Calculate sound intensity level in decibels from sound intensity and reference intensity. This calculator shows intensity level, intensity ratio, formula used, level category, and step-by-step calculation details.
Sound intensity:
Enter the acoustic intensity value. Sound intensity is often measured in watts per square meter.
Reference intensity:
The calculator compares your intensity to a reference intensity. The common air reference is 1 × 10⁻¹² W/m².
Formula:
Sound intensity level uses 10 × log10 because intensity is a power-per-area quantity.
A sound intensity calculator helps convert acoustic intensity into a decibel level. It can be useful for acoustics, physics, noise analysis, sound measurement, speaker output estimates, and engineering comparisons.
Sound intensity level is related to sound energy flow. Sound pressure level is measured from pressure changes at a point and uses a different formula.
The standard sound intensity level formula is:
LI = 10 × log10(I ÷ I₀)
Sound intensity is the acoustic power passing through a unit area. It is commonly measured in watts per square meter.
The common reference intensity for sound in air is 1 picowatt per square meter, which equals 0.000000000001 W/m².
No. Sound intensity measures energy flow through an area. Sound pressure measures pressure variation caused by a sound wave.
Sound intensity level uses 10 × log10 because intensity is a power-per-area quantity. Sound pressure level uses 20 × log10 because pressure is an amplitude-style quantity.