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Wi-Fi Channel Calculator

Networking
Recommended non-overlapping channels: 1, 6, 11
ChannelCenter (MHz)Occupied RangeStatusInspect

1

recommended
2412 MHz2401–2423 MHz

2

2417 MHz2406–2428 MHz

3

2422 MHz2411–2433 MHz

4

2427 MHz2416–2438 MHz

5

2432 MHz2421–2443 MHz

6

recommended
2437 MHz2426–2448 MHz

7

2442 MHz2431–2453 MHz

8

2447 MHz2436–2458 MHz

9

2452 MHz2441–2463 MHz

10

2457 MHz2446–2468 MHz

11

recommended
2462 MHz2451–2473 MHz

About This Tool

Wi-Fi Channel Calculator – 2.4 GHz and 5 GHz Band Guide

Choosing the right Wi-Fi channel is one of the highest-impact, lowest-cost improvements you can make to a wireless network. Overlapping channels cause co-channel interference, throttling throughput even when signal strength is excellent. This calculator shows every channel in the 2.4 GHz and 5 GHz bands — including center frequencies, occupied spectrum, DFS status, and channel bonding groups — so you can select the configuration that minimises interference for your deployment.

Understanding the 2.4 GHz Band

The 2.4 GHz ISM band spans roughly 2400–2500 MHz and is divided into up to 14 channels depending on region. Each channel is nominally 20 MHz wide but occupies approximately 22 MHz of spectrum (±11 MHz around the center frequency under 802.11b/g/n spectral mask rules). Because the total band is only 100 MHz, channels overlap heavily.

The standard solution is to use only channels 1, 6, and 11— these are separated by 25 MHz, enough to prevent spectrum overlap when using 20 MHz channels. In the United States and Canada the regulatory maximum is channel 11; Europe allows up to channel 13, enabling an alternative three-channel plan of 1, 5, 9, and 13 (four non-overlapping channels); Japan permits channel 14 for legacy 802.11b networks only.

Identifying Interference on 2.4 GHz

Two 2.4 GHz channels interfere when their center frequencies are fewer than 20 MHz apart — that is, fewer than four channel numbers apart. Selecting channel 6 in the inspector highlights channels 2 through 10 as interferers. Microwave ovens, baby monitors, Bluetooth, and Zigbee devices also occupy the 2.4 GHz band, adding non-Wi-Fi interference that cannot be avoided by channel selection alone. Where possible, migrating clients to 5 GHz eliminates most 2.4 GHz congestion.

The 5 GHz Band and Channel Bonding

The 5 GHz band offers substantially more spectrum, typically 500–700 MHz of usable bandwidth across the U-NII-1, U-NII-2A, U-NII-2C, and U-NII-3 sub-bands. Each sub-band occupies a distinct frequency range:

  • U-NII-1 (5150–5250 MHz) — channels 36–48: indoor, low power, no DFS required. Best first choice for devices near the access point.
  • U-NII-2A (5250–5350 MHz) — channels 52–64: DFS required. Radar avoidance means the AP may switch channels without warning, but interference from other Wi-Fi networks is typically very low.
  • U-NII-2C (5470–5730 MHz) — channels 100–144: DFS required, highest density of channels in the band. Suitable for enterprise deployments where DFS support is guaranteed.
  • U-NII-3 (5725–5850 MHz) — channels 149–165: outdoor, higher power limit, no DFS. Commonly used by consumer routers and outdoor bridges. Channels 149, 153, 157, and 161 are the most widely supported.

Channel Width and Throughput Trade-offs

802.11n introduced 40 MHz bonding, 802.11ac added 80 and 160 MHz, and Wi-Fi 6/6E (802.11ax) extends this to 320 MHz on 6 GHz. Wider channels increase raw throughput but reduce the number of non-overlapping channels available:

  • 20 MHz: up to 25 non-overlapping channels across the full 5 GHz band; lowest throughput per channel.
  • 40 MHz: approximately 12–13 non-overlapping channels; doubles the theoretical throughput of 20 MHz.
  • 80 MHz: 6 non-overlapping channels; the sweet spot for most home and small-office networks on 5 GHz.
  • 160 MHz: only 2–3 non-overlapping channels across the entire 5 GHz band; reserved for very low-density environments or dedicated links.

Dynamic Frequency Selection (DFS)

DFS is a regulatory mechanism that requires Wi-Fi devices to detect weather radar and maritime/military radar signals before and during transmission on channels 52–144. When radar is detected, the AP must vacate the channel within 10 seconds and may not use it again for at least 30 minutes. Modern enterprise access points handle this transparently, but some consumer-grade routers implement DFS poorly, causing frequent channel changes. Always verify DFS support before deploying on channels above 48.

Practical Channel Selection Tips

Before choosing a channel, survey the local RF environment using a Wi-Fi scanner to see which channels neighbours are using. On 2.4 GHz, pick whichever of channels 1, 6, or 11 has the least competing traffic. On 5 GHz, U-NII-1 (channels 36–48) and U-NII-3 (149–165) are the safest choice if your equipment does not support DFS; adding U-NII-2C with DFS enabled dramatically increases available spectrum for multi-AP or enterprise deployments.

Frequently Asked Questions

Is the Wi-Fi Channel Calculator free?

Yes, Wi-Fi Channel Calculator is totally free :)

Can I use the Wi-Fi Channel Calculator offline?

Yes, you can install the webapp as PWA.

Is it safe to use Wi-Fi Channel Calculator?

Yes, any data related to Wi-Fi Channel Calculator only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

How does the Wi-Fi Channel Calculator work?

Select a band (2.4 GHz or 5 GHz) and a channel width. For 2.4 GHz the tool shows all 13 channels with their center frequencies, occupied spectrum, and which channels interfere with each other. For 5 GHz it groups the primary 20 MHz channels into valid 20/40/80/160 MHz bonded blocks, highlighting DFS channels that require radar detection.

Why should I use non-overlapping channels on 2.4 GHz?

The 2.4 GHz band is only 100 MHz wide, so adjacent channel interference is a major source of throughput degradation. Using channels 1, 6, and 11 ensures at least 25 MHz of separation between networks, eliminating co-channel and adjacent-channel interference in a typical three-AP deployment.

What is a DFS channel and should I use it?

Dynamic Frequency Selection (DFS) channels (52–144) must scan for weather radar before transmitting and immediately vacate if radar is detected. The upside is that far fewer consumer devices use DFS channels, so interference is minimal. If your router and client devices both support DFS and you are not near an airport or weather station, DFS channels are often the best choice on 5 GHz.

What does channel bonding mean for 5 GHz?

Channel bonding combines multiple 20 MHz channels into a single wider channel — 40, 80, or 160 MHz — to increase throughput. A 160 MHz channel can theoretically deliver over twice the speed of an 80 MHz channel, but it also occupies more spectrum, leaving fewer non-overlapping channels available for nearby networks. In dense deployments, narrower channels often deliver better real-world performance.

Which 5 GHz channels are available in the United States?

The FCC permits channels 36–64 (U-NII-1 and U-NII-2A), 100–144 (U-NII-2C), and 149–165 (U-NII-3). Channels 52–144 are DFS channels. Some ISP-provided routers restrict channels to 36–48 and 149–165 (non-DFS only) for simplicity, missing out on significant additional spectrum.

How many non-overlapping 80 MHz channels exist on 5 GHz?

There are approximately 6 non-overlapping 80 MHz channels in the full 5 GHz band: 36–48, 52–64, 100–112, 116–128, 132–144, and 149–161. The exact availability depends on your region; U-NII-2C channels (100–144) require DFS support. For 160 MHz only two or three non-overlapping channels exist across the entire band.