Watts To kWh: Watts To Kilowatt-Hours Calculator + Chart

All electric devices run on certain wattage, but we pay for electricity by kilowatt-hours (kWh). That’s we need to convert watts to kilowatt-hours in order to figure out the electricity cost. To help you with this, we have created a Watts To kWh Calculator and a chart for 10 watts to 10000 watts devices.

Example: Let’s say we run a 1000 watt device for 8 hours. How many kWh of electricity does this device use? Simple. Such a device will spend 1000 watt × 8 hours / 1000 = 8 kWh of electricity.

1000 watts to kwh
Running a small 1000 kWh electric heater for 8 hours will consume 8 kWh of electricity. With the US average national electricity price of $0.1319/kWh, that will cost us about $1.06 (addition to the electricity bill).

Let’s first look at the units we are converting:

  • Watts are a unit of electric power. Example: A device that draws 10 amps on 120V circuit is powered by 1200 watts.
  • Kilowatt-hours (abbreviation kWh) are a unit of electric energy. Electric energy (kWh) is not equal to electric power (watts). Rather, electric energy is calculated as electric power (watts) sustained for a certain amount of time (hours). 1 kWh is equal to 1000 Wh (watt-hours).

Namely, a unit will spend 1 kilowatt-hour of electric energy if:

  • 1000 watt unit runs for 1 hour.
  • 500 watt unit runs for 2 hours.
  • 250 watt unit runs for 4 hours.
  • 1 watt unit runs for 1000 hours.

Here is the formula that converts watts to kWh:

Kilowatt-hours (kWh) = Watts × Times (Hours) / 1000

Kilowatt-hours are calculated by multiplying watts by hours of use. We also have to divide the total by 1000 since 1 kilowatt (1 kW) is equal to 1000 watts (1000 W).

How many watts is a kilowatt hour

We can use this equation to create a simple calculator that converts watts to kWh:

Note: If you have issues converting watts to kWh, you can use the comment section below, give us some numbers, and we will help you out.

Watts To kWh Calculator

In this calculator, we just insert the wattage of our device and the number of hours we run this device. The calculator will automatically convert watts to kilowatt-hours:

 

Let’s look at an example of how this calculator works. We have a 2000 watt device and want to run it for 6 hours. Slide the 1st slider to ‘2000’ and the 2nd slider to ‘6’.

We get this result: Running a 2000 watt device for 6 hours will consume 12.00 kWh of electricity.

This is just one example. Let’s have a look at how many kWh will running 10 watts to 10000 watts devices use if we run them for 1 hour, 4 hours, 8 hours, and 24 hours:

Watts To kWh Chart (10-10000 Watts)

Watts: Time (1 Hour): Time (4 Hours): Time (8 Hours): Time (24 Hours):
10 Watts 0.01 kWh 0.04 kWh 0.08 kWh 0.24 kWh
20 Watts 0.02 kWh 0.08 kWh 0.16 kWh 0.48 kWh
30 Watts 0.03 kWh 0.12 kWh 0.24 kWh 0.72 kWh
40 Watts 0.04 kWh 0.16 kWh 0.32 kWh 0.96 kWh
50 Watts 0.05 kWh 0.20 kWh 0.40 kWh 1.20 kWh
60 Watts 0.06 kWh 0.24 kWh 0.48 kWh 1.44 kWh
70 Watts 0.07 kWh 0.28 kWh 0.56 kWh 1.68 kWh
80 Watts 0.08 kWh 0.32 kWh 0.64 kWh 1.92 kWh
90 Watts 0.09 kWh 0.36 kWh 0.72 kWh 2.16 kWh
100 Watts 0.10 kWh 0.40 kWh 0.80 kWh 2.40 kWh
150 Watts 0.15 kWh 0.60 kWh 1.20 kWh 3.60 kWh
200 Watts 0.20 kWh 0.80 kWh 1.60 kWh 4.80 kWh
250 Watts 0.25 kWh 1.00 kWh 2.00 kWh 6.00 kWh
300 Watts 0.30 kWh 1.20 kWh 2.40 kWh 7.20 kWh
350 Watts 0.35 kWh 1.40 kWh 2.80 kWh 8.40 kWh
400 Watts 0.40 kWh 1.60 kWh 3.20 kWh 9.60 kWh
450 Watts 0.45 kWh 1.80 kWh 3.60 kWh 10.80 kWh
500 Watts 0.50 kWh 2.00 kWh 4.00 kWh 12.00 kWh
600 Watts 0.60 kWh 2.40 kWh 4.80 kWh 14.40 kWh
700 Watts 0.70 kWh 2.80 kWh 5.60 kWh 16.80 kWh
800 Watts 0.80 kWh 3.20 kWh 6.40 kWh 19.20 kWh
900 Watts 0.90 kWh 3.60 kWh 7.20 kWh 21.60 kWh
1000 Watts 1.00 kWh 4.00 kWh 8.00 kWh 24.00 kWh
1100 Watts 1.10 kWh 4.40 kWh 8.80 kWh 26.40 kWh
1200 Watts 1.20 kWh 4.80 kWh 9.60 kWh 28.80 kWh
1300 Watts 1.30 kWh 5.20 kWh 10.40 kWh 31.20 kWh
1400 Watts 1.40 kWh 5.60 kWh 11.20 kWh 33.60 kWh
1500 Watts 1.50 kWh 6.00 kWh 12.00 kWh 36.00 kWh
1600 Watts 1.60 kWh 6.40 kWh 12.80 kWh 38.40 kWh
1700 Watts 1.70 kWh 6.80 kWh 13.60 kWh 40.80 kWh
1800 Watts 1.80 kWh 7.20 kWh 14.40 kWh 43.20 kWh
1900 Watts 1.90 kWh 7.60 kWh 15.20 kWh 45.60 kWh
2000 Watts 2.00 kWh 8.00 kWh 16.00 kWh 48.00 kWh
2500 Watts 2.50 kWh 10.00 kWh 20.00 kWh 60.00 kWh
3000 Watts 3.00 kWh 12.00 kWh 24.00 kWh 72.00 kWh
3500 Watts 3.50 kWh 14.00 kWh 28.00 kWh 84.00 kWh
4000 Watts 4.00 kWh 16.00 kWh 32.00 kWh 96.00 kWh
4500 Watts 4.50 kWh 18.00 kWh 36.00 kWh 108.00 kWh
5000 Watts 5.00 kWh 20.00 kWh 40.00 kWh 120.00 kWh
6000 Watts 6.00 kWh 24.00 kWh 48.00 kWh 144.00 kWh
7000 Watts 7.00 kWh 28.00 kWh 56.00 kWh 168.00 kWh
8000 Watts 8.00 kWh 32.00 kWh 64.00 kWh 192.00 kWh
9000 Watts 9.00 kWh 36.00 kWh 72.00 kWh 216.00 kWh
10000 Watts 10.00 kWh 40.00 kWh 80.00 kWh 240.00 kWh

With this watts to kilowatt-hour chart, you can easily figure out how many kWh does a device with certain wattage and running for a certain amount of hours consume.

You can use both the calculator and the chart. As mentioned before, if you have any problems converting watts to kilowatt-hours, you can use the comment section below and we will do our best to help you out.

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