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dBm & Voltage Conversion Table
- conversion table to convert between dBm, Watts and voltage in a 50 ohm system.
Decibels pages include:
• Decibel & formula
• Decibel table / chart
• Watts / dBm / dBW conversion table
• dBm / Watts / voltage conversion table
• Decibel calculator
• Nepers & neper to dB conversion
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.
| dBm | milliWatts | Voltage millivolts (p-p) |
Voltage millivolts (RMS) |
|---|---|---|---|
| -30 | 0.0010 | 20 | 7.1 |
| -28 | 0.0016 | 25.2 | 8.9 |
| -26 | 0.0025 | 31.7 | 11.2 |
| -24 | 0.0040 | 40.0 | 14.2 |
| -22 | 0.0063 | 50.2 | 17.8 |
| -20 | 0.010 | 63.2 | 22.4 |
| -18 | 0.016 | 79.6 | 28.2 |
| -16 | 0.025 | 100 | 35.5 |
| -14 | 0.040 | 126 | 44.7 |
| -12 | 0.063 | 159 | 56.4 |
| -10 | 0.100 | 200 | 71.0 |
| -8 | 0.16 | 252 | 89.4 |
| -6 | 0.25 | 317 | 112 |
| -4 | 0.40 | 399 | 142 |
| -2 | 0.63 | 502 | 178 |
| 0 | 1.00 | 632 | 224 |
| 2 | 1.58 | 796 | 282 |
| 4 | 2.51 | 4000 | 1420 |
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.
| dBm | milliWatts | Voltage Volts (p-p) |
Voltage Volts (RMS) |
|---|---|---|---|
| 0 | 1.00 | 0.632 | 0.224 |
| 2 | 1.58 | 0.796 | 282 |
| 4 | 2.51 | 4.00 | 1.42 |
| 6 | 3.98 | 1.26 | 0.45 |
| 8 | 6.31 | 1.59 | 0.56 |
| 10 | 10 | 2.00 | 0.71 |
| 12 | 15.8 | 2.52 | 0.89 |
| 14 | 25.1 | 3.17 | 1.12 |
| 16 | 39.8 | 3.99 | 1.41 |
| 18 | 63.1 | 5.02 | 1.78 |
| 20 | 100 | 6.32 | 2.24 |
| 22 | 158 | 7.95 | 2.82 |
| 24 | 25.1 | 10.0 | 3.55 |
| 26 | 398 | 12.6 | 4.48 |
| 28 | 631 | 15.9 | 5.64 |
| 30 | 1000 | 20.0 | 7.10 |
| 32 | 1585 | 25.2 | 8.94 |
| 34 | 2510 | 31.7 | 11.2 |
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.
| dBm | Watts | Voltage mV (p-p) |
Voltage mV (RMS) |
|---|---|---|---|
| 30 | 1.00 | 20 | 7.10 |
| 32 | 1.58 | 25.2 | 8.94 |
| 34 | 2.51 | 31.7 | 11.3 |
| 36 | 3.98 | 40.0 | 14.1 |
| 38 | 6.31 | 50.2 | 17.8 |
| 40 | 10.0 | 63.2 | 22.4 |
| 42 | 15.9 | 79.6 | 28.2 |
| 44 | 25.1 | 100 | 35.5 |
| 46 | 39.8 | 126 | 44.7 |
| 48 | 63.1 | 159 | 56.4 |
| 50 | 100 | 200 | 71.0 |
| 52 | 159 | 252 | 89.4 |
| 54 | 251 | 317 | 112 |
| 56 | 398 | 399 | 142 |
| 58 | 631 | 502 | 178 |
| 60 | 1000 | 632 | 224 |
| 62 | 1585 | 796 | 282 |
Other popular reference pages & tables . . . . . |
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| • dBm / Watts table | • Trig functions | • Fourier series | • Constants |
| • SI base units | • SI prefixes | • Sidereal time | • Greek letters |
| • Resistivity | • Physical constants | • Capacitance | • Circuit symbols |