Sahyun's Physics Applets in HTML5

Room Reverberation Time Calculator

Sabine Equation: $T_{60} = (0.16)\frac{V}{A_T}$ where $V$ is the room volume and the total effective absorbing area is given by $A_T = \sum_{\text{Surf}}A_{\text{Surf}}\alpha_{\text{Surf}}+\sum_{\text{Obj}}EA_{\text{Obj}}$

Enter room dimensions, select materials, and the page will compute reverberation time at 125 Hz, 500 Hz, and 2000 Hz.

Room Dimensions

Length (m) Width (m) Height (m)

Surface Materials

Material absorption coefficients for frequencies of 125, 500, and 2000 Hz.

Ceiling Material α: 0.15, 0.5, 0.7 Floor Material α: 0.15, 0.5, 0.7 Wall 1 Material α: 0.15, 0.5, 0.7 Wall 2 Material α: 0.15, 0.5, 0.7 Wall 3 Material α: 0.15, 0.5, 0.7 Wall 4 Material α: 0.15, 0.5, 0.7

Occupancy

Effective Absorbing area EA of objects.

People Chairs

Results

Room Volume: 0 m³

Absorbing Areas (m² sabins)

Surface	125 Hz	500 Hz	2000 Hz
Ceiling
Floor
Walls
Objects
Total A

$T_{60}$ (seconds) =

125 Hz	500 Hz	2000 Hz

This simulator of 3D room visualization and interactive reverberation calculations was developed with assistance from ChatGPT (OpenAI) on November 24, 2025