Power Calculator

Convert between dBm and watts. Edit either field and the other one updates automatically.

dBm
Formula: W = 10^((dBm - 30) / 10)
W
Formula: dBm = 10 × log10(W) + 30

Conversion Formula

W = 10(dBm - 30) / 10
dBm = 30 + 10 log10(W)

Graph View

dBm to watts Conversion Chart

Power (dBm) Power (W)
-30 dBm0.000001 W
-20 dBm0.00001 W
-10 dBm0.0001 W
0 dBm0.001 W
1 dBm0.0012589 W
2 dBm0.0015849 W
3 dBm0.0019953 W
4 dBm0.0025119 W
5 dBm0.0031623 W
6 dBm0.0039811 W
7 dBm0.0050119 W
8 dBm0.0063096 W
9 dBm0.0079433 W
10 dBm0.01 W
20 dBm0.1 W
30 dBm1 W
40 dBm10 W
50 dBm100 W

Percent to 0.1 dBm Change Chart

Percent Change 0.1 dBm Change
-50%-30.103
-30%-15.490
-20%-9.691
-15%-7.058
-10%-4.576
-5%-2.228
0%0
+5%+2.119
+10%+4.139
+15%+6.070
+20%+7.918
+30%+11.394
+50%+17.609