How many watts does a gaming PC use?
A gaming PC uses 300–700 W (about 450 W on average). Running 4 hours/day, that is about 1.80 kWh a day and 54.0 kWh a month — roughly $9.89 a month at the U.S. average rate of 18.31 ¢/kWh.
This is the gaming PC electricity usage reference: watts, amps on a 120 V circuit, the kWh math, and links to what that usage costs in each state.
Watts, amps, and kWh for a gaming PC
| Measure | Value |
|---|---|
| Rated wattage range | 300–700 W |
| Average draw used in our math | 450 W |
| Amps at 120 V | 2.5–5.8 A (3.8 A at the average draw) |
| kWh per hour | 0.45 kWh |
| kWh per day at 4 hours/day | 1.80 kWh |
| kWh per month | 54.0 kWh |
| Cost per month at the U.S. average (18.31 ¢/kWh) | $9.89 |
The math is kWh = watts × hours ÷ 1000 and amps = watts ÷ volts. A standard 120 V household circuit on a 15 A breaker carries about 1,800 W. For the dollars in your state, open cost to run a gaming PC in Texas and switch states from there.
Gaming PC electricity usage profile
| Metric | Value |
|---|---|
| kWh per hour | 0.45 kWh |
| kWh per day (typical) | 1.80 kWh |
| kWh per month (typical) | 54.0 kWh |
| kWh per year (typical) | 657.0 kWh |
| Low runtime scenario | 2 hours/day |
| High runtime scenario | 6 hours/day |
Connect usage to cost tools
Related appliance usage pages
Source & Method
Source: U.S. Energy Information Administration (EIA) Retail Sales of Electricity. Last dataset period: July 2026. Usage calculations use fixed appliance wattage and runtime assumptions so results stay comparable across pages.
Frequently asked questions
How many watts does a gaming PC use?
A gaming PC uses 300–700 W (about 450 W on average). Our usage and cost math uses 450 watts running 4 hours/day.
How many amps does a gaming PC draw?
On a 120 V circuit, 300–700 W works out to about 2.5–5.8 A; at the 450 W we use in the math that is 3.8 A.
How much electricity does a gaming PC use per month?
About 54.0 kWh a month at 4 hours/day. Lighter use (2 hours/day) comes to roughly 27.0 kWh and heavier use (6 hours/day) roughly 81.0 kWh.
How much does it cost to run a gaming PC?
About $9.89 a month at the U.S. average rate of 18.31 ¢/kWh — from roughly $6.87 in Louisiana to $25.92 in Hawaii at the same usage. The state cost-to-run pages price it at every state's rate.