Noise Factor to Noise Figure Calculator

Noise Factor is the measure of degradation of the signal to noise ratio in a device. This is an online Noise Factor to Noise Figure converter. Enter the Noise Factor to calculate the equivalent Noise Figure. It is the ratio of the Signal to Noise Ratio at the input to the Signal to Noise Ratio at the output. Since the signal to noise ratio at the output will always be lower than the Signal to Noise ratio at the input, the Noise Factor is always less than 1. A Lower Noise Factor results in better performance of a device. The Noise Figure is noise factor expressed in decibels (dB). Click here to learn more

Enter the value of Noise Factor to calculate Noise Figure.


  • Noise Figure

What is the noise factor to noise figure calculator?

The noise factor to noise figure calculator is an online calculator used to convert noise factor into equivalent noise figure (in dB). 

What do Noise factor and noise figure (NF) mean?

Noise factor and Noise figure (NF) are the measures of degradation of the signal-to-noise ratio (SNR) as the signal pass through a device or circuit (for example, an amplifier). SNR (Signal-to-noise ratio) is a ratio of signal power level to the noise power level. The SNR ratio of more than 1:1 (greater than 0 dB) indicates more signal power than noise power. The degradation of SNR occurs due to the external noise and internal noise (caused by the device(s) as the signal passes through). 

The noise figure & noise factor is just a number by which the performance of an amplifier, mixer, radio receiver, or circuits/devices can be specified.  A lower value of noise factor & noise figure indicates a device (e.g., amplifier, mixer, etc) performance is better. Usually, the noise figure data of the device is given in the specification datasheet. 

Noise factor (F) means the ratio of the signal-to-noise ratio at the input (SNRi) to the signal-to-noise ratio at the output (SNRo) of a device/circuit. When a device is present in a circuit, it introduces noises in the passing signal, so the SNRo at the output of the device is always lower than SNRi at the input of the device; this indicates that the noise factor is always greater than one. The expression for the noise factor is given below.

The Noise figure (NF) is nothing but the decibel of the Noise factor; i.e., NF is the logarithmic value of the noise factor. The formula for converting noise factor (F) into noise figure (NF) is given below.

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