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Converting Power (dBm) To Milliwatts

A decibel is a measurement that expresses a power ratio, rather than an absolute number. One advantage of using decibels to express power instead of milliwatts is that decibels allow attenuation to be expressed as whole numbers. Milliwatts, on the other hand, would typically be expressed as fractions, which are more cumbersome. For example, 13 dBm = 19.953 milliwatts. This advantage is clearly shown on the chart below.


Power to Miliwatts Conversion Table

dBm

MilliWatts

dBm

MilliWatts

dBm

MilliWatts

-40

.00010

-13

.0501

15

31.623

-37

.00019

-10

.10

17

50.119

-35

.00032

-7

.1995

20

100.0

-33

.00050

-5

.3162

23

199.53

-30

.001

-3

.5012

25

316.23

-27

.002

0

1.0

27

501.19

-25

.00316

3

1.9953

30

1.00w

-23

.00601

5

3.1623

33

1.99w

-20

.01

7

5.0119

35

3.16w

-17

.01995

10

10.0

37

5.01w

-15

.03162

13

19.953

40

10.00w