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ADC SNR Calculator

Enter the effective number of bits to get the ideal SNR.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The ideal signal-to-noise ratio of an analog-to-digital converter is set entirely by its resolution, expressed through the classic formula SNR = 6.02 × ENOB + 1.76 dB, where ENOB is the effective number of bits. The 6.02 dB-per-bit factor comes from the fact that each additional bit halves the quantization step size, and the 1.76 dB constant falls out of assuming a full-scale sine-wave input and uniformly distributed quantization error.

Electronics and DSP engineers use this relationship both ways: to predict the theoretical best-case SNR a given ADC bit-depth can deliver, and to back-calculate a real-world ADC's effective number of bits from its measured SNR on a datasheet — a standard step when comparing ADC parts or validating audio and instrumentation designs against the manufacturer's specs.

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