Acoustic Reverberation Time Calculator
Estimate the time required for sound level to decay by 60 dB in a diffuse room using a simplified Sabine model.
How to use this calculator
- Enter room volume (m³), total equivalent absorption (metric sabins); check the units and use values from the same period or scenario.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Sabine estimate RT60 (seconds) ≈ 0.161 × room volume in m³ ÷ equivalent absorption in metric sabins.
- Estimated RT60 is about 0.828 seconds.
- The Sabine model assumes a diffuse sound field and may be inaccurate in small, irregular, highly absorptive or strongly coupled spaces.
Worked examples
Worked example
A 180 m³ room has an equivalent absorption area of 35 metric sabins.
Estimated RT60 is about 0.828 seconds.
Estimated RT60 is about 0.828 seconds.
Understanding the result
Estimated RT60 is about 0.828 seconds.
The Sabine model assumes a diffuse sound field and may be inaccurate in small, irregular, highly absorptive or strongly coupled spaces.
Important notes
The Sabine model assumes a diffuse sound field and may be inaccurate in small, irregular, highly absorptive or strongly coupled spaces.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
What does RT60 mean?
It is the time for sound energy level to decay by 60 dB after the source stops.
Does this replace acoustic design?
No. Room geometry, frequency-dependent absorption, occupancy and measurement standards matter.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.