Updated June 29, 2026
Space Heater Cost Per Hour Calculator
Calculate the hourly, daily, and monthly cost of running a space heater using its wattage and your electricity price.
Live calculator
Calculate your actual running cost
Running this space heater for 4 hours a day, 7 days a week uses about 182.0 kWh each month.
Quick answer
How much does a space heater cost to run?
A 1,500 W space heater used for 4 hours a day, 7 days a week, consumes about 182.0 kWh per month. At $0.30 per kWh, that is approximately $54.60 per month. Replace these example figures with the wattage and electricity rate from your appliance and bill.
What changes the real running cost?
Most plug-in space heaters use resistance heat, so their cost per hour is closely tied to the wattage setting selected on the heater.
If the thermostat cycles the heater on and off, reduce the hours to estimate active heating time rather than time plugged in.
Assumptions used in this example
This page starts with 1,500 watts, 4 hours of use per day, and 7 days per week. Those defaults are only a practical starting point. Replace them with the number on your product label, energy label, smart plug, or electricity bill.
Example space heater costs
These examples use 1,500 W for 4 hours a day and 7 days per week.
| Electricity rate | Per hour | Per month | Per year |
|---|---|---|---|
| $0.15 / kWh | $0.22 | $27.30 | $327.60 |
| $0.25 / kWh | $0.38 | $45.50 | $546.00 |
| $0.35 / kWh | $0.52 | $63.70 | $764.40 |
Ways to reduce the cost
Start with changes that reduce active runtime without compromising safety or the job the appliance needs to do.
- Use the lowest comfortable heat setting.
- Close doors to the room being heated.
- Never use damaged cords or cover a heater while running.
Estimate only. Actual consumption varies by model, setting, condition, temperature, duty cycle, and tariff. Use a plug-in meter or energy-label figure when accuracy matters.
FAQ
Space heater running cost questions
How do I calculate space heater running cost?
Divide the watts by 1,000 to get kilowatts, multiply by the hours used, then multiply by your electricity price per kWh. This page pre-fills 1,500 W, 4 hours per day, and 7 days per week as a starting example.
How much does a space heater cost per hour?
At 1,500 W and $0.30 per kWh, the example cost is about $0.45 per hour while it is actively using that power. Change the rate field to match your own bill.
Why might my real space heater cost be different?
If the thermostat cycles the heater on and off, reduce the hours to estimate active heating time rather than time plugged in.
Should I use rated watts or measured watts?
Rated watts are useful for a quick estimate, but measured wall power or an energy-label kWh figure is usually more accurate because many appliances cycle on and off or change power during use.
Does the calculator include standing charges, taxes, or demand charges?
No. The calculator estimates usage cost from kWh only. If your bill includes standing charges, taxes, delivery fees, or demand charges, add those separately.
Can I share my result?
Yes. Use the share or copy button after entering your wattage, hours, days, rate, and currency. The page stores those inputs in the URL so you can revisit the same estimate.