Signal-To-Noise Ratio Calculator

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Calculate the Signal-to-Noise Ratio (SNR) in decibels or linear ratio.

Input Parameters

Input Mode

Signal Power (Ps)

Noise Power (Pn)

Calculation Results

Enter parameters to calculate

About this calculator

Quick Reference

Ps / AsSignal Level

Pn / AnNoise Level

dBDecibels

Overview

Signal-to-noise ratio (SNR) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.

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Pro Tips

SNR is usually expressed in decibels (dB).
A higher SNR means the signal is clearer and more distinct from the noise.
If calculating via power, use SNR = 10 * log10(Ps/Pn).
If calculating via amplitude (like voltage), use SNR = 20 * log10(As/An).

Fun Facts

"An SNR of 0 dB means the signal and noise levels are exactly equal."
"CD players typically have an SNR of over 90 dB."
"In deep space communication, NASA uses advanced coding to recover signals that are actually below the noise level (negative SNR)."

Formula: SNR(dB) = 10 * log10(Ps / Pn)