Reverb Time (RT60) Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
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 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.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.