Room Acoustics Calculator

Calculate RT60 reverb time and room modes from room dimensions.

Inputs

Room Length

Room Width

Ceiling Height

Avg. Absorption Coefficient

Tab to move between fields

Results

RT60 Reverb Time

0.54 sec

Room Volume76.5 m³

Length Mode28.1 Hz

Width Mode37.5 Hz

Height Mode62.5 Hz

How to Use This Calculator

Enter Room Length, Room Width, and Ceiling Height.
Set Avg. Absorption Coefficient.
Review the RT60 Reverb Time (sec) result.
Use Room Volume (m³) and Length Mode (Hz) to inform your decision.

How the result changes with Avg. Absorption Coefficient

Avg. Absorption Coefficient	RT60 Reverb Time
0.11	0.99 sec
0.36	0.3 sec
0.65	0.16 sec
0.9	0.12 sec

What each input means

Room Length: Interior length of the room in feet.
Room Width: Interior width of the room in feet.
Ceiling Height: Floor-to-ceiling height in feet.
Avg. Absorption Coefficient: Average absorption coefficient of room surfaces (0.1 = reflective, 0.5 = treated, 0.9 = anechoic).

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Room Length = 20, Room Width = 15, Ceiling Height = 9, Avg. Absorption Coefficient = 0.2 = 4 input(s) provided
Calculate RT60 Reverb Time
RT60 Reverb Time
0.54 = 0.54
Calculate Room Volume
Room Volume
76.5 = 76.5
Calculate Length Mode
Length Mode
28.1 = 28.1

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