Mike and Key
Amateur Radio Club

Watts <> dBm <> Volts Converter


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



RF 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


voltage divider

Voltage Divider Resistance Calculator


Enter any of the three values and then click the Calculate button.

Vin = Input voltage
Vout =
Output voltage

Input voltageVin: V
Resistance Ra: Ω
Resistance Rb: Ω
Output voltageVout: V

K7LED

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