The decibel is a dimensionless quantity used to express the ratio of one power quantity to another.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

5 sources for · 0 against

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Is it true that the decibel is a dimensionless quantity used to express the ratio of one power quantity to another?

Yes. Multiple reliable reference and study sources confirm that the decibel is a dimensionless quantity used to express the ratio of power quantities.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked 4 Oct 2026

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Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 5

Wikipedia: Decibel

Reference article covering this claim directly

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Wikipedia: Decibel. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Decibel

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More for · 4

PLOS (all journals): Sensitivity to gait improvement after levodopa intake in Parkinson’s disease: A comparison study among synthetic kinematic indices

Describes logarithmic ratio yielding a dimensionless parameter expressed in decibels.

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PLOS (all journals): Sensitivity to gait improvement after levodopa intake in Parkinson’s disease: A comparison study among synthetic kinematic indices. (n.d.). PLOS (all journals). https://doi.org/10.1371/journal.pone.0268392

LibreTexts: LibreTexts: 1.03: RF Power Calculations

Confirms dB is dimensionless and indicates a power ratio.

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LibreTexts: LibreTexts: 1.03%3A RF Power Calculations. (n.d.). LibreTexts. https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Fundamentals_of_Microwave_and_RF_Design_(Steer)/01%3A_Introduction_to_Microwave_Engineering/1.03%3A_RF_Power_Calculations

Wikibooks: Wikibooks: Physics Study Guide/Sound

Explicitly states the decibel is a dimensionless quantity expressing the ratio of power quantities.

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Wikibooks: Wikibooks: Physics Study Guide/Sound. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/Physics_Study_Guide/Sound

LibreTexts: LibreTexts: 1.06: RF Power Calculations

Notes that dB is dimensionless and indicates a power ratio.

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LibreTexts: LibreTexts: 1.06%3A RF Power Calculations. (n.d.). LibreTexts. https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Microwave_and_RF_Design_I_-_Radio_Systems_(Steer)/01%3A_Introduction_to_RF_and_Microwave_Systems/1.06%3A_RF_Power_Calculations

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