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Space Heater Electricity Cost Calculator
Quickly estimate your hourly, daily, and monthly space heater electricity bills. Adjust the wattage and electric rate to match your local utility bill.
Space Heater Cost Calculator
Estimate how much electricity a portable space heater uses per hour, day, and month.
National US average is ~17¢/kWh. California & Northeast can reach 28–36¢/kWh.
Energy Tip: Running two 1,500W heaters full-time can add over $120–$180/month to your power bill. Lower your main thermostat to 65°F and only run a heater in the occupied room to maximize savings.
How Space Heater Electricity Costs Are Calculated
Electric resistance space heaters convert electrical energy directly into thermal energy with nearly 100% efficiency. The formula to calculate operating cost is:
The Formula:Cost = (Watts ÷ 1,000) × Hours Used × Electricity Rate ($/kWh)
Common Space Heater Benchmarks
| Heater Setting | Wattage | Cost / Hour (at 17¢/kWh) | Cost / 8 hrs / day | Monthly Cost (30 days) |
|---|---|---|---|---|
| Low Setting | 750 W | ~$0.13 / hr | ~$1.02 / day | ~$30.60 / mo |
| Medium Setting | 1,000 W | ~$0.17 / hr | ~$1.36 / day | ~$40.80 / mo |
| High / Typical Max | 1,500 W | ~$0.26 / hr | ~$2.04 / day | ~$61.20 / mo |
Is a space heater cheaper than running central heat?
It depends on where you spend your time. If you turn down your central thermostat by 7°–10°F and heat only the single occupied room (such as a home office or bedroom), a space heater can lower your total gas or heat pump bill. However, attempting to heat an entire floor or multiple rooms with portable electric heaters is significantly more expensive than running a modern heat pump or gas furnace.
Read Full Space Heater GuideHeat Pump vs Furnace CostLower Electric Bill in Winter