Wi-Fi Channel Planner

A Wi-Fi channel is a slice of spectrum, not a number on a dial. Each candidate is modelled as a block of spectrum centred on the channel number: 20 MHz wide in 5 and 6 GHz, and 22 MHz wide for every 2.4 GHz channel, because that is the width the original 802.11 mask occupies on a 5 MHz channel grid. A 40, 80 or 160 MHz channel is formed from contiguous 20 MHz channels and centred on them. Every neighbouring network you enter occupies its own block the same way, and the overlap is how many megahertz the two blocks share: a network on the same channel shares all of it, while one five 2.4 GHz channels away shares none. Congestion is that overlap as a share of your block, capped at 100 percent, so a single full-size neighbour already reads 100. The ranked list sorts by overlap, then by co-channel neighbours, then by channel number. The plan takes the quietest channel first and then the quietest one that shares no spectrum at all with those already chosen, so the channels you pick can run at the same time — which is why at most three 2.4 GHz radios fit side by side. Block boundaries follow the standard channelisation, so a 160 MHz channel cannot span the 20 MHz gap between channel 144 and channel 149. Not modelled: signal strength, walls and distance, antenna patterns, DFS radar rules, regional channel availability, 40 MHz use in 2.4 GHz, or the client's own capabilities. Radio regulations differ by country, so check that a channel is allowed where you are before you set it. Everything is worked out in your browser with no storage, uploads or network access.