Electronics
A 65 watt laptop costs about $0.09 to run for 8 hours at $0.17 per kWh.
Quick estimate
This uses 65 watts, 8 hours per day, and an electricity rate of $0.17 per kWh.
Laptops usually use modest electricity, with higher draw while charging, gaming, rendering, or using maximum brightness.
Many laptop units fall around 65 watts, with a rough range of 30 to 120 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 | 30W | 4 | $0.02 | $0.61 |
| Typical use | 65W | 8 | $0.09 | $2.65 |
| High estimate | 120W | 12 | $0.24 | $7.34 |
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 laptop example: 65 / 1000 x 8 x 0.17 = $0.09 per day.
These details make this estimate more useful for real-world use.
A laptop power adapter rating is a maximum output, not necessarily what the laptop uses all day. Power draw is usually higher while charging the battery or doing demanding work, and lower during light browsing or writing.
The laptop itself may be inexpensive to run, but external monitors, docks, speakers, and other accessories can add to the total. For a work-from-home setup, include the whole desk setup if you want a realistic estimate.
Use sleep mode, reduce brightness, and unplug accessories you do not need.
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 65 watt laptop costs about $0.09 to run for 8 hours at $0.17 per kWh.
Use the wattage printed on the appliance label when possible. As a starting estimate, this page uses 65 watts and shows a common range of 30 to 120 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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