Best Wi-Fi channel: how to choose on 2.4 GHz, 5 GHz and 6 GHz

By The SpeedFibre team, updated . 3 min read.

Best Wi-Fi channel: how to choose on 2.4 GHz, 5 GHz and 6 GHz
In short On 2.4 GHz, use channel 1, 6 or 11 in 20 MHz width (in Europe, 1, 5, 9 and 13 also work). On 5 GHz, channels 36 to 48 are the safe choice; DFS channels (52 to 144) are often emptier but may switch after radar detection. On 6 GHz, interference is rare. Scan your neighbours first, then measure before and after.
Contents
  1. 2.4 GHz: only three channels that do not overlap
  2. 5 GHz: more room, and the DFS question
  3. 6 GHz: the quiet band
  4. Scan your neighbours before you choose
  5. Automatic or manual?
  6. Measure before and after

Your Wi-Fi shares the air with every network around you. In a block of flats, ten routers on the same channel take turns to speak, and each one gets a slice of the time. Moving to a quieter channel can double real speed and lower ping, at no cost.

2.4 GHz: only three channels that do not overlap

Each 2.4 GHz channel is 20 MHz wide but channels are only 5 MHz apart, so neighbours overlap. In North America, the only three channels that never overlap are 1, 6 and 11. Europe and many other regions allow channels up to 13, so 1, 5, 9 and 13 can also be used side by side.

  • Pick the one of these used by the fewest, weakest networks.
  • Avoid in-between channels such as 3 or 8: they collide with two channels at once.
  • Keep 20 MHz width: 40 MHz on 2.4 GHz overlaps almost everything.

5 GHz: more room, and the DFS question

ChannelsNamePoints to know
36 to 48Lower bandSupported by every device, no radar checks: the safe choice
52 to 144DFS channelsOften empty, but the router must listen for radar and may change channel
149 to 165Upper bandCommon in North America; restricted or unavailable in Europe

DFS (dynamic frequency selection) channels are shared with weather and military radar. The router listens before using them and moves away if a radar appears, which can cut Wi-Fi for a short time. If you see random drop-outs on a DFS channel, go back to 36 to 48.

Width: 80 MHz is the best balance in most homes. 160 MHz is faster near the router but uses more channels and suffers more from neighbours.

6 GHz: the quiet band

Wi-Fi 6E and Wi-Fi 7 devices can use 6 GHz, where few networks exist yet and channels do not overlap. Leave the router on automatic; range is shorter, so it suits the rooms close to the router. Europe opened the lower part of the band, North America the whole band. More in Wi-Fi 6 vs Wi-Fi 7.

Scan your neighbours before you choose

  • Android: a Wi-Fi analyser app shows every network and its channel on a graph.
  • Windows: run `netsh wlan show networks mode=bssid` to list nearby networks with their channel and signal.
  • macOS: hold Option, click the Wi-Fi icon, open Wireless Diagnostics, then Window and Scan.

Do the scan where you use Wi-Fi most, not next to the router.

Automatic or manual?

Most recent routers choose well on their own, and they adapt when neighbours change. Set a channel by hand only if the scan shows your router stuck on a crowded one, or if you suffer drop-outs on DFS. To change it, open the router's admin page.

Measure before and after

Run a speed test and a ping test in the same room before and after the change, at the same time of day. If nothing improves, the issue is distance or walls: see improve your home Wi-Fi and 2.4 GHz vs 5 GHz.

#WiFiDiagnosis#Ping#WiFi

Sources and further reading

Frequently asked questions

What is the best Wi-Fi channel for 2.4 GHz?

Channel 1, 6 or 11, whichever is least used around you, with a 20 MHz width. In Europe, 1, 5, 9 and 13 can also be used.

What is the best channel for 5 GHz?

Channels 36 to 48 work with every device and need no radar checks. DFS channels (52 to 144) are often quieter but may change if a radar is detected.

Does changing the channel increase speed?

Only if your current channel is crowded. In a busy building, it often helps a lot; in a detached house with no neighbours, it changes little.

The SpeedFibre team Guides written and reviewed by a telecom engineer specialised in fibre optics (FTTH), with more than 8 years of hands-on network maintenance and measurement. Editorial policy.

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