Amplifier & Receiver
Thermal Noise Power Calculator
Calculate the thermal noise floor of a system from its bandwidth and ambient temperature.
Result
Enter the inputs above and select Calculate.
Formula: P_n = k · T · B · P_n(dBm) = 10 · log₁₀(k · T · B × 1000)
At 290 K the noise density is −173.98 dBm/Hz, the −174 dBm/Hz used as shorthand everywhere.