How Much Does It Cost to Run a Desktop PC?

About 1 kWh a day at 120 W, or 29 kWh a month, which is around $5 at the national average rate. Add $2 to $4 for a monitor over the same hours.

At 60 W idle, 24 hours is 1.4 kWh, around 43 kWh a month. Letting it sleep when unused cuts that to roughly a third.

Yes, usually a third to a half. A laptop is built to run on a battery, so its parts are chosen for low draw. For email, browsing and office work there is no performance reason to prefer a tower.

A typical office desktop draws about 120 W during normal use and 50 to 70 W when idle with the screen on. Small form factor and mini PCs with laptop-class processors use 15 to 40 W. The monitor is separate, usually 15 to 50 W.

About 2 cents an hour. At 120 W, one hour is 0.12 kWh, and 0.12 kWh x $0.173 is 2.1 cents at the national average rate. A 25 W monitor adds about half a cent.

About $60 a year at 8 hours a day. That is 120 W x 8 hours = 0.96 kWh a day, or about 350 kWh a year, and 350 kWh x $0.173 is about $61. Leaving it idling around the clock instead of sleeping can roughly double that.

No. At 8 hours a day an office desktop uses about 29 kWh a month, a few percent of what an average U.S. home uses according to EIA. A computer that never sleeps and the monitors beside it are where the cost adds up.

Yes, easily. A 120 W desktop plus a 25 W monitor is about 145 W, so a 1,000 Wh power station runs it for roughly 6 hours after inverter losses (1,000 Wh x 0.85 / 145 W). A small UPS only gives minutes, enough to save work and shut down.

Yes, by about three quarters for office work. A mini PC at about 30 W for 8 hours uses 0.24 kWh a day, about $1.25 a month at 17.3 cents. A 120 W tower over the same hours uses 0.96 kWh a day, about $5 a month.

Set the PC to sleep after 20 to 30 minutes idle and the monitor to turn off after 10. Use the balanced or power-saver power plan instead of high performance. For email, browsing and office work, a laptop or mini PC does the job at a fraction of the draw.