Tempo reverberação Sabine
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Sabine Reverberation Time (RT60) calculator estimates how long it takes for sound in a space to decay by 60 dB after the source stops. It uses the formula RT60 = 0.161 × V / A, where V is the room volume (in m³) and A is the equivalent absorption area (in m²). It's widely applied in architectural acoustics for designing rooms, auditoriums, and studios.
Sabine's formula assumes diffuse surfaces and linear absorption. Accurate calculations require precise volume measurements and consideration of the materials' absorption properties. Typical RT60 values range from 0.3 to 2 seconds, depending on the application (e.g., classrooms vs. concert halls).
This calculation is vital for acoustic isolation projects and reverberation adjustments in existing spaces. However, for very large or geometrically complex environments, advanced formulas like Norris-Eyring may be needed. The Sabine calculator is best suited for cases where absorption uniformity is confirmed.
Frequently asked questions
What is RT60 reverberation time?
It's the time sound takes to decay 60 dB after the source stops, indicating a space's acoustic clarity.
When to use Sabine's formula?
When the room has evenly distributed absorptive materials and regular geometry.
How to calculate equivalent absorption area (A)?
Multiply each surface's area by its absorption coefficient and sum the results.
Which units should I use in the calculator?
Volume in cubic meters (m³) and absorption area in square meters (m²).
Is Sabine's formula valid for all room types?
No, large or irregularly shaped rooms require advanced methods like Norris-Eyring.