Computer Monitor electricity cost calculator
In this example, a computer monitor at 35W and 100% duty cycle costs $0.006 per scheduled hour. At 8.00 hours per day, that is $1.55 per 30.44 use days, using the August 2026 US average of 18.16¢/kWh. Adjust the calculator for your appliance and electricity bill.
Computer Monitor electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
102 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Running cost at different usage times
These examples hold 35W, 100% duty cycle and 18.16¢/kWh constant. They illustrate the arithmetic, not recommended schedules. Follow the manufacturer’s operating instructions.
| Hours per use day | kWh per day | Cost per day | 30.44 use days |
|---|---|---|---|
| 0.5 | 0.018 kWh | $0.00 | $0.10 |
| 1 | 0.035 kWh | $0.01 | $0.19 |
| 4 | 0.140 kWh | $0.03 | $0.77 |
| 8 | 0.280 kWh | $0.05 | $1.55 |
How to estimate your computer monitor electricity use
Monitor electricity use depends on the model and settings, including brightness and operating mode. A USB-C display can also supply power to a laptop or other devices, so decide which equipment your wattage includes.
This is display electricity cost. A laptop powered through the monitor should not be counted twice, and panel size alone does not establish wattage.
- Use on-mode input for your chosen settings or measure a representative period. Separate sleep or standby if not already included in a daily energy reading.
- A USB-C charging rating describes output available to a connected device, not constant extra consumption. A wall measurement of the monitor can include the power delivered to that device.
- For an illustrative steady 30W over eight hours, use is 0.24 kWh and cost is $0.048 at $0.20/kWh.
- For two monitors, add their inputs only when they operate for the same hours; otherwise calculate each schedule separately.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Electricity running cost by state
Sorted by average electricity price. These reference figures use 8.00 hours per day at 100% duty cycle, for 30.44 days per month and 365 days per year. Seasonal use will cost less than this year-round scenario. Click a state to load its rate.
| State | Rate /kWh | Per month | Per year | Relative |
|---|---|---|---|---|
| Nevada | 12.72¢ | $1.08 | $13.00 | |
| Louisiana | 12.87¢ | $1.10 | $13.15 | |
| Utah | 13.31¢ | $1.13 | $13.60 | |
| North Dakota | 13.31¢ | $1.13 | $13.60 | |
| Idaho | 13.37¢ | $1.14 | $13.66 | |
| Tennessee | 13.42¢ | $1.14 | $13.72 | |
| Nebraska | 13.54¢ | $1.15 | $13.84 | |
| Kentucky | 13.80¢ | $1.18 | $14.10 | |
| Arkansas | 14.37¢ | $1.22 | $14.69 | |
| Wyoming | 14.43¢ | $1.23 | $14.75 | |
| Mississippi | 14.43¢ | $1.23 | $14.75 | |
| Washington | 14.63¢ | $1.25 | $14.95 | |
| Oklahoma | 14.82¢ | $1.26 | $15.15 | |
| North Carolina | 14.95¢ | $1.27 | $15.28 | |
| Florida | 14.99¢ | $1.28 | $15.32 | |
| Arizona | 15.05¢ | $1.28 | $15.38 | |
| South Dakota | 15.15¢ | $1.29 | $15.48 | |
| Kansas | 15.47¢ | $1.32 | $15.81 | |
| Montana | 15.57¢ | $1.33 | $15.91 | |
| South Carolina | 15.76¢ | $1.34 | $16.11 | |
| Georgia | 15.90¢ | $1.36 | $16.25 | |
| Texas | 15.91¢ | $1.36 | $16.26 | |
| Oregon | 15.92¢ | $1.36 | $16.27 | |
| Missouri | 16.02¢ | $1.37 | $16.37 | |
| West Virginia | 16.31¢ | $1.39 | $16.67 | |
| Alabama | 16.33¢ | $1.39 | $16.69 | |
| New Mexico | 16.51¢ | $1.41 | $16.87 | |
| Indiana | 17.02¢ | $1.45 | $17.39 | |
| Iowa | 17.06¢ | $1.45 | $17.44 | |
| Colorado | 17.17¢ | $1.46 | $17.55 | |
| Minnesota | 17.20¢ | $1.47 | $17.58 | |
| Virginia | 17.64¢ | $1.50 | $18.03 | |
| Delaware | 18.70¢ | $1.59 | $19.11 | |
| Illinois | 19.32¢ | $1.65 | $19.75 | |
| Ohio | 19.38¢ | $1.65 | $19.81 | |
| Wisconsin | 19.41¢ | $1.65 | $19.84 | |
| Maryland | 21.40¢ | $1.82 | $21.87 | |
| Pennsylvania | 21.77¢ | $1.86 | $22.25 | |
| Michigan | 22.99¢ | $1.96 | $23.50 | |
| Vermont | 23.84¢ | $2.03 | $24.36 | |
| Connecticut | 24.51¢ | $2.09 | $25.05 | |
| New Jersey | 24.61¢ | $2.10 | $25.15 | |
| District of Columbia | 25.98¢ | $2.21 | $26.55 | |
| New Hampshire | 27.64¢ | $2.36 | $28.25 | |
| Rhode Island | 28.18¢ | $2.40 | $28.80 | |
| New York | 28.65¢ | $2.44 | $29.28 | |
| Alaska | 29.41¢ | $2.51 | $30.06 | |
| California | 29.75¢ | $2.54 | $30.40 | |
| Massachusetts | 30.48¢ | $2.60 | $31.15 | |
| Maine | 32.11¢ | $2.74 | $32.82 | |
| Hawaii | 47.18¢ | $4.02 | $48.22 |
Common questions
How much electricity does a computer monitor use?
In this example, 35 watts at a 100% duty cycle uses 0.035 kWh per scheduled hour. At 8.00 hours per day, that is 0.280 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a computer monitor for an hour?
The default example costs $0.006 per scheduled hour at the US average of 18.16¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
How much electricity do two monitors use?
Add their measured or specified operating watts if they share the same schedule, then multiply by hours. Use separate calculations if their runtimes differ.
Does monitor wall power include USB-C laptop charging?
It can. Check the measurement boundary. If the laptop receives its power through that monitor, the monitor wall reading already includes energy supplied downstream.
Should I include sleep-mode energy?
Include it for the hours spent asleep if it is not already included in an average full-day measurement. Do not apply viewing-mode watts to every plugged-in hour.