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How Much Does a Space Heater Cost to Run? Per Hour, Per Day and Per Month
Work out what your electric space heater costs per hour, day and month using its wattage and your own rate per kWh. Includes a table and calculator.
Photo by Donald Teel on Unsplash
Quick answer: a space heater costs its wattage in kilowatts × hours on × your price per kWh. A common 1,500-watt heater uses 1.5 kWh per hour at full power. At an example rate of $0.17 per kWh, that is about $0.26 per hour. Your real rate is on your bill.
The formula
Cost = kilowatts × hours × price per kWh
Wattage is printed on the heater's label. Divide by 1,000 to get kilowatts. Your price per kWh is on your electric bill (look for the total cost divided by kWh used, so delivery fees are included).
Example table
These figures use an assumed rate of $0.17 per kWh, only to show the method. It is not your rate, so replace it with yours.
| Heater power | Use per hour | Cost per hour | 8 hours a day for 30 days |
|---|---|---|---|
| 750 W | 0.75 kWh | $0.13 | $30.60 |
| 1,000 W | 1 kWh | $0.17 | $40.80 |
| 1,500 W | 1.5 kWh | $0.26 | $61.20 |
Calculate yours
Why the real number is often lower
Most heaters have a thermostat. Once the room reaches the temperature you set, the heater cycles off, so it is not drawing full power every minute. The label shows the maximum. Room size, insulation and the setting you choose all change how long it runs.
Ways to spend less
- Heat only the room you are using and close the door.
- Use a thermostat or timer so it does not run when nobody is there.
- Seal drafts around windows and doors.
- Check the Department of Energy's safety tips before leaving any heater on, and keep it away from anything that can burn.
For whole-home ideas, see how to lower your electric bill.
FAQ
How much does a 1,500-watt heater cost per month? With 8 hours a day at $0.17 per kWh it would be about $61, but your hours and rate will differ.
Is a space heater cheaper than central heating? It depends on your fuel prices and how many rooms you heat. Compare using your own bills.
Where do I find the wattage? On the label or rating plate, usually on the back or bottom.
Next steps
Find your heater's wattage and your rate per kWh, then use the calculator. To estimate other devices, read how much electricity an appliance uses.
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To compare other appliances:
