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Calcimator

Reverb Time (RT60) Calculator

Calculate room reverberation time using the Sabine and Eyring formulas. Determine if a room is suitable for recording, performance, or speech.

Inputs

m³
m²

Results

RT60 (Sabine)

0.64 s

RT60 (Eyring)0.58 s
RT300.32 s
Early Decay Time0.45 s
Mean Free Path3.2 m
Reverb CharacterModerate — lecture hall, living room
Ideal UseRecording studio, classroom, conference room

RT60 (Sabine)

0.64 s

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Room Volume — Total volume of the room in cubic meters. Typical living room is 40-80 m³; concert hall is 10,000-30,000 m³. Accepts values from 1 m³ to 100,000 m³ (default: 200 m³).
  3. Total Surface Area — Total interior surface area (walls + floor + ceiling) in square meters. Accepts values from 1 m² to 50,000 m² (default: 250 m²).
  4. Average Absorption Coefficient — Average absorption coefficient of all surfaces (0 = fully reflective, 1 = fully absorptive). Concrete ~0.02, carpet ~0.3, acoustic panels ~0.8. Accepts values from 0.01 to 0.99 (default: 0.2).
  5. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  6. RT60 (Sabine) — shown as a numeric value. This is the primary result of this calculator.
  7. RT60 (Eyring) — shown as a numeric value.
  8. RT30 — shown as a numeric value.
  9. Early Decay Time — shown as a numeric value.
  10. Mean Free Path — shown as a numeric value.
  11. Reverb Character — your calculated result.
  12. Ideal Use — your calculated result.
  13. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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