The differences at a glance
The two bands trade range for speed:
| Feature | 2.4 GHz | 5 GHz |
|---|---|---|
| Range | Longer; better through walls | Shorter; weakened more by walls and floors |
| Typical real speed | Tens of Mbps, up to ~100–150 Mbps close by | Hundreds of Mbps close by |
| Non-overlapping channels | 3 (channels 1, 6, 11) | Many more, with wider channels |
| Interference | High: neighbours, Bluetooth, microwave ovens | Lower |
| Device support | Everything | Most phones and laptops from the last decade |
In short: 5 GHz for speed near the router, 2.4 GHz for reach and compatibility.
Why 2.4 GHz is slower
2.4 GHz has only about 80 MHz of spectrum, enough for three non-overlapping 20 MHz channels. In an apartment block or a dense neighbourhood, dozens of networks share those three channels and take turns to transmit, so everyone gets less airtime. Bluetooth devices and microwave ovens use the same frequencies too.
5 GHz has several times more spectrum, allowing wider 40, 80 or 160 MHz channels that carry more data, and there are fewer networks competing on each one.
Why 5 GHz has less range
Higher-frequency signals lose more strength passing through obstacles. Brick and concrete walls and floors, common in Pakistani homes, cut 5 GHz much more than 2.4 GHz. A room or two away, 5 GHz is usually still faster; at the far end of a house or on another floor, 2.4 GHz may be the only band that connects reliably.
If you need fast Wi-Fi far from the router, adding a mesh node or access point is better than falling back to 2.4 GHz. See router placement and how to improve Wi-Fi.
Which devices belong on which band
- 5 GHz: smart TVs and streaming boxes, laptops, phones and tablets, game consoles (if they can't be cabled), video-call devices.
- 2.4 GHz: smart plugs, bulbs and cameras (many only support 2.4 GHz), printers, devices at the edge of coverage.
- Cable: anything stationary that needs the best speed and latency, such as a gaming PC, console or TV next to the router (Ethernet vs Wi-Fi).
Getting the most from each band
- On 2.4 GHz, use channel 1, 6 or 11 and 20 MHz width. Wider channels on 2.4 GHz cause more interference than they gain.
- On 5 GHz, 80 MHz width is a good default. If some devices can't see the network, try channels 36–48, which avoid radar-detection (DFS) rules.
- Let the router pick channels automatically unless you've measured a problem; many routers re-check periodically.
- Test both bands in the same spot with the Wi-Fi speed test to see the difference in your home.
Common questions
Why can't my device see the 5 GHz network?
Either the device only supports 2.4 GHz (common for smart plugs, cameras and older phones), or the router is using a 5 GHz channel the device doesn't support. Setting the router to a non-DFS channel such as 36–48 often fixes the second case.
Should I use the same name for both bands?
It's convenient and lets the router steer devices between bands (band steering). If devices keep choosing 2.4 GHz when close to the router, give the bands different names and connect to 5 GHz manually.
Is 5 GHz Wi-Fi harmful?
No. Wi-Fi at both frequencies uses low-power, non-ionising radio waves, well within international exposure limits.
What about 6 GHz?
Wi-Fi 6E and Wi-Fi 7 can use a 6 GHz band with even more room and less interference, but shorter range. Both the router and device must support it, and availability depends on each country's regulations.