Watts <> dBm <> Volts Converter

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This calculator converts between watts, dBm, volts and dBmV.

Select the Impedance then enter any one of the other parameters below and the rest will be calculated automatically

Impedance (Ω):  50ΩCommon in RF and Microwave Systems
75ΩCommon in TV and Video Systems
600ΩCommon in Audio Systems
Custom Value
 
milli Watts (mW):
Watts (W):
 
dBm:
dBW:
 
VRMS:
VPeak: Assuming a sine wave
VP-P: Assuming a sine wave
 
dBmV: dB relative to 1mV RMS. Often used in the cable TV industry and only valid in 75Ω systems



Most RF engineers will have memorised the following values:

dBmmWNotes
  0   1Exact by definition of dBm
  3   23 dBm is actually 1.995 mW but that's near enough for most practical purposes
 10  10Exact
 +3  X 2Adding 3 to the power in dBm is the same as multiplying the power in Watts by two (actually 1.995 but that's near enough for most practical purposes)
+10 X 10Adding 10 the the power in dBm is exactly the same as multiplying the power in Watts by 10



Whilst I try to keep the information on this site accurate, I'm only human and I do occasionally make mistakes. I therefore advise you to check any information before using it for anything important. If you do find any errors, please let me know so that I can correct them.

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This page was last changed on: 17 September 2017.

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