How much does a gaming PC cost per month in Maryland?

About $10.42 a month, assuming 400 W, 4 hours a day, 365 days a year at 21.41¢/kWh.

How many kilowatt-hours does a gaming PC use?

Roughly 584 kWh a year under these assumptions, or 0.40 kWh for every hour it runs.

Is that expensive compared with other states?

Maryland has the 15th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $107 a year.

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Cost to run a gaming PC in Maryland (July 2026 rates)

At 21.41¢ per kilowatt-hour — Maryland's average residential price in July 2026 — running a gaming PC costs $125 a year. That is 17% more than the national average of $107. Maryland's residential rate is up 13.7% from July 2025, which moves this appliance from $110 to $125 a year.

Per hour: 8.6¢
Per day of use: 34.3¢
Per month: $10.42
Per year: $125

Assumption: 400 W, 4 hours a day, 365 days a year — 584 kWh a year. Under load with a mid-to-high-end GPU. Idling at the desktop is closer to 80 W, and the monitor is on top of this. Use the calculator to swap in the numbers from your own model.

How Maryland compares

Maryland pays 21.41¢/kWh, the 15th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $18.10 more a year than the typical U.S. household pays for the same use. Running the same gaming PC costs $74.28 a year in Louisiana and $280 in Hawaii, so where you live changes this bill by $206 a year.

State	Rate	Per month	Per year
Illinois	19.22¢	$9.35	$112
Ohio	19.45¢	$9.47	$114
Maryland	21.41¢	$10.42	$125
Pennsylvania	21.72¢	$10.57	$127
Michigan	23.05¢	$11.22	$135

States ranked by average residential price, cheapest first. See all 51 states for a gaming PC.

What else costs about the same in Maryland

Aquarium$127 a year in MD Well pump$117 a year in MD Dehumidifier$116 a year in MD

Cutting the number down

Capping frame rate to the monitor's refresh rate cuts GPU draw substantially with no visible difference.
Sleep rather than idle: a machine left at the desktop overnight can use more in a year than the gaming itself.
Undervolting a modern GPU typically trims power meaningfully at near-identical performance.

Questions

How much does a gaming PC cost per month in Maryland?: About $10.42 a month, assuming 400 W, 4 hours a day, 365 days a year at 21.41¢/kWh.
How many kilowatt-hours does a gaming PC use?: Roughly 584 kWh a year under these assumptions, or 0.40 kWh for every hour it runs.
Is that expensive compared with other states?: Maryland has the 15th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $107 a year.