Room Reverberation Time
Estimate RT60 reverb time from room size and absorption.
About Room Reverberation Time
Sabine's equation relates reverb time to the room's size divided by how much absorbing material covers it. A small, absorptive room rings briefly while a large hard room rings for seconds, guiding all acoustic treatment choices.
Formula
Room Reverberation Time
RT60 = 0.161 x volume / (surface area x absorption)
- absorption
- How much of the sound energy surfaces soak up
Worked example
With the default values below, Room Reverberation Time returns RT60 Reverb Time of 0.41. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Room lengthminimum 0.1 m
- 6 m
- Room widthminimum 0.1 m
- 4 m
- Room heightminimum 0.1 m
- 2.7 m
- Average absorptionaccepts 1–95 %
- 25 %
Results
- RT60 Reverb Time
- 0.41 s
- Room Volume
- 64.8 m³
- Surface Area
- 102.0 m²
Step by step
- 1Values used
- 2Room Reverberation Time
- 3RT60 Reverb Time= 0.41 s
- 4Room Volume= 64.8 m³
- 5Surface Area= 102.0 m²
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Room Reverberation Time calculated?
RT60 = 0.161 x volume / (surface area x absorption) Sabine's equation relates reverb time to the room's size divided by how much absorbing material covers it.
Why does Room Reverberation Time matter?
A small, absorptive room rings briefly while a large hard room rings for seconds, guiding all acoustic treatment choices.
What values do I need to enter?
This calculator takes 4 inputs: Room length, Room width, Room height, Average absorption. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.