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Convert power ratio to decibel

Convert power ratio (× power) to decibel (dB) instantly. See the formula, a quick table and every other sound level and ratios unit. Free, no ads.

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Power ratio to decibel

dB = 10 × log₁₀(power ratio).

power ratio (× power)	decibel (dB)
1	0
2	3.0103
5	6.9897
10	10
20	13.0103
50	16.9897
100	20
1,000	30

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