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Conversion Table - Volts to DBm

Volts
rms
Volts
peak-to-peak
dBm
Z=50 ohms
dBm
Z=75 ohms
dBm
Z=600 ohms
0.0000001 Vrms 0.0000003 Vpp -127.0 dBm -128.8 dBm -137.8 dBm
0.0000003 Vrms 0.0000008 Vpp -117.4 dBm -119.2 dBm -128.2 dBm
0.0000005 Vrms 0.0000014 Vpp -113.0 dBm -114.8 dBm -123.8 dBm
0.0000010 Vrms 0.0000028 Vpp -107.0 dBm -108.8 dBm -117.8 dBm
0.0000020 Vrms 0.0000057 Vpp -101.0 dBm -102.7 dBm -111.8 dBm
0.0000030 Vrms 0.0000085 Vpp -97.4 dBm -99.2 dBm -108.2 dBm
0.0000050 Vrms 0.0000141 Vpp -93.0 dBm -94.8 dBm -103.8 dBm
0.0000100 Vrms 0.0000283 Vpp -87.0 dBm -88.8 dBm -97.8 dBm
0.0001000 Vrms 0.0002828 Vpp -67.0 dBm -68.8 dBm -77.8 dBm
0.0004 Vrms 0.001 Vpp -56.0 dBm -57.8 dBm -66.8 dBm
0.0010 Vrms 0.003 Vpp -47.0 dBm -48.8 dBm -57.8 dBm
0.004 Vrms 0.010 Vpp -36.0 dBm -37.8 dBm -46.8 dBm
0.007 Vrms 0.020 Vpp -30.0 dBm -31.8 dBm -40.8 dBm
0.018 Vrms 0.050 Vpp -22.0 dBm -23.8 dBm -32.8 dBm
0.022 Vrms 0.063 Vpp -20.0 dBm -21.8 dBm -30.8 dBm
0.028 Vrms 0.080 Vpp -18.0 dBm -19.7 dBm -28.8 dBm
0.035 Vrms 0.100 Vpp -16.0 dBm -17.8 dBm -26.8 dBm
0.044 Vrms 0.125 Vpp -14.1 dBm -15.8 dBm -24.9 dBm
0.053 Vrms 0.150 Vpp -12.5 dBm -14.3 dBm -23.3 dBm
0.062 Vrms 0.175 Vpp -11.2 dBm -12.9 dBm -22.0 dBm
0.071 Vrms 0.200 Vpp -10.0 dBm -11.8 dBm -20.8 dBm
0.080 Vrms 0.225 Vpp -9.0 dBm -10.7 dBm -19.8 dBm
0.088 Vrms 0.250 Vpp -8.1 dBm -9.8 dBm -18.9 dBm
0.101 Vrms 0.286 Vpp -6.9 dBm -8.7 dBm -17.7 dBm
0.152 Vrms 0.429 Vpp -3.4 dBm -5.1 dBm -14.2 dBm
0.224 Vrms 0.632 Vpp 0.0 dBm -1.8 dBm -10.8 dBm
0.253 Vrms 0.714 Vpp 1.1 dBm -0.7 dBm -9.7 dBm
0.274 Vrms 0.775 Vpp 1.8 dBm 0.0 dBm -9.0 dBm
0.354 Vrms 1.000 Vpp 4.0 dBm 2.2 dBm -6.8 dBm
0.775 Vrms 2.191 Vpp 10.8 dBm 9.0 dBm 0.0 dBm
1.228 Vrms 3.472 Vpp 14.8 dBm 13.0 dBm 4.0 dBm
1.946 Vrms 5.503 Vpp 18.8 dBm 17.0 dBm 8.0 dBm
3.084 Vrms 8.722 Vpp 22.8 dBm 21.0 dBm 12.0 dBm
4.887 Vrms 13.824 Vpp 26.8 dBm 25.0 dBm 16.0 dBm
7.746 Vrms 21.909 Vpp 30.8 dBm 29.0 dBm 20.0 dBm
12.277 Vrms 34.723 Vpp 34.8 dBm 33.0 dBm 24.0 dBm

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Volts_rms=Volts_peak_to_peak/SQRT(8)

Volts_peak_to_peak=Volts_rms*SQRT(8)

dBm=20*LOG10(Volts_peak_to_peak/SQRT(0.008*Z))

dBmv=20*LOG10(Volts_rms/0.001)