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dBm to Watts Calculator

dBm to Watts Calculator

Choose the values and enter the power in dBm and the tool will calculate the relative watt values.

Conversion Type

Power in dBm


Table of Content

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This dBm to watts calculator interchanges and converts the power measurements between units of decibel milliwatts (dBm) and watts (W), and milliwatts(mW).

What is dBm?

dBm is the acronym for Decibels per milliwatt & is a unit of power. 

The intensity of the sound and the electrical signal power is described in the Decibels per milliwatt(dBm). dBm describes the amount of power an antenna or an amplifier is able to produce. You can transform the units between decibels per milliwatt (dBm) and watts (W)/milliwatts (mW) with the help of dBm to watts calculator.

How to Convert dBm to Watts?

Our calculator uses the following formula for dB to watts conversion:

P (W) = 1W ⋅ 10((P(dBm) – 30) / 10)


P (W) =  power in watts

P (dBm) =  power in dBm

Our db to watts converter gauges the dBm from Watt and back Watt from dBm.

How to Convert dBm to mW?

For dBm to milliwatt conversion, you need to use the formula:

P(mW) = 1mW ⋅ 10(P(dBm) / 10)


P(mW) = power in milliwatts

 P(dBm) = power in dBm

How to Convert Watt to dBm?

For watts to dBm conversion use the formula:

P(dBm) = 10 ⋅ log10( P(W) / 1W) + 30


P(dBm) = power in dBm 

P(W) = power in watts

How to Convert mW to dBm?

The mW to dBm conversion can be done by the following formula:

P(dBm) = 10 ⋅ log10(P(mW) / 1mW)


 P(dBm) =power in dBm 

P(mW) =  power in milliwatts.

Practical Example:

Let’s consider there is a signal with a power of 30 dBm, then what is the dBm to watt conversion?


Now for the dBm to watt conversion, use the dBm to watts formula

P(W) = 1W ⋅ 10(P (dBm) / 10) / 1000

Enter the values of the dBm:

P(watts) = 10(30/10) / 1000 =1 watts

To covert the dBm to milliwatt multiplied it by 1000:

P(milliWatt) = 1000 mW

The dBm to Watt Conversion Table:

The dBm to watt conversion table makes it easy to understand the concept:

Power (dBm) Power (dBW) Power (watt) Power (mW)
-100 dBm -130 dBW 0.1 pW 0.0000000001 mW
-90 dBm -120 dBW 1 pW 0.000000001 mW
-80 dBm -110 dBW 10 pW 0.00000001 mW
-70 dBm -100 dBW 100 pW 0.0000001 mW
-60 dBm -90 dBW 1 nW 0.000001 mW
-50 dBm -80 dBW 10 nW 0.00001 mW
-40 dBm -70 dBW 100 nW 0.0001 mW
-30 dBm -60 dBW 1 μW 0.001 mW
-20 dBm -50 dBW 10 μW 0.01 mW
-10 dBm -40 dBW 100 μW 0.1 mW
-1 dBm -31 dBW 794 μW 0.794 mW
0 dBm -30 dBW 1.000 mW 1.000 mW
1 dBm -29 dBW 1.259 mW 1.259 mW
10 dBm -20 dBW 10 mW 10 mW
20 dBm -10 dBW 100 mW 100 mW
30 dBm 0 dBW 1 W 1000 mW
40 dBm 10 dBW 10 W 10000 mW
50 dBm 20 dBW 100 W 100000 mW
60 dBm 30 dBW 1 kW 1000000 mW
70 dBm 40 dBW 10 kW 10000000 mW
80 dBm 50 dBW 100 kW 100000000 mW
90 dBm 60 dBW 1 MW 1000000000 mW
100 dBm 70 dBW 10 MW 10000000000 mW

The db to watts calculator is a useful tool for converting power levels between units (dBm) to milliwatts (mW) and Watts.

The Working of dBm to Watts Calculator:

Let’s see the dBm to watt calculator functionality in simple steps:


  • Choose the conversion type
  • Enter the units
  • Hit the calculate 


  • dBm to watts conversion
  • Watts to dBm conversion
  • dBm to milliwatts conversion


From the source Wikipedia: dBm, Watts
From the source of dB, What is dBm?