Most home Wi‑Fi routers use about 5 to 20 watts, while mesh systems and router+modem setups often land around 10 to 40 watts total depending on how many nodes you run.
For full system planning, use the WattSizing Calculator.
Quick Answer
Most standalone routers draw roughly 5–20 W. If you also run a cable/DSL modem, a mesh node, or a PoE switch, the always-on total is often closer to 15–60 W.
Detailed Explanation
Routers are a classic “small but constant” load. The wattage is modest, but it runs 24/7, so the daily and monthly energy can be meaningful—especially off-grid or on battery backup.
What drives router watt usage:
- Wi‑Fi generation and radios: tri-band and Wi‑Fi 6E/7 gear can draw more than basic dual-band.
- Mesh node count: each node is essentially another router running nonstop.
- USB devices and features: USB storage, parental control scanning, and heavy traffic can nudge power up.
- Extra network gear: modem, switch, access points, or PoE injectors often matter more than the router itself.
If you’re totaling your “always-on” baseline, you may also want How Many Watts Does a Television Use (for evening loads) and How Many Watts Does a Desktop Computer Use (if it’s left running).
Watt Table
| Networking Device | Typical Running Watts | Typical Starting Watts |
|---|---|---|
| Basic Wi‑Fi router (dual-band) | 5 - 12 W | 6 - 15 W |
| High-performance router (tri-band / Wi‑Fi 6E/7) | 10 - 20 W | 12 - 25 W |
| Mesh node (each additional node) | 6 - 15 W | 7 - 18 W |
| Cable/DSL modem | 6 - 18 W | 7 - 22 W |
| Small unmanaged switch (5–8 port) | 2 - 10 W | 3 - 12 W |
Calculation Example
Example: A router averages 12 W and runs all day.
- kWh/day = (12 Ă— 24) / 1000 = 0.288 kWh/day
- At $0.16/kWh, that’s about $0.05/day
- Monthly cost (30 days) is about $1.38
If you also have a modem at 10 W and one mesh node at 9 W, the total becomes (12 + 10 + 9 = 31 W), or 0.744 kWh/day. Use the WattSizing Calculator to roll this into your full daily budget.
Tips to Reduce Power Usage
- If you don’t need mesh, a single well-placed router can cut always-on watts.
- Turn off unused features (extra guest networks, USB sharing) if your model allows it.
- For power backup, consider placing the modem/router on a small UPS so you don’t have to oversize the whole system for a relatively small continuous load.
FAQs
Does a router have a startup surge?
Not typically. Startup power is usually close to its running draw compared to motor loads.
Why does my mesh system use more power than expected?
Each mesh node draws power continuously. Add a modem and switch and the “network stack” can become a noticeable baseline load.
Is it worth measuring router watts?
Yes if you’re sizing a battery/UPS or trying to reduce 24/7 loads. A small difference in watts matters when it runs nonstop.
CTA
Want to know your true 24/7 baseline (router, modem, standby devices, and more)? Use the WattSizing Calculator to total always-on watts and estimate daily kWh.
