Watt to dBm conversion table

Watt to dBm conversion table

Power (mW) Power (dBm)
0 W not defined
0+ W -∞ dBm
0.00001 W -20.0000 dBm
0.0001 W -10.0000 dBm
0.001 W 0.0000 dBm
0.01 W 10.0000 dBm
0.1 W 20.0000 dBm
1 W 30.0000 dBm
10 W 40.0000 dBm
100 W 50.0000 dBm
1000 W 60.0000 dBm
10000 W 70.0000 dBm
100000 W 80.0000 dBm
1000000 W 90.0000 dBm

1. dBm mW
2. 0 1.0 mW
3. 1 1.3 mW
4. 2 1.6 mW
5. 3 2.0 mW
6. 4 2.5 mW
7. 5 3.2 mW
8. 6 4.0 mW
9. 7 5.0 mW
10. 8 6.0 mW
11. 9 8.0 mW
12. 10 10 mW
13. 11 13 mW
14. 12 16 mW
15. 13 20 mW
16. 14 25 mW
17. 15 32 mW
18. 16 40 mW
19. 17 50 mW
20. 18 64 mW
21. 19 80 mW
22. 20 100 mW
23. 21 128 mW
24. 22 160 mW
25. 23 200 mW
26. 24 250 mW
27. 25 320 mW
28. 26 400mW
29. 27 500mW
30. 28 640mW
31. 29 800mW
32. 30 1.0W
33. 31 1.3W
34. 32 1.6W
35. 33 2.0W
36. 34 2.5W
37. 35 3.0W
38. 36 4.0W
39. 37 5.0W
40. 38 6.0W
41. 39 8.0W
42. 40 10W
43. 41 13W
44. 42 16W
45. 43 20W
46. 44 25W
47. 45 32W
48. 46 40W
49. 47 50W
50. 48 64W
51. 49 80W
52. 50 100W
53. 60 1000W

How to convert watts to dBm

The power P(dBm) in dBm is equal to 10 times the base 10 logarithm of 1000 times the power P(W) in watts (W) divided by 1 watt (W):
P(dBm) = 10 · log10( 1000 · P(W) / 1W) = 10 · log10( P(W) / 1W) + 30
so

```1W = 30dBm
```

Example
Convert 20 watts to dBm:

```P(dBm) = 10 · log10(1000·20W) = 43.0103dBm
```