Noise figure to noise floor
Type a value in dB to get it in dBm/Hz instantly.
-173dBm/Hz
That's about the same as a satellite receiver. That is an equivalent noise temperature of about 75.09 K.
What it means
How quiet is that receiver?
Everything here is referred to 290 K, the standard reference temperature. A receiver pointed at cold sky sees far less noise than one pointed at the ground.
The math
How to convert dB to dBm/Hz
Noise figure and temperature are two readings of the same thing: T = 290 × (10^(NF ÷ 10) − 1), and back again NF = 10 × log₁₀(1 + T ÷ 290).
Example: 1 dB = -173 dBm/Hz.
Every unit
Your noise in every unit
Tables
dB to dBm/Hz conversion table
| dB | dBm/Hz |
|---|---|
| 0.1 dB | -173.9 dBm/Hz |
| 0.3 dB | -173.7 dBm/Hz |
| 0.5 dB | -173.5 dBm/Hz |
| 1 dB | -173 dBm/Hz |
| 1.5 dB | -172.5 dBm/Hz |
| 2 dB | -172 dBm/Hz |
| 3 dB | -171 dBm/Hz |
| 5 dB | -169 dBm/Hz |
| 7 dB | -167 dBm/Hz |
| 10 dB | -164 dBm/Hz |
| 15 dB | -159 dBm/Hz |
dBm/Hz to dB conversion table
| dBm/Hz | dB |
|---|---|
| -174 dBm/Hz | 0 dB |
| -173 dBm/Hz | 1 dB |
| -172 dBm/Hz | 2 dB |
| -171 dBm/Hz | 3 dB |
| -169 dBm/Hz | 5 dB |
| -167 dBm/Hz | 7 dB |
| -164 dBm/Hz | 10 dB |
| -159 dBm/Hz | 15 dB |
Quick answers
Quick answers
- How many dBm/Hz is 1 dB?
- 1 dB is -173 dBm/Hz.
- How many dBm/Hz is 10 dB?
- 10 dB is -164 dBm/Hz.
The units
About these units
Noise figure (dB)
How many decibels of signal-to-noise the stage costs you.
Noise floor (dBm/Hz)
The noise power in a one-hertz bandwidth: −174 dBm plus the figure.
Keep going