Free Acoustic Power Calculator
Calculate the sound power level in decibels: Lw = 10 * log10(W / W0), where W0 = 1e-12 W is the reference power.
W
Sound Power Level
100.00 dB
Intensity at 1 m (free field)0.00079577 W/m2
Sound Power Level vs Sound Power
Sound Power Level
Sound power is the total acoustic energy emitted by a source per second, independent of distance or room.
Formula
Lw = 10 log10(W / W0)
Sound power is an intrinsic property of the source. Intensity at distance r in free field: I = W / (4 pi r^2).
Example Calculation
A loudspeaker emitting 0.01 W.
- 01Lw = 10 log10(0.01 / 1e-12)
- 02Lw = 10 log10(1e10)
- 03Lw = 10 * 10 = 100 dB
- 04Intensity at 1 m = 0.01 / (4 pi) = 7.96e-4 W/m2
Frequently Asked Questions
Learn More
Understanding Newton's Laws of Motion
A comprehensive guide to Newton's three laws of motion. Learn about inertia, force and acceleration, action-reaction pairs, and how these principles govern everyday physics.