The internet is full of complex, detailed and confusing information about Wi-Fi, very often mixing together the ETSI regulations with the FCC/US ones and it is really not easy to understand fully the implications of choosing one channel instead of another.
2.4 GHz is relatively easy, once you know that channels may overlap and that at the end of the day the only "good" configuration is using channels 1, 6 and 11.
5 GHz is a nightmare, already with 20 MHz wide channels due to DFS, CAC, TPC and what not.
When you go for wider channels, 40, 80 and 160 MHz, the probabilities of making a "wrong" choice multiply.
I wasn't able to find a complete and easily understandable table of channels so I made one, actually 4 of them, one each for 20/40/80/160 Mhz wide channels.
Here we use ETSI, our good friends across the pond (as well as those in other countries with different regulations) may well take the .xls and adapt it to their local situation.
I am attaching the spreadsheet as a .xls (inside a .zip) and as a .pdf as a 4 page A3 pdf print, together with (relatively poor) .png images, so that they are immediately visible.
As always ideas, corrections, proposal for additions are welcome.
wifi_channels.zip (21.9 KB)
wifi_channels.pdf (44.0 KB)
EDIT:
- 25/07/2026 Fixed first 80 MHz 5 GHz channel (was wrongly #38, now it is correct #42)
- 28/07/2026 Fixed max power of 5GHz high channels to 14 dBm (was 13)