Room Reverberation Time (RT60) Estimator
Predict how long sound lingers in a room by combining dimensions with surface absorption. Enter the length, width, height, an average absorption coefficient, and choose Sabine (0) or Eyring (1) to calculate RT60 in seconds.
CalcSimpler Examples
- 8×5×3 m room, α=0.20, Sabine ⇒ 0.61 seconds
- 12×7×4 m room, α=0.35, Eyring ⇒ 0.39 seconds
FAQ
When should I use the Eyring formula?
Use Eyring for highly absorptive rooms (α > 0.3) where Sabine tends to under-predict decay time.
What if surfaces have different materials?
Calculate a weighted average absorption coefficient based on each surface area and material coefficient.
Does RT60 vary by frequency?
Yes. This calculator provides a broadband estimate; measure octave bands for detailed acoustic design.
Additional Information
- Sabine uses RT60 = 0.161 × Volume / (Absorption Area).
- Eyring adjusts for rooms with high absorption by using a logarithmic term.
- Ensure dimensions are in metres so the constant 0.161 remains valid.
CalcSimpler