Conversion Table/Decibels-Volts-Watts DECIBELS - VOLTS - WATTS CONVERSION TABLE FOR A 50-OHM SYSTEM dBm V Po dBm V Po dBm mV Po dBm V Po +53 100.0 200 W 0 .225 1.0 mW -49 0.80 -98 2.9 +50 70.7 100 W -1 .200 .80 mW -50 0.71 .01 uW -99 2.51 +49 64.0 80 W -2 .180 .64 mW -51 0.64 -100 2.25 1 pW +48 58.0 64 W -3 .160 .50 mW -52 0.57 -101 2.0 +47 50.0 50 W -4 .141 .40 mW -53 0.50 -102 1.8 +46 44.5 40 W -5 .125 .32 mW -54 0.45 -103 1.6 +45 40.0 32 W -6 .115 .25 mW -55 0.40 -104 1.41 +44 32.5 25 W -7 .100 .20 mW -56 0.351 -105 1.27 +43 32.0 20 W -8 .090 .16 mW -57 0.32 -106 1.18 +42 28.0 16 W -9 .080 .125 mW -58 0.286 +41 26.2 12.5 W -10 .071 .10 mW -59 0.251 dBm nV +40 22.5 10 W -11 .064 -60 0.225 .001 nW -107 1000 +39 20.0 8 W -12 .058 -61 0.200 -108 900 +38 18.0 6.4 W -13 .050 -62 0.180 -109 800 +37 16.0 5 W -14 .045 -63 0.160 -110 710 .01 pW +36 14.1 4 W -15 .040 -64 0.141 -111 640 +35 12.5 3.2 W -16 .0355 -112 580 +34 11.5 2.5 W dBm uV -113 500 +33 10.0 2 W dBm mV -65 128 -114 450 +32 9.0 1.6 W -17 31.5 -66 115 -115 400 +31 8.0 1.25 W -18 28.5 -67 100 -116 355 +30 7.10 1.0 W -19 25.1 -68 90 -117 825 +29 6.40 800 mW -20 22.5 .01 mW -69 80 -118 285 +28 5.80 640 mW -21 20.0 -70 71 .1 nW -119 251 +27 5.00 500 mW -22 17.9 -71 65 -120 225 .001 pW +26 4.45 400 mW -23 15.9 -72 58 -121 200 +25 4.00 320 mW -24 14.1 -73 50 -122 180 +24 3.55 250 mW -25 12.8 -74 45 -123 160 +23 3.20 200 mW -26 11.5 -75 40 -124 141 +22 2.80 160 mW -27 10.0 -76 35 -125 128 +21 2.52 125 mW -28 8.9 -77 32 -126 117 +20 2.25 100 mW -29 8.0 -78 29 -127 100 +19 2.00 80 mW -30 7.1 .001 mW -79 25 -128 90 +18 1.80 64 mW -31 6.25 -80 22.5 .01 nW -129 80 .1 fW +17 1.60 50 mW -32 5.8 -81 20.0 -130 71 +16 1.41 40 mW -33 5.0 -82 18.0 -131 61 +15 1.25 32 mW -34 4.5 -83 16.0 -132 58 +14 1.15 25 mW -35 4.0 -84 11.1 -133 50 +13 1.00 20 mW -36 3.5 -85 12.9 -134 45 +12 .90 16 mW -37 3.2 -86 11.5 -135 40 +11 .80 12.5 mW -38 2.85 -87 10.0 -136 35 +10 .71 10 mW -39 2.5 -88 9.0 -137 33 +9 .64 8 mW -40 2.25 .1 W -89 8.0 -138 29 +8 .58 6.4 mW -41 2.0 -90 7.1 .001 nW -139 25 +7 .500 5 mW -42 1.8 -91 6.1 -140 23 .01 fW +6 .445 4 mW -43 1.6 -92 5.75 +5 .400 3.2 mW -44 1.4 -93 5.0 +4 .355 2.5 mW -45 1.25 -94 4.5 +3 .320 2.0 mW -46 1.18 -95 4.0 +2 .280 1.6 mW -47 1.00 -96 3.51 +1 .252 1.25 mW -48 0.90 -97 3.2