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FM Modulation Index

Calculate FM Modulation Index instantly with the exact formula and a worked example.

FM Modulation Index

Δf, Hz
f_m, Hz
β (modulation index)
5
β = Δf/f_mCalculate FM Modulation Index instantly with the exact formula and a worked example.
β
5

More about: FM Modulation Index

What it calculates

The “FM Modulation Index” calculator computes β (modulation index) from 2 parameters: δf, hz, f_m, hz.

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Δf, Hz = 75,000, f_m, Hz = 15,000 the result is 5 (β = Δf/f_m).

How to use

  1. Enter δf, hz and f_m, hz — each field above is adjustable with a slider.
  2. β (modulation index) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is FM Modulation Index calculated?
The FM Modulation Index calculator computes β (modulation index) from δf, hz, f_m, hz. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the FM Modulation Index calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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