Zigbee channel next to your Wi-Fi
Zigbee and Wi-Fi share the same 2.4 GHz band. Pick the channel your router is on and you'll see straight away which Zigbee channel is quietest. Zigbee already running? Flip it round and move your Wi-Fi instead of re-pairing every device.
Neighbours' Wi-Fi (optional)
A Wi-Fi analyser app shows which channels the networks around you use. They count for less than your own router.
The 2.4 GHz band
The curves are how far each Wi-Fi network spreads its energy. The dots show how much of it lands on each Zigbee channel — lower is quieter. Tap a channel for details.
Calculated in your browser — nothing is stored or sent.
How it works
1. Pick your router's channel
It's in your router's admin page under 2.4 GHz Wi-Fi. On auto? Choose 'not sure'.
2. Read the advice
The best Zigbee channel appears right beside it, with how much Wi-Fi energy still reaches it. Adding neighbours is optional.
3. Apply it
Copy the line for Zigbee2MQTT, or change the channel in ZHA. Zigbee already running? Move your Wi-Fi instead.
No rules of thumb — actual arithmetic: we lay the IEEE 802.15.4 channel plan (Zigbee, 2 MHz per channel) against the 802.11 transmit mask (Wi-Fi, 20 or 40 MHz wide, with sloping skirts) and work out how much Wi-Fi energy still lands on each Zigbee channel. On a tie, the tool picks the channel that also stays clear if Wi-Fi later appears on 1, 6 or 11 — so you don't have to re-pair everything twice. Connecting Zigbee to MQTT? Read how to connect Zigbee to MQTT. Curious what your smart devices cost in electricity? Try the energy cost calculator. No Zigbee network yet? Our Zigbee2MQTT guide walks through setting one up. Wi-Fi itself the weak spot? The Wi-Fi coverage planner works out how many access points your home needs. And if you would rather have the whole thing set up and tuned for you, that is our smart home installation service.
Frequently asked questions
Why do Wi-Fi and Zigbee interfere?
They share the same 2.4 GHz band. A Wi-Fi channel is about 20 MHz wide; a Zigbee channel is only 2 MHz. If your Zigbee channel sits inside an active Wi-Fi channel, the router is transmitting straight over it. Zigbee devices use very little power, so they lose that fight — the result is a sensor going 'unavailable' or a light that responds slowly.
Why do 15, 20 and 25 usually come out on top?
Almost every router runs on Wi-Fi channel 1, 6 or 11, because those don't overlap each other. That leaves narrow 5 MHz gaps between them, and Zigbee 15, 20 and 25 land exactly in those gaps, with 1 MHz of air on either side — which is the most the band plan physically allows. If your neighbours use other channels the answer shifts, and that's what this tool works out for you.
Can't I just use channel 26? It looks the clearest.
On paper, yes — in practice, no. Channels 25 and 26 sit at the top of the band where the permitted transmit power is lower, and many devices and coordinators support them poorly or not at all. You end up with a clean channel, short range and devices that refuse to pair. That's why this tool deliberately ranks them lower and flags them as 'limited device support'.
My Zigbee network is already running. Do I have to re-pair everything?
Usually not: move the Wi-Fi instead of Zigbee. Choose 'My Zigbee channel is fixed' at the top, enter your current Zigbee channel (Zigbee2MQTT starts on 11 by default), and the tool tells you which Wi-Fi channel to put your router on. That takes a minute, and your devices won't notice.
My router is set to 'auto'. What do I choose?
Choose 'not sure'. Routers on auto almost always pick 1, 6 or 11, and the advice then accounts for all three. Better still: fix your router to one channel, or it may drift later onto one that hits your Zigbee. If the width is 'auto' or '20/40 MHz', choose 40 MHz: a wide Wi-Fi channel swallows almost half the band.
How do I change the Zigbee channel?
In your coordinator: Zigbee2MQTT uses the channel setting in configuration.yaml; ZHA has it under the radio settings. Be aware that on most setups you'll have to re-pair all your devices afterwards, because they keep following the old channel. So it's best to get it right when you first set the network up.
What if no channel comes out clear?
In a busy apartment block the spectrum really can be full. Then it helps more to move the Wi-Fi devices that can handle it over to 5 GHz, add extra Zigbee routers (mains-powered devices) to strengthen the mesh, or move the coordinator away from your router and any USB 3.0 ports using an extension cable — those are a notorious source of interference in their own right.
Is my data stored?
No. The calculation runs entirely in your own browser. Nothing is stored or sent.
Prefer a network that just works?
We set up Home Assistant, Zigbee and Matter for you — locally controlled, no subscription, and with a channel plan that adds up.