dB Calculator

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Calculates sound intensity levels in decibels (dB) or changes in dB based on power or intensity ratios.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Reference Power (W), Power (W), Reference Intensity (W/m²), and Intensity (W/m²) in the units shown.

Step 2

Read Intensity Level (dB) and Power Level (dB) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Reference Power (W): 1 W; Power (W): 2 W; Reference Intensity (W/m²): 1 W/m²; Intensity (W/m²): 1 W/m²

Intensity Level (dB): 0 dB; Power Level (dB): 3.010299957 dB

Reference Power (W): 1 W; Power (W): 10 W; Reference Intensity (W/m²): 1 W/m²; Intensity (W/m²): 1 W/m²

Intensity Level (dB): 0 dB; Power Level (dB): 10 dB

Reference Power (W): 1 W; Power (W): 1 W; Reference Intensity (W/m²): 1 W/m²; Intensity (W/m²): 2 W/m²

Intensity Level (dB): 3.010299957 dB; Power Level (dB): 0 dB

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