// multi-utility computation suite · offline · instant · precise
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sci.modal-decay-time Calculator
Calculates room mode decay time from surface absorption at each modal frequency using Schroeder's theory and modal density. Room modes cause bass frequency unevenness in small rooms — above the Schroeder frequency, statistical room acoustics apply.
Inputs
Room Volume M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Total Absorption M2
Reference formula or conversion factor shown for context.
Frequency Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
RT60 reverberation time (s)
The proportional relationship between two quantities.
modal density (modes/Hz)
The most frequently occurring value.
Schroeder frequency (Hz)
Sample size or count used in the calculation.
below Schroeder
Reference formula or conversion factor shown for context.