Free Sound Transmission Loss Calculator
Estimate the sound transmission loss of a single-leaf wall using the mass law: TL = 20 * log10(f * m) - 47.3 dB.
Hz
kg/m2
Transmission Loss
32.70 dB
Transmission Loss vs Frequency
Mass Law for Sound Transmission Loss
The mass law gives the theoretical TL of a single homogeneous panel.
Formula
TL = 20 log10(f m) - 47.3 dB
Doubling the mass or frequency increases TL by about 6 dB. This is the field-incidence mass law, valid below the coincidence frequency.
Example Calculation
20 kg/m2 concrete panel at 500 Hz.
- 01TL = 20 log10(500 * 20) - 47.3
- 02TL = 20 log10(10000) - 47.3
- 03TL = 20 * 4 - 47.3
- 04TL = 80 - 47.3 = 32.7 dB
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