Which 2.4 GHz WiFi channels don't overlap?

Only channels 1, 6 and 11 are non-overlapping in the 2.4 GHz band (in North America). Every other channel partially overlaps its neighbours, so a well-designed network reuses just 1, 6 and 11 in a repeating pattern.

How many non-overlapping 5 GHz channels are there?

At 20 MHz width there are up to about 24 non-overlapping 5 GHz channels in North America (including DFS channels). Wider channels use them up fast: 40 MHz roughly halves the count, 80 MHz quarters it, and 160 MHz leaves only two.

Should I use 40 or 80 MHz channels on 2.4 GHz?

No. The 2.4 GHz band only has room for three non-overlapping 20 MHz channels, so a 40 MHz channel there guarantees interference. Keep 2.4 GHz at 20 MHz and save wide channels for 5 GHz and 6 GHz.

WiFi Channel Planner

Get a clean, non-overlapping channel plan for your access points — and a clear warning when you have more APs than channels and reuse becomes unavoidable.

Your deployment

Number of access points

Band

Channel width

Wider channels are faster but leave fewer non-overlapping options.

Include DFS channels? (5 GHz)

Channel plan

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non-overlapping channels available → —

Access points to assign—

Each channel reused—

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Suggested assignment

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Why channel planning matters

Two access points on the same channel within earshot of each other don't add capacity — they take turns, halving each other's airtime. Worse, two APs on overlapping channels (say 1 and 3 on 2.4 GHz) interfere as raw noise, which is worse than sharing. Good design assigns non-overlapping channels so neighbouring APs never collide, reusing each channel only where cells are far enough apart not to hear each other.

The rules that never change

2.4 GHz: only 1, 6 and 11. Three channels, forever. Never use 40 MHz here.
5 GHz: go wide carefully. 80 MHz channels are fast but you only get a handful — in a dense deployment, 40 MHz or even 20 MHz gives you more channels to reuse cleanly.
6 GHz is the escape hatch. WiFi 6E/7 opens far more spectrum, so wide channels stop being a scarcity problem — if your APs and clients support it.

Frequently asked questions

Which 2.4 GHz channels don't overlap?

Only 1, 6 and 11 in North America. Everything else overlaps.

How many non-overlapping 5 GHz channels?

Up to ~24 at 20 MHz (with DFS). 40 MHz halves it, 80 MHz quarters it, 160 MHz leaves two.

40 MHz on 2.4 GHz?

Never — there's only room for three 20 MHz channels. 40 MHz guarantees interference. Keep 2.4 at 20 MHz.

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