STUDIO MUSIC TOOLS
Free tool

Room Mode Calculator

Enter your room's length, width, and height to find every standing wave your room produces below 300 Hz — the range where small-room bass problems live.

Units: m (toggle below). Interior dimensions, wall to wall.

Room volume
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Room ratio (H:W:L)
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Reference only, not a pass/fail test.
Modes below 300 Hz
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Lowest mode
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Ratios roughly between 1:1.1:1.25 and 1:1.6:2.5 are commonly cited as tending to distribute modes more evenly (e.g. the Bolt area). This is a reference heuristic from room acoustics literature, not a guarantee — a "good ratio" room can still have real problems, and a "bad ratio" room can be treated successfully.

Room shape

Mode frequency graph

300 Hz

Each marker is a calculated resonant frequency of this room (a room mode) — not a measured sound level. Height only separates overlapping markers for readability. Click or tap a marker: axial modes jump to their standing-wave shape below, tangential/oblique modes jump to their row in the full table.

Mode density by band

count of modes per 20 Hz band

How many resonances fall in each 20 Hz slice below 300 Hz. Tall bars mean several modes stacked close together (likely reinforced/boomy); empty gaps mean no resonance support in that range.

Standing wave shape

Theoretical pressure pattern for this single mode only (ignores every other mode and any furniture/absorption) — a simplified picture of the standing wave shape, not a prediction of your room's full measured response.

FrequencyIndices (nx,ny,nz)Type

Want a full treatment plan from these numbers?

The Studio Acoustic Toolkit turns this calculation into bass trap counts, panel counts, and a priority order for what to buy first.

See the Studio Acoustic ToolkitOr get a human review