How much does a computer monitor cost to run in California?
$13 a month
- A day of use
- $0.42
- An hour of running
- $0.05
- A year
- $152.16
150 W, 8 hours a day, at California’s average rate of 34.7¢ per kWh (EIA, June 2026). How we calculate this
Change the watts, hours or rate
What it costs at other usage levels
| Use | A day | A month | A year |
|---|---|---|---|
| 1 hour a day | $0.05 | $1.59 | $19.02 |
| 2 hours a day | $0.10 | $3.17 | $38.04 |
| 4 hours a day | $0.21 | $6.34 | $76.08 |
| 8 hours a day typical | $0.42 | $12.68 | $152.16 |
| 24 hours a day | $1.25 | $38.04 | $456.48 |
A typical model draws about 150 W (Virginia Cooperative Extension).
California compared with other states
California’s residential rate is the 2nd most expensive of 51 states and DC, 16.4¢ above the US average of 18.3¢ (+89%). California’s rate is up 1.2¢ from June 2025 (33.6¢, +3.4%).
Ways to spend less
- Lower the brightness; it is the main driver of a monitor's power use.
- Let it sleep after a few minutes idle.
- Switch it off at the button at night rather than leaving it on standby.
Questions
How much does it cost to run a computer monitor per hour?
About $0.05 an hour in California. A computer monitor at 150 W uses 0.150 kWh per hour, and at California’s average of 34.7¢ per kWh that comes to $0.05.
How much does a computer monitor add to your electric bill?
Used 8 hours a day, about $12.68 a month in California, or $152.16 a year.
How much does it cost to run a computer monitor 24 hours a day?
Running nonstop, a computer monitor would use 3.60 kWh a day and cost $1.25 a day, or $38.04 over an average month in California.
How many watts does a computer monitor use?
A typical model draws about 150 W (Virginia Cooperative Extension). Check the label on yours: cost scales directly with watts, so a 20% lower wattage means a 20% lower bill.
Why does a computer monitor cost more or less to run in California than elsewhere?
California’s residential rate is the 2nd most expensive of 51 states and DC, 16.4¢ above the US average of 18.3¢ (+89%). California’s rate is up 1.2¢ from June 2025 (33.6¢, +3.4%). The appliance uses the same energy everywhere; only the price per kWh changes.
Sources
- Virginia Cooperative Extension: Estimating appliance and home electronic energy use (reproduces U.S. Department of Energy sample wattages)
- Penn State EGEE 102: Typical range of power consumption (wattage)
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: average price of electricity to ultimate customers, residential, June 2026 Figures transcribed from republications of this table on September 26, 2026; pending direct verification from the EIA API.
- Carrier page: June 2026 residential average price, citing EIA Electric Power Monthly Table 5.6.A
Usage assumptions (hours a day, season) are ours and listed on the methodology page. Found an error? Tell us.