iMac / all-in-one computer vs. desktop computer: running cost
An iMac / all-in-one computer is cheaper to run: about $25 a year versus $38 for a desktop computer at typical use and 17.99¢/kWh, a $13 difference.
| iMac / all-in-one computer | Desktop computer | |
|---|---|---|
| Typical watts | 60 W | 90 W |
| Watt range | 30–180 W | 40–250 W |
| Typical use | 6 hours a day | 6 hours a day |
| Energy per year | 138 kWh | 210 kWh |
| Cost per hour | 1.1¢ | 1.6¢ |
| Cost per day | 6.8¢ | 10¢ |
| Cost per month | $2.07 | $3.15 |
| Cost per year | $25 | $38 |
| Per year in Hawaii (43.51¢) | $60 | $92 |
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What drives the difference
- iMac / all-in-one computer: All-in-ones combine computer and display; Apple-silicon iMacs draw about 30-60 W in normal use, older 27-inch Intel iMacs 100-180 W.
- Desktop computer: A typical desktop tower without a discrete gaming GPU draws 50-120 W in use; sleep mode draws 1-3 W. Monitor not included.
Ways to cut either cost
Uses 5-15 W for similar work if you already own an efficient monitor.
See options on AmazonSmall PCs do office work at 10-25 W instead of 60-120 W.
See options on AmazonWe may earn a commission from qualifying purchases. It never changes the numbers we show. Disclosure.
Frequently asked questions
Which costs more to run, an iMac / all-in-one computer or a desktop computer?
At typical use and the U.S. average rate (17.99¢/kWh), a desktop computer costs about $38 a year versus $25 for an iMac / all-in-one computer. That's $13 more, or 1.5× as much.
How many watts do iMac / all-in-one computer and desktop computer use?
An iMac / all-in-one computer typically draws 60 W (range 30–180 W). A desktop computer draws 90 W (range 40–250 W). Watts alone don't decide cost. Hours of use, cycling and standby matter just as much.
Rates: EIA, 12 months ending 2026-07. Methodology.