Signal-to-Noise Ratio(dB)

The Signal-to-Noise Ratio (SNR) calculator computes a relative measure of the strength of the received signal (i.e., the information being transmitted) compared to the noise. 

INSTRUCTIONS: Enter the following.

• (S)  Signal strength
• (N) Noise Level

Signal to Noise Ratio (SNR): The calculator returns the SNR in dB.

The Math / Science

When signals are a measure of amplitude, in measures such as volts (V) or amperes (A), the formula for Signal to Noise Ratio is: 

     SNR = 20 * log₁₀(S/N)

where:

• SNR = Signal to Noise Ratio
• S = Signal Strength
• N= Noise Level

NOTE: The units of signal strength and noise are the same.  This means that the formula works for any units, as long as they are the same when entered into the formula.  

The SNR is typically measured in units of decibels (dB), a unit of measure that some think is used by electrical engineers primarily to confuse computer scientists. The SNR, measured in dB, is twenty times the ratio of the base-10 logarithm of the amplitude of the received signal to the amplitude of the noise.

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