Use 5 GHz as your everyday band, 2.4 GHz for devices far from the router or devices that support nothing else, and 6 GHz for Wi-Fi 6E and Wi-Fi 7 devices that are close to the router. That rule of thumb follows from one trade-off: the lower the frequency, the further the signal reaches; the higher the band, the more room it has for wide, fast channels.
The rest of this guide explains why, shows how much spectrum each band really has, and covers the problems people actually run into: crowded 2.4 GHz, 5 GHz channels that change, 6 GHz that a device cannot see, and smart-home gadgets that refuse to join.
The three bands side by side
| 2.4 GHz | 5 GHz | 6 GHz | |
|---|---|---|---|
| Spectrum (US) | 2400–2483.5 MHz | Several sub-bands, 5150–5895 MHz | 5925–7125 MHz (1,200 MHz) |
| Typical channels | Three 20 MHz channels | Up to six 80 MHz channels, some needing DFS | 14 × 80 MHz or 7 × 160 MHz; 320 MHz with Wi-Fi 7 |
| Range | Longest; best through walls | Shorter than 2.4 GHz | Shortest of the three |
| Crowding | Busiest; most older devices use it | Less crowded | Least; older Wi-Fi generations cannot use it |
| Which devices | Wi-Fi 4, Wi-Fi 6 and later (Wi-Fi 5 itself is 5 GHz only) | Wi-Fi 5 and later; Wi-Fi 4 only if dual-band | Wi-Fi 6E and Wi-Fi 7 only |
| Rules worth knowing | — | Radar detection (DFS) on part of the band | WPA3 required; availability varies by country |
Each row is explained below. A given device may support fewer bands than its generation allows, so check its specifications; Wi-Fi standards explained lists the bands each generation uses.
- Radar detection (DFS) required
The chart above draws each band to the same scale using US rules. The 6 GHz band alone is wider than the other two combined, which is why it can hold so many wide channels. Other countries allocate different amounts, especially in 6 GHz.
Why 2.4 GHz reaches further
Lower-frequency signals travel further, and 2.4 GHz has the longest range and the best ability to pass through walls of the three bands. That makes it the band most likely to still work in the far bedroom, the garden or the garage.
How much further depends on your building: wall materials, floors and where the router sits matter more than any general figure. This guide does not quote distances, because there is no single number that holds across homes.
Why 2.4 GHz is crowded
2.4 GHz has been in use the longest, so most older devices still use it, and that crowds the band. It is also narrow: 83.5 MHz in the US, and devices are typically limited to three 20 MHz channels. In an apartment building, your neighbours’ routers are competing for those same few channels.
5 GHz: the everyday band, and what DFS means
In the US, 5 GHz Wi-Fi is not one block but several sub-bands between 5.15 and 5.895 GHz, with a gap between 5.35 and 5.47 GHz. Intel counts up to six 80 MHz channels in the band, and notes that four of them may be restricted at times because of weather or airport radar.
Those restrictions come from dynamic frequency selection (DFS). Devices that use 5.25–5.35 GHz or 5.47–5.725 GHz must detect radar and avoid operating on the same channel as a radar system.
For most homes 5 GHz is the best balance: more room and less crowding than 2.4 GHz, more reach than 6 GHz, and supported by every Wi-Fi 5, 6, 6E and 7 device.
6 GHz: lots of room, shorter reach
The FCC opened 1,200 MHz between 5.925 and 7.125 GHz in April 2020. Indoor low-power devices can use all of it; standard-power devices can use 850 MHz of it under an automated frequency coordination system that protects existing licensed users. The Wi-Fi Alliance counts 14 new 80 MHz channels and seven new 160 MHz channels in the band, and it is the only band with Wi-Fi 7’s 320 MHz channels. Juniper’s documentation puts the number of non-overlapping 320 MHz channels at three in the US and one in Europe.
Four things to know before you rely on it:
- Only Wi-Fi 6E and Wi-Fi 7 devices can use it. A Wi-Fi 6 phone, however new, will not see a 6 GHz network.
- It always uses WPA3. WPA3 is mandatory in the 6 GHz band.
- It depends on where you live. 6 GHz Wi-Fi is available only where regulators allow it, and Juniper notes that 320 MHz channels may be unavailable in some regions.
- There is less competition. The Wi-Fi Alliance describes 6 GHz as clear spectrum with less interference from older Wi-Fi 4 and Wi-Fi 5 devices. Less is not none: the Wi-Fi 6E and Wi-Fi 7 devices in your home and your neighbours’ homes share it.
Indoor 6 GHz access points also run under tight power limits. US rules cap an indoor 6 GHz access point at 5 dBm e.i.r.p. per megahertz (30 dBm in total), while an indoor access point in the 5.15–5.25 GHz part of 5 GHz may use up to 17 dBm per megahertz of conducted power, before any antenna gain.
Which band for which device
This is Router Academy’s guidance, based on the trade-offs above. Your router may make these choices automatically (see the next section).
| Device or situation | Best band | Why |
|---|---|---|
| Wi-Fi 6E or Wi-Fi 7 laptop, phone or headset near the router | 6 GHz | Most room, least crowding |
| Most phones, laptops, TVs and consoles | 5 GHz | Fast, less crowded, reasonable reach |
| Devices at the far edge of your coverage | 2.4 GHz (or add coverage) | Longest range; but it is the slowest and busiest band |
| Smart plugs, cameras and other smart-home gadgets | Usually 2.4 GHz | Many support nothing else |
| Older laptops and tablets | 5 GHz if listed, else 2.4 GHz | Check the device’s Wi-Fi specifications |
The smart-home row is common in practice: TP-Link, for example, says most of its Tapo cameras support only 2.4 GHz.
If you keep needing 2.4 GHz just to stay connected at the edge of your home, the better fix is usually more coverage, not a slower band. Wi-Fi dead zones helps you find the cause, and Mesh Wi-Fi vs router vs extender compares the ways to add coverage. If devices keep dropping their connection, see Wi-Fi keeps disconnecting.
One network name or separate names?
Many routers can put every band under one network name and decide for each device which band it uses. This is widely known as band steering; TP-Link calls it Smart Connect. TP-Link’s version gives 2.4 GHz and 5 GHz the same name and password and assigns each device to the band that offers the fastest speed. It does not always go smoothly: TP-Link notes that some smart-home devices have trouble connecting when both bands share one name, and suggests turning Smart Connect off to separate the bands.
Which generations support which bands, and why 6 GHz needs Wi-Fi 6E or later, is covered in Wi-Fi standards explained. For Wi-Fi 7’s ability to use more than one band at once, see Wi-Fi 7 explained.