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Wi Fi Channel Plan Calculator

Work out wi fi channel plan instantly with clear inputs, formula shown and shareable results.

About Wi Fi Channel Plan Calculator

Available channels are usable spectrum divided by channel width, so widening channels for peak speed directly reduces reuse options. The 2.4 GHz band offers only three non-overlapping 20 MHz channels regardless of settings; 5 GHz offers around 25 at 20 MHz with DFS enabled but only eight at 40 MHz without it, and 6 GHz transforms the picture with 1200 MHz.

Formula

Channel count

channels = usable spectrum / channel width; 2.4 GHz is fixed at 3 non-overlapping 20 MHz channels

Worked example

With the default values below, Wi Fi Channel Plan Calculator returns Non-overlapping channels available of 12. Change any input above and every figure here is recalculated in your browser.

Inputs used

Bandone of 2.4 GHz, 5 GHz, 6 GHz
5 GHz
Channel widthaccepts 20–320 MHz
40 MHz
Access points in the areaminimum 1
24
DFS channels usableone of Yes, No
Yes

Results

Non-overlapping channels available
12
Access points sharing each channel
2.0
Usable spectrum
500 MHz
Channel plan assessment
Comfortable channel reuse

Step by step

  1. 1Values used
  2. 2Channel count
  3. 3Non-overlapping channels available= 12
  4. 4Access points sharing each channel= 2.0
  5. 5Usable spectrum= 500 MHz
  6. 6Channel plan assessment= Comfortable channel reuse

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, 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

Should I use 80 MHz channels?

In high-density deployments no. Wider channels raise peak speed for one client but slash the channel count, so co-channel contention lowers aggregate capacity.

Why avoid DFS channels sometimes?

Radar detection forces an immediate channel change, which interrupts traffic. Some client devices also support DFS channels poorly.

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