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Conversion of Power ( Watts to dBm)

The attached pdf table shows conversion of power from watts to dBm. The range is from 1 microwatt to 100 Watts or -30 dBm to +50 dBm.

It is based on the formula 

X (dBm)=10 log Y (mW)

Micro
Watts

dBm

Micro
Watts

dBm

Milli
Watts

dBm

Milli
Watts

dBm

Watts

dBm

1

-30

100

-10

1

0

100

20

1

30

2

-26.99

125

-9.03

2

3.01

125

20.97

2

33.01

3

-25.23

150

-8.24

3

4.77

150

21.76

3

34.77

4

-23.98

175

-7.57

4

6.02

175

22.43

4

36.02

5

-23.01

200

-6.99

5

6.99

200

23.01

5

36.99

6

-22.22

225

-6.48

6

7.78

225

23.52

6

37.78

7

-21.55

250

-6.02

7

8.45

250

23.98

7

38.45

8

-20.97

275

-5.61

8

9.03

275

24.39

8

39.03

9

-20.46

300

-5.23

9

9.54

300

24.87

9

39.54

10

-20

325

-4.88

10

10

325

25.12

10

40

15

-18.24

350

-4.56

15

11.76

350

25.44

15

41.76

20

-16.99

375

-4.26

20

13.01

375

25.74

20

43.01

25

-16.02

400

-3.98

25

13.98

400

26.02

25

43.98

30

-15.23

425

-3.72

30

14.77

425

26.28

30

44.77

35

-14.56

450

-3.47

35

15.44

450

26.53

35

45.44

40

-13.98

475

-3.23

40

16.02

475

26.77

40

46.02

45

-13.47

500

-3.01

45

16.53

500

26.99

45

46.53

50

-13.01

525

-2.8

50

16.99

525

27.2

50

46.99

55

-12.6

550

-2.6

55

17.4

550

27.4

55

47.4

60

-12.22

600

-2.22

60

17.78

600

27.78

60

47.78

65

-11.87

650

-1.87

65

18.13

650

28.13

65

48.13

70

-11.55

700

-1.55

70

18.45

700

28.45

70

48.45

75

-11.25

750

-1.25

75

18.75

750

28.75

75

48.75

80

-10.97

800

-0.97

80

19.03

800

29.03

80

49.03

85

-10.71

850

-0.71

85

19.29

850

29.29

85

49.29

90

-10.46

900

-0.46

90

19.54

900

29.54

90

49.54

95

-10.22

950

-0.22

95

19.78

950

29.78

95

49.78

100

-10

1000

0

100

20

1000

30

100

50

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