Piano Room Acoustics Calculator

The calculator sets a much higher minimum volume for larger pianos — 1,200 cubic feet for uprights, 1,800 for baby grands, and 2,500 for concert grands — because a larger soundboard radiates more low-frequency energy, and an undersized room can't develop that bass response properly, leading to boomy or uneven bass no amount of panel treatment can fix. Volume, not floor area alone, is what the room-size check is based on.

Volume adequate checks whether your room's total cubic footage meets the minimum for your piano type, addressing overall bass development. Wall distance OK is a separate check on horizontal clearance from the piano's footprint to the nearest wall — grand pianos in particular radiate sound outward across a wide area and need real distance (3 feet for baby grands, 5 feet for concert grands) so nearby wall reflections don't color the tone, even in a room with plenty of overall volume.

Teaching rooms target the shortest RT60 (0.7s) because instructional clarity — being able to hear articulation and technique clearly — matters more than tonal bloom. Upright and baby grand practice targets 0.8s as a balanced middle ground, while concert grands target 1.2s because a bit more reverberant bloom flatters their fuller tone and larger dynamic range, which is more the point in performance-oriented spaces.

It first estimates your bare room's current absorption from the Sabine equation and a 0.05 surface absorption coefficient, then calculates the absorption needed to hit the target RT60 for your piano type and use. The difference between those two absorption totals is converted to square footage assuming NRC-0.7 panels, so a room that's already close to its target RT60 gets a small panel recommendation, while a large, hard-surfaced room gets a much bigger one.