Reverb Time (RT60) Calculator

Calculate room reverberation time using the Sabine and Eyring formulas. Determine if a room is suitable for recording, performance, or speech.

Inputs

Room Volume

cu yd

Total Surface Area

sq ft

Average Absorption Coefficient

Tab to move between fields

Results

RT60 (Sabine)

0.64 s

RT60 (Eyring)0.58 s

RT300.32 s

Early Decay Time0.45 s

Mean Free Path3.2 m

Reverb CharacterModerate — lecture hall, living room

Ideal UseRecording studio, classroom, conference room

How to Use This Calculator

Enter Room Volume, Total Surface Area, and Average Absorption Coefficient.
Review the RT60 (Sabine) (s) result.
Use RT60 (Eyring) (s) and RT30 (s) to inform your decision.

How the result changes with Total Surface Area

Total Surface Area	RT60 (Sabine)
5,001	0.03 s
17,501	0.01 s
32,500	0.01 s
45,000	0 s

What each input means

Room Volume: Total volume of the room in cubic meters. Typical living room is 40-80 m³; concert hall is 10,000-30,000 m³.
Total Surface Area: Total interior surface area (walls + floor + ceiling) in square meters.
Average Absorption Coefficient: Average absorption coefficient of all surfaces (0 = fully reflective, 1 = fully absorptive). Concrete ~0.02, carpet ~0.3, acoustic panels ~0.8.

How this is calculated

Worked example, using the default values

Identify Input Parameters
Room Volume = 200, Total Surface Area = 250, Average Absorption Coefficient = 0.2 = 3 input(s) provided
Calculate RT60
RT60 = rt60
0.644 = 0.644
Calculate RT60
RT60
0.577 = 0.577
Calculate RT30
RT30
0.322 = 0.322

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