh
- Clothes dryer: 3.0 kW for 1 hour = 3.0 kWh
- Microwave oven: 1.2 kW for 0.5 hour = 0.6 kWh
- Electric vehicle charger: 7.2 kW for 2 hours = 14.4 kWh
- Window AC unit: 1.8 kW for 3 hours = 5.4 kWh
- Water heater: 4.5 kW for 2 hours = 9.0 kWh
- Home HVAC system: 5.0 kW for 5 hours = 25.0 kWh
- Solar panel system: 6.0 kW for 6 hours of daylight = 36.0 kWh
- Electric furnace: 10.0 kW for 3 hours = 30.0 kWh
What are you using this calculator for? Let us know in the comments below — and tell us if you’d like additional features or conversions added.
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