This calculator determines the thermal noise power (Pn) in dBm based on system temperature and bandwidth. It helps quantify the unavoidable background noise present in electronic communication systems.
Formula
Pn = 10 * log10( (k * B * T) / (1 mW) )
Formula Explanation
- k = 1.38064852 × 10⁻²³ (Boltzmann constant)
- B = Bandwidth in Hz
- T = Temperature in Kelvin (K)
- 1 mW = 1 × 10⁻³ W (used for conversion to dBm)
Example
Input: T = 290 K, B = 1 MHz
Result: Pn ≈ -114 dBm
Who uses it
Helpful for RF and communication engineers to estimate system noise levels and receiver sensitivity.