WiFi Channel Calculator
Find non-overlapping WiFi channels and center frequencies for 2.4GHz and 5GHz bands.
About WiFi Channel Calculator
In the 2.4 GHz band, each 20 MHz-wide channel is spaced only 5 MHz apart in center frequency, so adjacent channels overlap significantly; only channels 1, 6, and 11 are spaced far enough apart (20 MHz or more) to avoid overlapping entirely, which is why they are the standard recommendation. The 5 GHz band has far more spectrum divided into channels that are inherently non-overlapping at 20 MHz width, giving many more usable channels — though some (52-144) are subject to Dynamic Frequency Selection (DFS) rules to avoid interfering with radar systems.
Formula
2.4GHz channel overlap condition
Channels overlap if |channel_A − channel_B| × 5 MHz < 20 MHz (i.e. separated by fewer than 4 channel numbers)
Worked example
With the default values below, WiFi Channel Calculator returns Interference Risk of Low — channel 1, 6, or 11 selected (standard non-overlapping set). Change any input above and every figure here is recalculated in your browser.
Inputs used
- Frequency Bandone of 2.4 GHz, 5 GHz
- 2.4 GHz
- Selected Channelaccepts 1–165
- 6
Results
- Interference Risk
- Low — channel 1, 6, or 11 selected (standard non-overlapping set)
- Overlapping Channels
- 3, 4, 5, 7, 8, 9
- Non-Overlapping Channel Set
- 1, 6, 11
- Total Non-Overlapping Channels Available
- 3
Step by step
- 1Values used
- 22.4GHz channel overlap condition
- 3Interference Risk= Low — channel 1, 6, or 11 selected (standard non-overlapping set)
- 4Overlapping Channels= 3, 4, 5, 7, 8, 9
- 5Non-Overlapping Channel Set= 1, 6, 11
- 6Total Non-Overlapping Channels Available= 3
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or fees or charges into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
Why are only channels 1, 6, and 11 recommended on 2.4GHz?
Each 2.4GHz channel is 20 MHz wide but channels are numbered only 5 MHz apart, so adjacent channel numbers overlap heavily. Channels 1, 6, and 11 are the only three spaced at least 20 MHz apart from each other, making them the only fully non-overlapping combination.
Why does 5GHz have so many more usable channels?
The 5GHz band has much more total spectrum allocated to WiFi, and it's divided into 20 MHz segments that don't overlap by design, unlike 2.4GHz's tightly packed channel numbering — giving 20+ independent channels instead of just 3.
What is DFS and why does it matter for some 5GHz channels?
Dynamic Frequency Selection (DFS) channels (roughly 52-144) share spectrum with weather and military radar. Devices using these channels must detect radar signals and vacate the channel within seconds if radar is present, which can occasionally cause brief disconnects.
Does using a non-standard 2.4GHz channel always cause problems?
It increases interference risk with neighboring networks on overlapping channels, degrading throughput for both networks, but won't necessarily prevent connectivity — the practical impact depends on how many other networks are nearby and how congested the band already is.