Wi-Fi router vs. modem: running cost
A modem is cheaper to run: about $13 a year versus $16 for a Wi-Fi router at typical use and 17.99¢/kWh, a $3 difference.
| Wi-Fi router | Modem | |
|---|---|---|
| Typical watts | 10 W | 8 W |
| Watt range | 5–25 W | 4–15 W |
| Typical use | 24 hours a day | 24 hours a day |
| Energy per year | 88 kWh | 70 kWh |
| Cost per hour | 0.2¢ | 0.1¢ |
| Cost per day | 4.3¢ | 3.5¢ |
| Cost per month | $1.31 | $1.05 |
| Cost per year | $16 | $13 |
| Per year in Hawaii (43.51¢) | $38 | $31 |
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What drives the difference
- Wi-Fi router: Routers run 24/7 and draw 6-20 W, about 50-175 kWh a year.
- Modem: Cable modems and fiber ONTs draw 5-12 W continuously, about 70 kWh a year.
Ways to cut either cost
Modem-router combo
Replaces two always-on devices with one.
See options on Amazon Modem-router combo
One box draws less than a separate modem and router.
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, a Wi-Fi router or a modem?
At typical use and the U.S. average rate (17.99¢/kWh), a Wi-Fi router costs about $16 a year versus $13 for a modem. That's $3 more, or 1.3× as much.
How many watts do Wi-Fi router and modem use?
A Wi-Fi router typically draws 10 W (range 5–25 W). A modem draws 8 W (range 4–15 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.