basic

Signal-to-Noise Ratio (SNR) from Signal and Noise Power Calculator

SNR = 10·log₁₀(P_s/P_n) — quality of a signal.

Calculates SNR = 10·log₁₀(P_signal/P_noise) in dB, and SNDR if distortion power is known. SNR > 40 dB is considered high-quality for audio; >90 dB for hi-fi.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

W
W

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

SNR = 10·log₁₀(P_s/P_n)

In depth

Calculates SNR = 10·log₁₀(P_signal/P_noise) in dB, and SNDR if distortion power is known. SNR > 40 dB is considered high-quality for audio; >90 dB for hi-fi.