Space Heater Cost Calculator
A space heater costs money for every hour it runs. Enter its power, how long it runs and your electric rate to see the energy and cost for a month.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Divide the watts by 1,000 to get kilowatts. Multiply by the hours a day and the days in the month to get kilowatt hours, the unit your power company bills. Then multiply by your price per kilowatt hour.
The wattage on the label is often the top setting. A heater on a lower setting, or one that switches off on a thermostat, uses less, so the real figure may be lower.
Worked example
A 1,500 W heater running 6 hours a day for 30 days uses 270 kilowatt hours in a month. At your rate, that is $43.20 for the month.
Questions
Where do I find my price per kilowatt hour?
Look at your bill for the energy or supply charge per kWh. If your bill has several rates by time of day, use the rate for the hours the heater runs.
Why is my bill higher than this?
Bills include fixed charges and other fees, so the heater is only part of the total. This shows the heater's own cost.
Does a thermostat change the cost?
Yes. A heater that cycles on and off uses less than its full running time, so enter the hours it actually runs.
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