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Instant result
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Online Calculator
dBm to watts converter
Convert absolute power levels between dBm, milliwatts, and watts.
Information
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
What power is 0 dBm?
1 mW.
What power is 30 dBm?
1 W.
What's the formula?
dBm = 10 log₁₀(PmW).
Can it convert in both directions?
Yes.