AI Tools
Health
Math
Everyday Life
Finance
Physics
Chemistry
Statistics
Construction
Pets
Time & Date
Conversion Calculator
Sign InFollow Us On:
Follow Us On:
Choose the values, enter the power in dBm, and the tool will instantly calculate the relative watt values
Related
This dBm to watts calculator is used to convert power measurements between decibel-milliwatts (dBm), watts (W), and milliwatts (mW). It allows quick and accurate conversion for electrical signals and power levels.
dBm stands for decibels relative to one milliwatt and is a unit of power. It is commonly used to describe the strength of an electrical signal, such as from an antenna or amplifier.
The formula to convert dBm to watts is:
P(W) = 1 W ⋅ 10^((P(dBm) – 30) / 10)
Where:
This calculator also works in reverse, converting watts back to dBm. Using a dBm to watts calculator, you can easily convert dBm values to watts (W) or milliwatts (mW).
The formula to convert dBm to Milliwatts is as:
P(mW) = 1 mW ⋅ 10^(P(dBm)/10)
Where:
The formula for converting watts to dBm is:
P(dBm) = 10 ⋅ log10(P(W)/1 W) + 30
Where:
Use the formula:
P(dBm) = 10 ⋅ log10(P(mW)/1 mW)
Where:
Suppose a signal has a power of 30 dBm. What is the equivalent in watts?
Solution:
Using the dBm to watts formula:
P(W) = 1 W ⋅ 10^((30 – 30)/10) = 1 W
To convert watts to milliwatts, multiply by 1000:
P(mW) = 1000 mW
The table below shows common conversions between dBm, watts, and milliwatts.
| Power (dBm) | Power (dBW) | Power (W) | 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 |
| 0 dBm | -30 dBW | 1 mW | 1 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 calculator converts power values quickly using the following steps:
Input:
Output:
0 dBm is equal to 0.001 watts (1 milliwatt).
10 dBm is equal to 0.01 watts (10 milliwatts).
20 dBm is equal to 0.1 watts (100 milliwatts).
40 dBm is equal to 10 watts (10,000 milliwatts).
Yes, dBm is a unit used to express power levels in decibels relative to 1 milliwatt (mW). It is commonly used in radio communication, wireless networks, and electronics.
References:
From Wikipedia: dBm. From WilsonPro: Difference between dB and dBm explained.
Related
Add this calculator to your site.
×Just copy a given code & paste it right now into your website HTML (source) for suitable page.
Preview:
Easter into Action, Save With Satisfaction
UPTO
50 %
OFF
Give Us Your Feedback
Share Result
dBm to Watts Calculator
Links
Home Conversion Calculator About Calculator Online Blog Hire Us Knowledge Base Sitemap Sitemap TwoEmail us at
Contact Us© Copyrights 2026 by Calculator-Online.net
How was your experience today?
Not now
Awesome! Would you mind sharing that on Trustpilot?
Your review helps others find a tool that actually works.
Write a Review on TrustpilotNot now
Sorry to hear that
Tell us what went wrong — we read every message.
Not now
Thanks for your feedback!
We'll use it to make things better.
