Reverb Calculator
Calculate reverb time (RT60) for a room based on dimensions and surface absorption. Helps in acoustic design and soundproofing.
Published by:
isCalculator Editorial Team
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How to Use the Reverb Calculator
This tool estimates the RT60 reverb time (seconds for sound to decay 60 dB) using Sabine’s formula. All inputs must be in meters and the absorption coefficient between 0 and 1.
- Enter room dimensions – Input the Length, Width, and Height in meters (e.g., 10, 8, 3). Use decimals if needed.
- Set absorption – Provide the Average Absorption Coefficient (e.g., 0.2 for typical carpeted room). Values range from 0 (fully reflective) to 1 (fully absorbent).
- Calculate – Click the Calculate RT60 button. The result appears below in seconds (e.g., “0.85 s”).
- Review breakdown – The formula details show volume, surface area, and the full calculation for verification.
Tip: For accurate results, use metric units only. If your room has mixed surfaces, estimate an average absorption coefficient.
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Frequently Asked Questions
RT60 is the time required for sound to decay by 60 decibels after the source stops. It's a standard measure of reverberation.
Sabine's formula calculates RT60 as 0.161 * V / (S * α), where V is room volume, S is total surface area, and α is the average absorption coefficient.
Typical values: concrete 0.02, carpet 0.30, acoustic panels 0.80. The coefficient ranges from 0 (perfect reflection) to 1 (perfect absorption).