How Much Does It Cost To Run A 100 Watt Light Bulb?


The cost of running a 100 watt light bulb is easy to calculate. First, if you run a 100 watt light bulb for 10 hours, you would use 1000 watts of power, or the equivalent of 1 kilowatt. Since the cost of electricity varies from area to area, and the cost per kilowatt hour is based on the amount of usage, the following rational should be close to being accurate. Because of the sliding scale of usage is from about $.08 -$.25 per kWh, multiply the amount of usage by the cost per kWh and that will give you the total cost.
1 Additional Answer
There are a number of factors to consider. These include, how long you are running the light bulb for and the cost of electricity in your area. If you left on a 100 watt bulb for a full month, you would use 73 Kilowatt hours (kWh). If you are being charged 12 cents per kWh for electricity, then it cost $8.76 to run a 100 watt light bulb for one month. You can find more information at
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