RT60 and Acoustic Panel Requirement Calculator

Calculates how "live" or "dead" your room is using the Sabine formula, and tells you how many square meters of acoustic panels you need to reach your target value.

Room Dimensions

Existing Surfaces

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RT60 by Frequency

Method and Limitations

The calculation is based on the formula RT60 = 0.161 × V / A developed by Wallace Clement Sabine in 1898; where V is the room volume (m³) and A is the total sound absorption amount (sabins). Total absorption is the sum of the products of each surface's area and that material's frequency-dependent absorption coefficient.

Honest limitations: The Sabine formula assumes absorption is distributed homogeneously throughout the room. It can deviate from actual values when absorptive materials are concentrated on a single wall or when the room is very absorptive (RT60 < 0.3 s or so) — under these conditions the Eyring formula gives more accurate results. Additionally, the material coefficients used are typical values from the literature; your actual product's coefficient varies by manufacturer. This tool provides a starting point; for definitive results we recommend measuring with software such as REW.

To see your room's bass region problems: Room Mode Calculator →
To find where to place panels: First Reflection Points →