Signal-to-Noise Ratio (SNR) Calculator

Your details

Power SNR uses 10 log10; voltage/amplitude uses 20 log10 because power is proportional to amplitude squared.
Power of the desired signal (any consistent unit: watts, milliwatts, etc.).
Power of the background noise in the same unit as the signal power.
SNRGood SNR
20dB

Signal-to-noise ratio in decibels

SNR ratio100
Amplitude ratio10
Noise as % of signal10%
20 dB
Very poor<5Poor5-10Marginal10-20Good20-30Very good30-40Excellent40+

SNR is 20.00 dB - acceptable signal quality.

  • An SNR of 20-30 dB is good. This range covers acceptable Wi-Fi, telephone audio, and most imaging sensors.
  • The signal carries 100.00 times as much power as the noise (power ratio = 100.00:1).
  • Noise amplitude represents 10.0% of the signal amplitude.

Next stepYour SNR is in a healthy range. If you need even lower noise, try bandwidth reduction, signal averaging, or differential measurement techniques.

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