Free Tool
Enter your room dimensions and materials. Get an estimated acoustic score, reverberation time, room modes, and personalized fix recommendations — instantly.
This calculator uses the Sabine equation to estimate reverberation time (RT60) based on your room's dimensions and surface materials. RT60 is the time it takes for sound to decay by 60 decibels — the standard measure of how “echoey” a room sounds.
The formula is: RT60 = 0.161 × V / A, where V is the room volume in cubic meters and A is the total absorption in sabins (surface area × absorption coefficient for each material).
Room modes are calculated using the Rayleigh equation, which predicts the frequencies where standing waves form based on room dimensions. These are the bass frequencies that build up and make a room sound “boomy.”
It depends on the room. A home office or recording studio should be around 0.3–0.4 seconds. A living room is comfortable at 0.4–0.6 seconds. A kitchen or dining room can tolerate 0.5–0.7 seconds. Too high means echoes and poor speech clarity. Too low means the room feels dead and uncomfortable.
This calculator provides an estimate based on idealized conditions — it assumes uniform materials, no furniture, and simple rectangular geometry. Real rooms have furniture, doors, irregular shapes, and variable materials that affect acoustics. For an accurate measurement of your actual room, use the RoomTone app — it listens to how sound actually behaves in your space.