dBm to Watts Calculator Online

This online calculator converts power levels from dBm (decibels-milliwatts) to watts (W). dBm is a logarithmic unit used in electronics and telecommunications, while watt is the SI base unit for power.

dBm to Watts (W) Converter

Enter a value in dBm and press the button

dBm

Result in Watts (W)

Swap

Calculation process will appear here.

Decimal Places

How to Use

Enter a value in dBm in the input field.
Set the number of decimal places you want (default is 6).
Click the “Convert” button to get the equivalent value in watts.
The result appears in the output field.
Use “Copy Result” to copy the result to your clipboard.
Click “Clear All” to reset the form.
Use the “Swap” button to convert from watts to dBm.

Unit Definitions

Decibel-milliwatts (dBm)

dBm is a logarithmic unit of power relative to 1 milliwatt (mW). It is commonly used in RF engineering, Wi-Fi, and telecommunications to express absolute power levels. Abbreviation: dBm. System: logarithmic, derived. 0 dBm = 1 mW. The conversion to watts is done using the formula: W = 10^((dBm – 30) / 10).

Watt (W)

The watt (symbol: W) is the SI unit of power, defined as one joule per second. It measures the rate at which energy is transferred. Abbreviation: W. System: SI. 1 W = 1000 mW. When converting from dBm, 1 mW = 0 dBm, so 1 W = 30 dBm.

Conversion Table

dBm	Watts (W)
-90	1.00E-12
-60	1.00E-09
-30	1.00E-06
-10	0.0001
0	0.001
1	0.00126
2	0.00158
3	0.001995
4	0.00251
5	0.00316
10	0.01
12	0.01585
13	0.01995
14	0.02512
15	0.03162
16	0.03981
17	0.05012
18	0.0631
19	0.07943
20	0.1
21	0.12589
22	0.15849
23	0.19953
24	0.25119
25	0.31623
26	0.39811
27	0.50119
28	0.63095
29	0.79433
30	1
31	1.2589
32	1.5849
33	1.9953
34	2.5119
35	3.1623
36	3.9811
37	5.0119
38	6.3096
39	7.9433
40	10
43	19.95
44	25.12
45	31.62
46	39.81
47	50.12
48	63.1
49	79.43
50	100
60	1000