Music Calculators
Decibel Calculator

Decibel Calculator

Calculate decibel with Calculator 360 using the available inputs.

Calculation

Dry-air temperature (°C)

Sound speed override (m/s, optional)

Known wave measurement

Frequency (Hz)

Wavelength (m)

Rectangular room

Room length Lx (m)

Room width Ly (m)

Room height Lz (m)

Highest mode index (1 to 6)

Maximum modes to list (1 to 200)

Absorbing surfaces (RT60)

Surface area 1 (m²)

Absorption coefficient 1 (0 to 1)

Surface area 2 (m²)

Absorption coefficient 2 (0 to 1)

Surface area 3 (m²)

Absorption coefficient 3 (0 to 1)

Surface area 4 (m²)

Absorption coefficient 4 (0 to 1)

Decibels re 20 µPa

RMS sound pressure (Pa)

Sound-pressure level Lp (dB re 20 µPa)

Uncorrelated levels separated by ; (dB re 20 µPa) Enter 1 to 20 uncorrelated levels separated by semicolons, e.g. 60;60.

Initial distance r₁ (m)

New distance r₂ (m)

Second level Lp (dB re 20 µPa)

Try an example

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How to use this calculator

Calculate sound speed and wavelength, rectangular-room modes, theoretical Sabine RT60, and unweighted sound-pressure levels. These results are estimates, not instrument measurements.

Enter the values required by the selected mode. Results use the shared calculator engine and its stated limits.

Theoretical local calculations; no measurement or third-party request is made. References: ISO 16 A4 = 440 Hz · BIPM hertz and SI · MIDI Association note numbers · ISO 3382-2 RT60 measurement · NIST reference pressure · NASA speed of sound ·

Frequently asked questions

What does this tool calculate?

Calculate sound speed and wavelength, rectangular-room modes, theoretical Sabine RT60, and unweighted sound-pressure levels. These results are estimates, not instrument measurements.

Are the results estimates?

Check the assumptions and limits shown for the selected calculation.