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Reverb Time Calculator (RT60)
Calculate acoustic reverberation time based on room dimensions and surface materials.
Room Dimensions (Feet)
Surface Materials (@ 500 Hz)
Estimated Reverb Time (RT60)
0.00 s
Acoustic Rating: Ideal
Room Acoustics Preview
Volume: 0 cu ft
Volume
0 ft³
Surface Area
0 ft²
Sabins (A)
0
Avg Absorp (α)
0.00
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What is a Reverb Time (RT60) Calculator?
A Reverb Time Calculator is an acoustic engineering tool used to estimate the RT60 of a room. RT60 is the time it takes for a sound to decay by 60 decibels after the sound source stops. It helps designers and audio engineers understand whether a room will sound "live" (echoey) or "dead" (dry), allowing them to specify the correct amount of acoustic treatment for studios, home theaters, or auditoriums.
How to Assess Room Acoustics
3 Easy Steps
From dimensions to sound clarity.
1
Determine Volume
Measure the length, width, and height of the room. Larger volumes generally mean longer reverb times.
2
Identify Surfaces
Check the materials on your walls, floor, and ceiling. Hard surfaces reflect sound, while soft surfaces absorb it.
3
Calculate Sabins
The calculator multiplies surface areas by their absorption coefficients to find total absorption (Sabins).
The Math Behind the Calculator
Sabine's Formula
Developed by Wallace Clement Sabine in the late 1890s, this is the foundational equation of architectural acoustics.
RT60 (Imperial) = (0.049 × Volume) / Total Absorption (A)
Total Absorption (A) = Sum of (Surface Area × Coefficient α)
Where Volume is in cubic feet, and Area is in square feet. If using metric, the constant changes from 0.049 to 0.161.
What is the "Ideal" Reverb Time?
The perfect RT60 depends entirely on the room's purpose. For a home recording studio or home theater, you want a short reverb time (0.3 to 0.8 seconds) to ensure clear dialogue and tight monitoring.
However, for a concert hall designed for classical music, a longer reverb time (1.5 to 2.5 seconds) is desirable to allow the instruments to blend warmly and fill the space. A room with too much absorption will sound unnaturally "dead."
Related Calculators
Frequently Asked Questions
RT60 stands for "Reverberation Time 60." It is the measurement of the time it takes for a sound to decay, or drop in volume, by 60 decibels (dB) in a closed space after the sound source has stopped.
It varies by application. Classrooms and conference rooms need short times (0.6 - 1.0s) for speech clarity. Home studios prefer very short times (0.3 - 0.5s). Large churches or concert halls sound best with longer times (1.5 - 2.5s).
Reverb time is directly proportional to the volume of the room. As a room gets larger (higher ceilings, wider walls), the sound waves have further to travel before hitting a surface to be absorbed, leading to a longer decay time.
It is a value between 0 and 1 that represents how much sound a material absorbs. A coefficient of 0.05 (like drywall) means 5% of sound is absorbed, and 95% is reflected. A coefficient of 0.80 (acoustic foam) means 80% is absorbed.
An echoey or "live" room happens when there are too many hard, parallel surfaces (bare drywall, concrete floors, glass windows) with very low absorption coefficients. Adding soft furnishings, rugs, or acoustic panels solves this.
While the core physics remain the same, this specific calculator is calibrated for Imperial measurements (feet). If using metric (meters), the Sabine formula constant changes from 0.049 to 0.161.
Yes, significantly! A room full of people will have a much shorter reverb time than an empty room because bodies and clothing are highly absorptive. Couches and bookcases act similarly.
Sabine's formula calculates reverb time by stating that RT60 is proportional to the room's volume and inversely proportional to its total absorption. It works best in rooms with evenly distributed absorption materials.
User Reviews
James D.
Audio Engineer
"Helped me treat my home studio perfectly! Great to visually see the difference materials make."
Sarah M.
Home Theater Installer
"Great tool, wished it had a few more specific materials in the dropdowns."
Robert K.
First-time User
"A bit technical for a beginner, but the math seems solid after some research."
Emily C.
Acoustician
"Spot on estimates for our church hall renovation. Sabine's formula at work!"
David L.
Student
"Very useful for my audio engineering class project."
Lisa Peterson
Podcaster
"Saved me from buying too many acoustic panels. I realized my room was already pretty dead."
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