What are the ideal room ratios for a studio?

The Bolt area recommends ratios of approximately 1 : 1.14-1.39 : 1.39-1.73 (height : width : length normalised to height = 1). Other recommended ratios include 1:1.28:1.54 and 1:1.6:2.33. Avoid integer ratios (1:1, 1:2, 2:3) which cause coincident modes.

Room modes are resonant frequencies determined by room dimensions. Axial modes (between two parallel surfaces) are the strongest. The first axial mode frequency for each dimension is: f = speed of sound / (2 × dimension). Modes cause peaks and nulls in bass response at specific positions.

Can I fix bad room ratios with treatment?

Acoustic treatment (bass traps, diffusers) can significantly reduce the severity of modal problems but cannot eliminate them entirely. Starting with good proportions and adding treatment is far better than trying to treat a poorly proportioned room. Treatment is essential regardless of ratios.

What room size is best for a home studio?

Larger rooms have lower first mode frequencies and more evenly distributed modes. A minimum of 30-40 cubic metres is recommended. Below 20 cubic metres, low-frequency problems become severe. If your room is small, focus on nearfield monitoring and heavy bass trapping.

AudioCalcs

Room Dimension Calculator — Modal Distribution Check

Check room dimension ratios against recommended values for even modal distribution.

Length

Width

Height

How We Calculate This

Room Ratios

Dimensions are normalised to the smallest dimension (typically height) and compared against the Bolt area for acceptable ratios.

Axial Modes

f = c / (2 × dimension)

Where c = 343 m/s (speed of sound at 20°C). Higher-order modes are integer multiples of the first mode.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates based on standard formulas. Always verify results for critical applications.