Watt to dBm conversion table

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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

Detailed Table Version

  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