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dBm Milliwatts, Watts & Voltage Conversion Chart

 dBm Milliwatts, Watts & Voltage Conversion Chart

When working with RF power, it is often useful to know the voltage level for a given power.

The table below provides a chart to convert between dBm, watts and voltage - peak to peak in a 50Ω system.

Although voltage levels are unlikely to rise to significant levels which might cause damage for power levels measured in dBm, the voltages are often used in other calculations.

Three tables have been included. These have been chosen because the voltages move from readings measured in millivolts to those in volts. Also as the milliwatts change to watts, the change in the table is made.

DBm / millivolts / milliWatts conversion table

This conversion table charts the values for dBm against milliwatts and the relevant voltage expressed in millivolts.

It is applicable to many lower power applications.

dBmmilliWattsVoltage
millivolts (p-p)
Voltage
millivolts (RMS)
-300.0010207.1
-280.001625.28.9
-260.002531.711.2
-240.004040.014.2
-220.006350.217.8
-200.01063.222.4
-180.01679.628.2
-160.02510035.5
-140.04012644.7
-120.06315956.4
-100.10020071.0
-80.1625289.4
-60.25317112
-40.40399142
-20.63502178
01.00632224
21.58796282
42.5140001420

DBm - milliwatts - Volts conversion table:-

This conversion table charts the values for dBm against milliwatts and the relevant voltage expressed in volts.

It is applicable to many medium power applications.

dBmmilliWattsVoltage
Volts (p-p)
Voltage
Volts (RMS)
01.000.6320.224
21.580.796282
42.514.001.42
63.981.260.45
86.311.590.56
10102.000.71
1215.82.520.89
1425.13.171.12
1639.83.991.41
1863.15.021.78
201006.322.24
221587.952.82
2425.110.03.55
2639812.64.48
2863115.95.64
30100020.07.10
32158525.28.94
34251031.711.2

DBm - Watts - Volts conversion table

This conversion table charts the values for dBm against milliwatts and the relevant voltage expressed in volts.

It is applicable to many high power applications.

dBmWattsVoltage
mV (p-p)
Voltage
mV (RMS)
301.00207.10
321.5825.28.94
342.5131.711.3
363.9840.014.1
386.3150.217.8
4010.063.222.4
4215.979.628.2
4425.110035.5
4639.812644.7
4863.115956.4
5010020071.0
5215925289.4
54251317112
56398399142
58631502178
601000632224
621585796282

These tables of dBm, dBW, watts and miliwatts to volts are useful to discover the voltages present. Converting from dBm and from the other values of dBW and watts to voltage, both peak to peak and RMS can be useful in many areas of RF design.


Watch the video: Wireless Power: dBm, mW and dBW (September 2021).