Calculate your cost
Start with a representative input, then edit all three numbers.
This setup uses about 225 kWh in a 30-day month.
Please enter valid values within the ranges shown.
| Schedule | Hours/day | Cost/month |
|---|---|---|
| Half runtime | 2.5 | $21.18 |
| Starting point | 5 | $42.37 |
| Longer runtime | 7.5 | $63.55 |
Same 1,500-watt input and 18.83¢/kWh rate; only runtime changes.
The quick formula
1.5 kW × 5 hours × $0.1883 = $1.41 per day
Convert watts to kilowatts, multiply by the active hours used each day, then multiply by the electricity price in dollars per kWh. Multiply the daily result by 30 for the monthly estimate shown above.
How to read this estimate
Most plug-in space heaters draw close to the maximum load of a standard household outlet when heating at full power. Even a small heater can therefore add a noticeable amount to a monthly bill when it runs for several hours every day.
The starting values keep this page useful before you have a label or meter reading. They do not describe every model, climate, operating mode, or household.
What changes the cost?
- 01
High, low, or thermostat-controlled heat setting
- 02
Room insulation, drafts, and outdoor temperature
- 03
Daily runtime and whether the heater cycles off
Ways to spend less
- Heat the occupied room and keep doors closed.
- Use the thermostat instead of leaving the heater on continuously.
- Stop drafts around doors and windows before increasing the setting.