RT60 Reverberation Calculator

Compute Sabine and Eyring reverberation times based on room absorption (Maker Label Studio)

1. Room Configuration

Tip: You can manually set the total volume and surface area. Ensure that your actual room dimensions accurately match these totals for precise Eyring calculations.

2. Surfaces & Treatments

Name Type Area 125 Hz 250 Hz 500 Hz 1k Hz 2k Hz 4k Hz Action

* Base surfaces represent the existing room. Treatment surfaces represent added acoustic materials (these add pure absorption without modifying the total structural surface area calculation).

3. RT60 Results (Seconds)

Frequency Band Total Absorption (A) Sabine RT60 (Base) Sabine RT60 (Total) Eyring RT60 (Base) Eyring RT60 (Total)

About the RT60 Reverberation (Sabine/Eyring) Calculator

An RT60 reverberation calculator enables acoustical consultants, architects, and studio designers to predict complex sound decay in enclosed spaces. By utilizing Sabine or Eyring equations across standard octave bands, you can effectively specify absorptive acoustic treatments to optimize human speech intelligibility and overall musical clarity.

How it works

  1. Define the room dimensions and intended usage.
  2. Apply specific absorption coefficients to the floor, walls, ceiling, and furnishings for each octave band.
  3. Analyze the calculated RT60 curve against target reverberation times to determine if additional acoustic panels are needed.

Frequently asked questions

What exactly does RT60 measure?

RT60 is the time it takes for sound pressure to decay by 60 decibels after the sound source has stopped. It is the primary metric for defining the reverberance of a room.

When should I use the Eyring equation instead of the Sabine equation?

The classic Sabine equation works well for live rooms with low absorption. The Eyring equation is more accurate for acoustically dead rooms like recording studios.

Why is RT60 calculated across different octave bands?

Materials absorb high frequencies differently than low frequencies. A room might have a short RT60 at 4kHz but suffer from muddy reverberation at 125Hz, requiring bass traps.

What is an ideal RT60 for a classroom?

For clear speech intelligibility, classrooms typically target a low RT60 of 0.4 to 0.6 seconds. Larger spaces like concert halls may target 1.5 to 2.0 seconds.

References