16th October 2019

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# How much energy is in a kilowatt hour?

The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.

Similarly, you may ask, what is the difference between a kilowatt and a kilowatt hour?

A kilowatt-hour is the amount of energy equivalent to a power of 1 kilowatt running for 1 hour. If you leave a 100 Watt light bulb on for 1 hour, you've done gone and used up 100 watt-hours. But your electric company will bill you by the kilowatt-hour, so you'll get a bill for .1 kWh, multiplied by your per-kWh rate.

How do I calculate kWh from kW?

Method 1 Estimating Kilowatt Hours from Appliance Labels
1. Find the wattage on the appliance label.
2. Multiply wattage by hours used each day.
3. Divide the result by 1,000.
5. Multiply by the cost of electricity per kWh.

How many watts is a kilowatt hour?

Convert to Kilowatts. But electricity is measure in kilowatt hours on your electricity bill. Since we know that 1 kilowatt is equal to 1,000 watts, calculating how many kWh a particular device uses is as easy as dividing by 1,000.