Reverb Time (RT60) Calculator
Estimate RT60 reverberation time for a room from volume and surface absorption using this free acoustics calculator in your browser.
Enter Values
Minimum 0
How to use this calculator
- Enter the room volume and total absorption (sabins).
- Read the RT60.
How it works
Sabine: RT60 = 0.161 × volume ÷ total absorption.
Worked example
200 m³, 40 sabins. RT60 ≈ 0.80 s.
Common mistakes
- Total absorption is each surface's area × its absorption coefficient, summed — not just area.
- Sabine is least accurate in very dead or very live rooms.
Frequently asked questions
What is RT60?
The time for sound to decay by 60 dB after the source stops. Sabine's formula estimates it from room volume and total absorption.
What is a good reverb time?
It depends on use — around 0.3–0.5 s for a studio or control room, longer for concert halls where richness is wanted.
What RT60 is good?
Speech rooms want ~0.4–0.6 s; concert halls ~1.8–2.2 s. It depends on the room's use.
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Cite this tool
Zerdly. (2026). Reverb Time (RT60) Calculator. Retrieved from https://www.zerdly.com/tools/reverb-time-calculator/
Tip: Enter any known values to calculate the remaining results.
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