Microwave notions (a few notes)
dBm, volts and watts conversion table:
dBm to Volts(rms) to Watts – Conversion Table (50 Ohms)
dBm
V
Po
mV
uV
+53
100.0
200W
0
.225
1.0 mW
-49
0.80
-98
2.9
+50
70.7
100W
-1
.200
.80 mW
-50
0.71
.01 uW
-99
2.51
+49
64.0
80W
-2
.180
.64 mW
-51
0.64
-100
2.25
.1 pW
+48
58.0
64W
-3
.160
.50 mW
-52
0.57
-101
2.0
+47
50.0
50W
-4
.141
.40 mW
-53
0.50
-102
1.8
+46
44.5
40W
-5
.125
.32 mW
-54
0.45
-103
1.6
+45
40.0
32W
-6
.115
.25 mW
-55
0.40
-104
1.41
+44
32.5
25W
-7
.100
.20 mW
-56
0.351
-105
1.27
+43
32.0
20W
-8
.090
.16 mW
-57
0.32
-106
1.18
+42
28.0
16W
-9
.080
.125 mW
-58
0.286
+41
26.2
12.5W
-10
.071
.10 mW
-59
0.251
nV
+40
22.5
10W
-11
.064
-60
0.225
.001 uW
-107
1000
+39
20.0
8W
-12
.058
-61
0.200
-108
900
+38
18.0
6.4W
-13
.050
-62
0.180
-109
800
+37
16.0
5W
-14
.045
-63
0.160
-110
710
.01 pW
+36
14.1
4W
-64
0.141
640
+35
12.5
3.2W
-16
.0355
-112
580
+34
11.5
2.5W
-113
500
+33
10.0
2W
-65
128
-114
450
+32
9.0
1.6W
-17
31.5
-66
115
-115
400
+31
8.0
1.25W
-18
28.5
-67
100
-116
355
+30
7.10
1.0W
-19
25.1
-68
90
-117
316
+29
6.40
800mW
-20
.01 mW
-69
80
-118
285
+28
5.80
640mW
-21
-70
71
.1nW
-119
251
+27
5.00
500mW
-22
17.9
-71
65
-120
225
.001 pW
+26
4.45
400mW
-23
15.9
-72
58
-121
200
+25
4.00
320mW
-24
-73
50
-122
180
+24
3.55
250mW
-25
12.8
-74
45
-123
160
+23
3.20
200mW
-26
-75
40
-124
141
+22
2.80
160mW
-27
-76
35
-125
+21
2.52
125mW
-28
8.9
-77
32
-126
117
+20
100mW
-29
-78
29
-127
+19
2.00
80 mW
-30
7.1
.001mW
-79
25
-128
+18
1.80
64 mW
-31
6.25
-80
.01 nW
-129
