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Watts to kWh Calculator FullScreen

Convert power in watts (W) to energy in kilowatt-hours (kWh). Ideal for understanding the total energy consumption or generation over a specific period of time. Obtain an estimation of kilowatt-hours from watts using this practical online tool.

Enter power in watts: W
Enter time in hours: hr
Energy result in kilowatt-hours: kWh


What is Watts to kWh Calculator

To convert watts (W) to kilowatt-hours (kWh), you need to know the time (t) in hours (h) for which the power is consumed. The formula for converting watts to kilowatt-hours is:

kWh = (Watts (W) × Time (hours)) / 1000

First, multiply the power in watts by the time in hours, then divide by 1000 to obtain the energy in kilowatt-hours.

For example, if you have a device with a power consumption of 1000 watts (W) and it operates for 5 hours (h), you can calculate the energy consumed in kilowatt-hours as follows:

kWh = (1000 W × 5 h) / 1000 kWh = 5 kWh

In this example, the energy consumed by the device would be 5 kilowatt-hours.

Kilowatt-hours (kWh) is a commonly used unit of energy in electrical utility billing, representing the amount of energy consumed over time. It's important to note that this calculation assumes a constant power consumption over time. If the power consumption varies or if you are considering a situation where power changes over time, you may need to integrate or sum the power values at different time intervals to accurately determine the total energy in kilowatt-hours.

Watts to kWh calculation

The energy E in kilowatt-hours (kWh) is equal to the power P in watts (W),

times the time period t in hours (hr) divided by 1000:

E(kWh) = P(W) × t(hr) / 1000

Watts to kWh Calculator Example

To convert watts (W) to kilowatt-hours (kWh), you need to divide the power in watts by 1000 to get kilowatts (kW), and then multiply by the time in hours. The formula for calculating energy in kilowatt-hours is:

Energy (kWh) = Power (W) / 1000 × Time (h)

Here's an example table that demonstrates how to calculate energy in kilowatt-hours from different wattage values and time durations:

Watts (W) Time (h) Energy (kWh)
100W 5h 0.5 kWh
200W 10h 2 kWh
150W 8h 1.2 kWh
75W 3h 0.225 kWh

To calculate the energy in kilowatt-hours, first convert the power in watts to kilowatts by dividing by 1000. Then multiply the result by the time in hours. For example, if you have 100W of power and a time duration of 5 hours:

Energy (kWh) = (100W / 1000) * 5h Energy (kWh) = 0.5 kWh

Therefore, for 100W of power over 5 hours, the energy consumption is 0.5 kilowatt-hours.

Perform the same calculation for the other examples in the table using the given wattage and time values to obtain the energy in kilowatt-hours.

Ensure that the power is converted to kilowatts (kW) and the time unit is consistent with hours when performing the calculation.