Modulation Calculator

Find the AM modulation index.

Modulation index 0.6

Modulation depth (%) 60

Formula: m = message amplitude ÷ carrier amplitude

Step-by-step with your numbers:

1. Values used:

2. Message amplitude = 3 V

3. Carrier amplitude = 5 V

5. Modulation index = Message amplitude / Carrier amplitude = 3 / 5 = 0.6

6. Modulation depth = 60%

Did we solve your problem today?

The modulation index sets how strongly a message signal varies an AM carrier.

The math behind it

m = message amplitude ÷ carrier amplitude. Keep m ≤ 1 (100%) to avoid distortion (overmodulation).

3 V message on a 5 V carrier → m = 0.6 (60%).

What is overmodulation?

m > 1, which clips the signal and creates distortion and interference.