dBm to Watt & Power Converter
Convert RF and optical signal power between dBm, milliwatts (mW), watts (W), and decibel ratios.
Understanding Logarithmic RF & Optical Power Scale (dBm)
dBm is a logarithmic power unit referenced to 1 milliwatt (0 dBm = 1 mW). Decibels simplify signal calculations by allowing addition/subtraction instead of multiplication.
Wireless and fiber optic engineers switch between logarithmic dBm ratings (e.g., +30 dBm transmitter output) and linear Watt metrics (e.g., 1 Watt transmitter power).
Interactive dBm to Watt & Power Converter Workspace
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dBm to Watt Converter
Convert RF power between dBm, mW and watts, and dB gain to a linear ratio.
dBm to Watt Converter
Real-World Calculation Walkthrough
Converting a +30 dBm radio transmitter output into Milliwatts and Watts
Input Parameters
Calculation Output
dBm to Watt & Power Converter Engineering FAQs
What is the rule of 3 dB and 10 dB in RF power?
Adding +3 dB doubles power in Watts (e.g., 20 dBm = 100 mW, 23 dBm = 200 mW). Adding +10 dB increases power tenfold (e.g., 10 dBm = 10 mW, 20 dBm = 100 mW).
What does negative dBm indicate (e.g., -20 dBm)?
Negative dBm represents power levels below 1 milliwatt. For example, -20 dBm equals 0.01 mW (10 microwatts), typical for optical receiver power.
What is the difference between dB, dBm, and dBi?
dB measures relative gain/loss ratio; dBm measures absolute power referenced to 1 mW; dBi measures antenna gain relative to an isotropic radiator.
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