atuund

Room Mode Calculator

Calculate the standing waves and resonant frequencies in your room. Works with any room shape — not just rectangles.

Room dimensions

Axial

19

Tangential

81

Oblique

85

Mode distribution (20–300 Hz)

20 Hz100 Hz200 Hz300 Hz

185 modes

33.1 Hz(0, 1, 0)
axial
46.9 Hz(1, 0, 0)
axial
57.4 Hz(1, 1, 0)
tangential
66.2 Hz(0, 2, 0)
axial
70.3 Hz(0, 0, 1)
axial
77.7 Hz(0, 1, 1)
tangential
81.1 Hz(1, 2, 0)
tangential
84.5 Hz(1, 0, 1)
tangential
90.8 Hz(1, 1, 1)
oblique
93.8 Hz(2, 0, 0)
axial
96.6 Hz(0, 2, 1)
tangential
99.3 Hz(0, 3, 0)
axial
99.4 Hz(2, 1, 0)
tangential
107.4 Hz(1, 2, 1)
oblique
109.8 Hz(1, 3, 0)
tangential
114.8 Hz(2, 2, 0)
tangential
117.2 Hz(2, 0, 1)
tangential
121.7 Hz(0, 3, 1)
tangential
121.8 Hz(2, 1, 1)
oblique
130.4 Hz(1, 3, 1)
oblique
132.4 Hz(0, 4, 0)
axial
134.6 Hz(2, 2, 1)
oblique
136.6 Hz(2, 3, 0)
tangential
140.4 Hz(1, 4, 0)
tangential
140.7 Hz(0, 0, 2)
axial
140.7 Hz(3, 0, 0)
axial
144.5 Hz(0, 1, 2)
tangential
144.5 Hz(3, 1, 0)
tangential
148.3 Hz(1, 0, 2)
tangential
149.9 Hz(0, 4, 1)
tangential
151.9 Hz(1, 1, 2)
oblique
153.6 Hz(2, 3, 1)
oblique
155.5 Hz(0, 2, 2)
tangential
155.5 Hz(3, 2, 0)
tangential
157.1 Hz(1, 4, 1)
oblique
157.3 Hz(3, 0, 1)
tangential
160.7 Hz(3, 1, 1)
oblique
162.2 Hz(2, 4, 0)
tangential
162.4 Hz(1, 2, 2)
oblique
165.5 Hz(0, 5, 0)
axial
169.1 Hz(2, 0, 2)
tangential
170.6 Hz(3, 2, 1)
oblique
172.0 Hz(1, 5, 0)
tangential
172.2 Hz(0, 3, 2)
tangential
172.2 Hz(3, 3, 0)
tangential
172.3 Hz(2, 1, 2)
oblique
176.8 Hz(2, 4, 1)
oblique
178.5 Hz(1, 3, 2)
oblique
179.8 Hz(0, 5, 1)
tangential
181.6 Hz(2, 2, 2)
oblique
185.8 Hz(1, 5, 1)
oblique
186.0 Hz(3, 3, 1)
oblique
187.6 Hz(4, 0, 0)
axial
190.2 Hz(2, 5, 0)
tangential
190.5 Hz(4, 1, 0)
tangential
193.2 Hz(0, 4, 2)
tangential
193.2 Hz(3, 4, 0)
tangential
196.1 Hz(2, 3, 2)
oblique
198.6 Hz(0, 6, 0)
axial
198.8 Hz(1, 4, 2)
oblique
198.9 Hz(4, 2, 0)
tangential
198.9 Hz(3, 0, 2)
tangential
200.3 Hz(4, 0, 1)
tangential
201.7 Hz(3, 1, 2)
oblique
202.8 Hz(2, 5, 1)
oblique
203.0 Hz(4, 1, 1)
oblique
204.0 Hz(1, 6, 0)
tangential
205.6 Hz(3, 4, 1)
oblique
209.7 Hz(3, 2, 2)
oblique
210.7 Hz(0, 6, 1)
tangential
211.0 Hz(4, 2, 1)
oblique
211.0 Hz(0, 0, 3)
axial
212.2 Hz(4, 3, 0)
tangential
213.6 Hz(0, 1, 3)
tangential
214.7 Hz(2, 4, 2)
oblique
215.8 Hz(1, 6, 1)
oblique
216.1 Hz(1, 0, 3)
tangential
217.2 Hz(0, 5, 2)
tangential
217.2 Hz(3, 5, 0)
tangential
218.7 Hz(1, 1, 3)
oblique
219.6 Hz(2, 6, 0)
tangential
221.1 Hz(0, 2, 3)
tangential
222.2 Hz(1, 5, 2)
oblique
222.3 Hz(3, 3, 2)
oblique
223.6 Hz(4, 3, 1)
oblique
226.1 Hz(1, 2, 3)
oblique
228.3 Hz(3, 5, 1)
oblique
229.6 Hz(4, 4, 0)
tangential
230.6 Hz(2, 6, 1)
oblique
230.9 Hz(2, 0, 3)
tangential
231.7 Hz(0, 7, 0)
axial
233.2 Hz(0, 3, 3)
tangential
233.3 Hz(2, 1, 3)
oblique
234.4 Hz(4, 0, 2)
tangential
234.4 Hz(5, 0, 0)
axial
236.4 Hz(1, 7, 0)
tangential
236.6 Hz(2, 5, 2)
oblique
236.8 Hz(4, 1, 2)
oblique
236.8 Hz(5, 1, 0)
tangential
237.9 Hz(1, 3, 3)
oblique
239.0 Hz(3, 4, 2)
oblique
240.1 Hz(4, 4, 1)
oblique
240.2 Hz(2, 2, 3)
oblique
242.1 Hz(0, 7, 1)
tangential
243.4 Hz(0, 6, 2)
tangential
243.4 Hz(3, 6, 0)
tangential
243.6 Hz(4, 2, 2)
oblique
243.6 Hz(5, 2, 0)
tangential
244.8 Hz(5, 0, 1)
tangential
246.6 Hz(1, 7, 1)
oblique
247.0 Hz(5, 1, 1)
oblique
247.8 Hz(1, 6, 2)
oblique
249.1 Hz(0, 4, 3)
tangential
249.9 Hz(2, 7, 0)
tangential
250.1 Hz(4, 5, 0)
tangential
251.3 Hz(2, 3, 3)
oblique
253.3 Hz(3, 6, 1)
oblique
253.5 Hz(1, 4, 3)
oblique
253.6 Hz(5, 2, 1)
oblique
253.6 Hz(3, 0, 3)
tangential
254.6 Hz(4, 3, 2)
oblique
254.6 Hz(5, 3, 0)
tangential
255.7 Hz(3, 1, 3)
oblique
258.8 Hz(3, 5, 2)
oblique
259.7 Hz(2, 7, 1)
oblique
259.8 Hz(4, 5, 1)
oblique
260.8 Hz(2, 6, 2)
oblique
262.1 Hz(3, 2, 3)
oblique
264.1 Hz(5, 3, 1)
oblique
264.8 Hz(0, 8, 0)
axial
266.2 Hz(2, 4, 3)
oblique
268.2 Hz(0, 5, 3)
tangential
268.9 Hz(1, 8, 0)
tangential
269.2 Hz(4, 4, 2)
oblique
269.2 Hz(5, 4, 0)
tangential
271.0 Hz(0, 7, 2)
tangential
271.0 Hz(3, 7, 0)
tangential
272.2 Hz(1, 5, 3)
oblique
272.3 Hz(3, 3, 3)
oblique
273.2 Hz(4, 6, 0)
tangential
273.4 Hz(5, 0, 2)
tangential
274.0 Hz(0, 8, 1)
tangential
275.1 Hz(1, 7, 2)
oblique
275.4 Hz(5, 1, 2)
oblique
277.9 Hz(1, 8, 1)
oblique
278.3 Hz(5, 4, 1)
oblique
280.0 Hz(3, 7, 1)
oblique
280.9 Hz(2, 8, 0)
tangential
281.1 Hz(3, 6, 2)
oblique
281.3 Hz(5, 2, 2)
oblique
281.3 Hz(0, 0, 4)
axial
281.3 Hz(6, 0, 0)
axial
282.1 Hz(4, 6, 1)
oblique
282.3 Hz(4, 0, 3)
tangential
283.3 Hz(0, 1, 4)
tangential
283.3 Hz(6, 1, 0)
tangential
284.1 Hz(2, 5, 3)
oblique
284.2 Hz(4, 1, 3)
oblique
285.2 Hz(1, 0, 4)
tangential
286.1 Hz(3, 4, 3)
oblique
286.8 Hz(2, 7, 2)
oblique
287.0 Hz(4, 5, 2)
oblique
287.0 Hz(5, 5, 0)
tangential
287.1 Hz(1, 1, 4)
oblique
289.0 Hz(0, 2, 4)
tangential
289.0 Hz(6, 2, 0)
tangential
289.6 Hz(2, 8, 1)
oblique
289.8 Hz(0, 6, 3)
tangential
290.0 Hz(4, 2, 3)
oblique
290.0 Hz(6, 0, 1)
tangential
290.9 Hz(5, 3, 2)
oblique
291.9 Hz(6, 1, 1)
oblique
292.8 Hz(1, 2, 4)
oblique
293.5 Hz(1, 6, 3)
oblique
295.5 Hz(5, 5, 1)
oblique
296.5 Hz(2, 0, 4)
tangential
297.4 Hz(6, 2, 1)
oblique
297.9 Hz(0, 9, 0)
axial
298.1 Hz(4, 7, 0)
tangential
298.3 Hz(0, 3, 4)
tangential
298.3 Hz(6, 3, 0)
tangential
298.4 Hz(2, 1, 4)
oblique
299.3 Hz(4, 3, 3)
oblique
299.8 Hz(0, 8, 2)
tangential
299.8 Hz(3, 8, 0)
tangential

Need non-rectangular room analysis?

The Atuund Workstation uses finite element analysis to compute modes for L-shaped rooms, rooms with alcoves, angled walls, and any geometry.

Want full room modeling, measurement, and optimization?

Try the Atuund Workstation

What are room modes?

Room modes are resonant frequencies caused by sound waves reflecting between parallel surfaces. At these frequencies, the reflected waves align to create standing wave patterns with fixed areas of high pressure (peaks) and low pressure (nulls). Every room has three types of modes: axial (between two parallel surfaces), tangential (involving four surfaces), and oblique (involving all six surfaces). Axial modes are the strongest and most problematic for bass reproduction.

Beyond rectangular room mode formulas

Most room mode calculators use the simple formula f = (c/2) × √((n₁/L)² + (n₂/W)² + (n₃/H)²), which only works for rectangular rooms. Atuund uses finite element method (FEM) analysis to compute modes for any room geometry — L-shaped rooms, rooms with alcoves, angled walls, and other irregular shapes. The FEM solver meshes your room into thousands of elements and solves the acoustic wave equation numerically.

What to do about problematic room modes

Once you know your room modes, the most effective solution is strategic speaker and listener placement. Positioning speakers and your listening seat away from mode pressure maxima reduces excitation of problematic frequencies. Bass traps at room boundaries can also absorb low-frequency energy, though placement matters significantly more than most people realize.

Frequently Asked Questions

How are room modes calculated?

For rectangular rooms, modes can be calculated analytically using the room dimensions and the speed of sound. For non-rectangular rooms, Atuund uses finite element analysis (FEM) — the room is divided into a 3D mesh of tetrahedral elements, and the acoustic eigenvalue problem is solved numerically to find resonant frequencies and their spatial patterns.

What frequency range matters for room modes?

Room modes are most significant below 200–300 Hz, where wavelengths are comparable to room dimensions. Above this range (the Schroeder frequency), modes overlap so densely that the room behaves more diffusely. Atuund analyzes modes from 20 Hz to 200 Hz, covering the critical bass region where placement has the most impact.

Are some room dimensions better than others?

Yes. Rooms where dimensions are multiples of each other (e.g., 10×20×10 ft) concentrate modes at the same frequencies, creating severe peaks. Ratios like 1:1.26:1.59 (Bolt area) spread modes more evenly. But even in a poorly-proportioned room, optimized speaker placement can dramatically improve the frequency response.

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Atuund uses finite element method (FEM) modal analysis to model room acoustics. Built for hi-fi enthusiasts, home theater builders, and anyone who wants better sound from their speakers.