Thermal Noise Power Calculator

What is the thermal noise power?

Thermal noise (also called Nyquist noise or Johnson noise) is the electronic noise generated in an electrical conductor by the thermal agitation of electrons The random motion of electrons constitutes a random current in the conductor, and the magnitude of the electron's random motion is proportional to the conductors’ temperature. The magnitude of the thermal noise is measured in terms of its average power Pave (called thermal noise power).  Usually, the thermal noise power is measured in dBm. 

Thermal noise is the function of the ambient temperature of the conductor and bandwidth of the frequency (included in the measurement). 

How is thermal noise power calculated?

The following formula is used to calculate the thermal noise power.

Where,

T = Temperature in Kelvin/C

B = Bandwidth in Hz/KHz/MHz/GHz

K= Boltzmann constant = 1.38064852 × 10-23 m2 kg s-2 K-1