dBm to Watts Calculator
Choose the values and enter the power in dBm and the tool will calculate the relative watt values.
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:
\( P(\text{W}) = 1\,\text{W} \cdot 10^{\frac{P(\text{dBm}) - 30}{10}} \)
Where:
- \( P(\text{W}) \) = power in watts
- \( P(\text{dBm}) \) = 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, use the formula:
\( P(\text{mW}) = 1\,\text{mW} \cdot 10^{\frac{P(\text{dBm})}{10}} \)
Where:
- \( P(\text{mW}) \) = power in milliwatts
- \( P(\text{dBm}) \) = power in dBm
How to Convert Watt to dBm?
For watts to dBm conversion, use the formula:
\( P(\text{dBm}) = 10 \cdot \log_{10}\left(\frac{P(\text{W})}{1\,\text{W}}\right) + 30 \)
Where:
- \( P(\text{dBm}) \) = power in dBm
- \( P(\text{W}) \) = power in watts
How to Convert mW to dBm?
The mW to dBm conversion can be done by the following formula:
\( P(\text{dBm}) = 10 \cdot \log_{10}\left(\frac{P(\text{mW})}{1\,\text{mW}}\right) \)
Where:
- \( P(\text{dBm}) \) = power in dBm
- \( P(\text{mW}) \) = power in milliwatts
Example:
Let's consider a signal with a power of 30 dBm. What is the dBm to watt conversion?
Solution:
For the dBm to watt conversion, we use the formula:
\( P(\text{W}) = 1\,\text{W} \cdot 10^{\frac{P(\text{dBm})}{10}} / 1000 \)
Enter the value of dBm:
\( P(\text{W}) = \frac{1 \cdot 10^{30/10}}{1000} = 1\,\text{W} \)
To convert watts to milliwatts, multiply by 1000:
\( P(\text{mW}) = 1\,\text{W} \cdot 1000 = 1000\,\text{mW} \)
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:
Input:
- Choose the conversion type
- Enter the units
- Hit the calculate
Output:
- dBm to watts conversion
- Watts to dBm conversion
- dBm to milliwatts conversion
References:
From the source Wikipedia: dBm, Watts From the source of Wilsonpro.com dB, What is dBm?
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