Use this calculation for a first-order acoustics estimate when the stated geometry, propagation model, averaging convention, reference quantity, and SI units match the measurement or design problem.

Length Meters

A finite measured or assumed value greater than or equal to 0, expressed in m.

Width Meters

A finite measured or assumed value greater than or equal to 0, expressed in m.

Height Meters

A finite measured or assumed value greater than or equal to 0, expressed in m.

The implemented rule is: Rectangular room volume from internal length, width and height.^[1]

Cubic Meters

The calculated cubic meters, expressed in m3.

This is an idealized calculation rather than a complete acoustic simulation or measurement. Reflections, boundary conditions, directivity, damping, frequency dependence, near-field behavior, background noise, transducer response, temperature, humidity, and geometry can change a real result.

Confirm important results with calibrated measurements or a model that includes the actual geometry, materials, boundaries, source directivity, and frequency-dependent losses. Preserve the reference quantity and weighting whenever a result is expressed in decibels.

• Room Mean Free Path

  Diffuse-field mean free path 4V/S inside a room from volume and total surface area.

• Axial Mode Frequency

  Rectangular-room axial mode frequency along one dimension for a positive integer mode order.

• Oblique Mode Frequency

  Rectangular-room mode frequency for three nonzero axial orders and dimensions.