Reverberation Time (RT60) Calculator

Your details

Interior dimension from front wall to rear wall.
m
Interior dimension from left wall to right wall.
m
Floor-to-ceiling clearance.
m
Sabine is the classic formula, accurate when absorption is low. Eyring is more accurate for rooms with heavy absorption (studios, home theaters).
Sets the recommended RT60 target range shown alongside your result.
Each upholstered seat adds about 0.44 m2 (4.7 ft2) of equivalent absorption at 500 Hz.
seats
Number of standard windows (~1.5 m x 1.2 m each or ~5 ft x 4 ft).
Any additional absorption not covered above (e.g. bass traps, acoustic panels). Enter the equivalent absorption area.
m²
RT60 (reverberation time)On target
0.52s

Time for sound to decay 60 dB after the source stops

RT60 - Eyring formula0.45s
Total absorption (A)44.45
Room volume144
Average absorption coefficient0.247
Target RT60 (low)0.4s
Target RT60 (high)0.7s
0.52 s
Very dry<0.4Studio / speech0.4-0.8Speech / music0.8-1.4Concert music1.4-2.2Too reverberant2.2+

RT60 is 0.52 s

  • Your RT60 of 0.52 s is within the recommended range of 0.40-0.70 s. The room should perform well acoustically for its intended purpose.
  • Total acoustic absorption in the room is approximately 44.4 m² (Sabine units). Doubling this value would roughly halve the reverberation time.
  • Classrooms typically aim for RT60 between 0.4 s and 0.7 s at mid-frequencies (500 Hz).

Next stepTo fine-tune RT60: target frequency-specific absorption. Bass traps control the 125-250 Hz range; mid-frequency panels address 500-2000 Hz.

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