Watts to kWh Calculation - Online Electrical Calculators

Watts (W) to Kilowatt-hours (kWh) Calculator.

Enter Real Power (P) in Watts (W) and Time (t) in hours (hrs) and press the Calculate button to get the Energy (E) in Kilowatt-hours (kWh):


Watts To kWh Calculator

Note, For higher values like 5×103, 10×10-6, 1.6 x1012, enter the value like this for scientific notation as 5e3, 10e-6, 1.6e12, etc.

Conversion Using the Power Formula :

AC Single Phase kWh to Watts Calculation:

The Energy (E) in kilowatt-hours (kWh) is equal to the Real Power (P) in watts (W), times the time period (t) in hours (hrs) divided by 1000:

For example, Let’s find the kWh of 1,500 watts for 2.5 hours.

E(Kwh) = P(W) x t hrs ÷ 1000

E(Kwh) = 1500 x 2.5 ÷ 1000

Kwh = 3.75


    • E= Energy in Kilowatt-hours (Kwh)
    • P = Power in watts
    • T = time in hours
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How to use This Calculator?

To use the above “Watts (W) to Kilowatt-hours (Kwh) Conversion Calculator” follow the below steps:

1. Enter Real Power: Input the Real Power in watts or motor watts value in the specific input box. You can enter the value in Watts or kilowatts by choosing the appropriate option from the dropdown.

2. Enter Time: Input the time in hours value in the specific input box. You can enter the value in hours or seconds by choosing the appropriate option from the dropdown.

how to use calculator watts to kwh

3. Reset: Click the “Reset” If you want to reset the calculator to perform another conversion, you can click the “Reset” button, and all input fields will be cleared.

4. Calculate: Click the “Calculate” button to obtain the results. The calculated results will be displayed in the “Results:” section.

5. Swap: If you want to “Swap” the calculated to Exchange conversion, you can click the “Swap” button, and Calculate will be Exchange.

6. Result: The calculated “result” will be displayed in the respective “Result In Kilowatt-hours (kWh)” output field.

Watts to Kwh Conversion table:

Watts (W) to Kilowatt-hour (Kwh) Conversions Table.
Watts Kilowatt-hours Electricity Cost
100W 0.1 Kwh $0.014 Per hr
200W 0.2 Kwh $0.024 Per hr
300W 0.3 Kwh $0.036 Per hr
400W 0.4 Kwh $0.048 Per hr
500W 0.5 Kwh $0.060 Per hr
600W 0.6 Kwh $0.072 Per hr
700W 0.7 Kwh $0.084 Per hr
800W 0.8 Kwh $0.096 Per hr
900W 0.9 Kwh $0.108 Per hr
1000W 1 Kwh $0.12 Per hr
1100W 1.1 Kwh $0.132 Per hr
1200W 1.2 Kwh $0.144 Per hr
1300W 1.3 Kwh $0.156 Per hr
1400W 1.4 Kwh $0.168 Per hr
1500W 1.5 Kwh $0.18 Per hr
1600W 1.6 Kwh $0.192 Per hr
1700W 1.7 Kwh $0.204 Per hr
1800W 1.8 Kwh $0.216 Per hr
1900W 1.9 Kwh $0.228 Per hr
2000W 2 Kwh $0.24 Per hr
Assuming a price of $0.14 per kWh

Frequently asked questions

What is 2 kWh?

2 kilowatt-hour is defined as the amount of work done or energy consumed when a device of Real power kilowatt is used for 2 hours at rated voltage. It is the measurement of electrical energy equivalent to the Real power (P) consumption.

How many kWh is 12 unit?

12 unit of electricity = 12 kWh. The electricity used is generally charged for in “unit of electricity'. Killowatt-hours is the product of watts x time (1 kilowatt = 1000 watts). A 4-kilowatt heater switched on for 3 hours will have used 12 kilowatt-hours of electricity.

What is kWh?

Kilowatts-hour (kWh) is the unit used to express the energy (E) consumption of an appliance or load.

What is Energy?

Energy is defined as the product of power and time. For constant value, it is expressed as:
energy = power * time

What is a Kilowatt?

Since a watt is a relatively small unit of electricity, it is common for it to be measured in multiples, like a kilowatt (kW). A kilowatt, as we mentioned, is just 1,000 watts (W).

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