Decibel Calculator

Decibel Calculator

Calculate ratios to decibels, add sound levels, or determine distance attenuation.

Calculation Type

Value Type

Power (10×log) Voltage/Pressure (20×log)

Reference Value (V₁ / P₁) Must be > 0

Value must be greater than zero.

Measured Value (V₂ / P₂) Must be > 0

Value must be greater than zero.

Sound Level 1

dB

Please enter a valid number.

Sound Level 2

dB

Please enter a valid number.

Initial Sound Level

dB

Initial Distance (d₁) > 0

m / ft

Distance must be greater than zero.

Final Distance (d₂) > 0

m / ft

Distance must be greater than zero.

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Enter values and click Calculate to see the decibel result.

Result

0.00 dB

Note: Power quantities (e.g., Watts, acoustic power) use the 10×log₁₀ ratio. Field quantities (e.g., Voltage, sound pressure) use the 20×log₁₀ ratio.