Heating & Cooling
A typical 1,500 watt space heater costs about $1.02 to run for 4 hours at $0.17 per kWh.
Quick estimate
This uses 1500 watts, 4 hours per day, and an electricity rate of $0.17 per kWh.
Space heaters often run at their full rated wattage while heating, so hours of use matter more than almost anything else.
Many space heater units fall around 1500 watts, with a rough range of 750 to 1500 watts. Check the product label, user manual, or manufacturer specifications for the most accurate number.
| Estimate | Watts | Hours per day | Daily cost | Monthly cost |
|---|---|---|---|---|
| Low estimate | 750W | 2 | $0.26 | $7.65 |
| Typical use | 1500W | 4 | $1.02 | $30.60 |
| High estimate | 1500W | 6 | $1.53 | $45.90 |
Convert watts to kilowatts, multiply by the number of hours used, then multiply by your electricity rate.
Cost = Watts / 1000 x Hours Used x Electricity RateFor this space heater example: 1500 / 1000 x 4 x 0.17 = $1.02 per day.
These details make this estimate more useful for real-world use.
A space heater is often a simple resistance heater, which means most of its electrical input becomes heat. That makes the math straightforward: if a 1,500 watt heater runs for several hours, it can use more energy than many larger appliances that cycle on and off.
Space heaters are usually most practical for short sessions in a single occupied room. They are less efficient as a whole-home heating strategy, especially if doors are open or the heater runs continuously.
Use the lowest heat setting that keeps the room comfortable and close doors to avoid heating unused spaces.
The easiest way to improve the estimate is to replace the default values with your actual wattage, average runtime, and local electricity rate.
Wattage ranges are practical planning estimates for common household appliances. Actual use can differ by model, age, settings, room conditions, and maintenance.
A typical 1,500 watt space heater costs about $1.02 to run for 4 hours at $0.17 per kWh.
Use the wattage printed on the appliance label when possible. As a starting estimate, this page uses 1500 watts and shows a common range of 750 to 1500 watts.
Electricity bills include many appliances, fees, taxes, seasonal changes, and utility rate structures. This calculator estimates appliance energy cost only.
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