Audio & acoustics

dB calculator

You can convert linear relationships into dB or derive power and voltage ratios from dB.

Updated on Apr 24, 2026 Calculator, calculation path and examples on one page

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Calculator

Calculation mode

Linear relationship

Level difference in dB

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Examples

Linear power ratio 2 to 1.

Level difference: 3.01dB

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Linear tension ratio 2 to 1.

Level difference: 6.02dB

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Convert level difference into linear power ratio.

Performance ratio: 10,000x

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FAQ

Why is power 10 log and voltage 20 log?

Power is the square of voltage. Therefore, the logarithm factor doubles for voltage and amplitude ratios.

When does +3 dB correspond to a doubling?

When it comes to performance. A power ratio of 2:1 corresponds to around +3.01 dB.

When does +6 dB correspond to a doubling?

At voltage or amplitude. A voltage ratio of 2:1 corresponds to around +6.02 dB.

Can I compare power and voltage directly?

Only if the impedance remains the same. Otherwise the relationship between voltage and power will change.

Is the dB calculator also suitable for studio levels?

Yes. It is well suited for classifying level differences and relationships in audio and measurement technology.

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Sources and notes

Formulas: dB = 10 x log10(P2/P1), dB = 20 x log10(U2/U1), P2/P1 = 10^(dB/10), U2/U1 = 10^(dB/20)
Note: The relationship between power and voltage only applies when impedance is the same.