SoundPLAN Asia provides a suite of free online acoustic calculators for engineers, consultants, and safety professionals who need quick noise calculations without opening specialist software. These tools are useful for preliminary assessments, desktop studies, training exercises, and field checks. For full project-level noise mapping, SoundPLANnoise and SoundPLANmanda provide the rigour required for regulatory submissions.
Calculate the combined sound level from multiple noise sources using correct logarithmic addition. Enter each source level in dBA and get the total. Essential for understanding cumulative noise from equipment groups, traffic streams, or multiple industrial sources.
Calculate a worker's daily noise exposure level (LEX,8h) from one or more tasks of different durations and noise levels. Determines whether exposure exceeds the 80 dBA lower action value or 85 dBA upper action value. Based on ISO 9612 methodology.
Estimate how much noise attenuates with distance from a point source (6 dB per doubling of distance in free field) or a line source such as a road (3 dB per doubling). Accounts for basic ground attenuation. Useful for quick screening of noise sources relative to sensitive receptors.
Calculate the effective attenuation provided by a hearing protector using the SNR, HML, or octave band method (ISO 4869-2). Determines whether a proposed HPE is adequate for a given noise environment and estimates the noise level at the ear. Helps avoid both under-protection and over-protection.
These calculators are for screening and estimation only. When you need to produce regulatory-compliant noise level maps, strategic noise maps, or detailed worker exposure assessments for formal EIA or compliance reports, use SoundPLANnoise or SoundPLANmanda.
All calculators on this page run directly in your browser — no software installation, no login, and no data submission required. Enter your values using the input fields and the result updates automatically. Results are displayed with the relevant formula so you can verify the calculation manually if needed.
Online acoustic calculators are excellent for quick estimates and learning, but they cannot replicate the rigour of purpose-built noise modeling software. They do not account for terrain, building shielding, reflections, or multiple simultaneous noise sources. They cannot produce noise maps, contour lines, or regulatory-format reports. For any assessment that will be submitted to a regulator, project developer, or client — use SoundPLAN.
In addition to these calculators, SoundPLAN Asia provides free technical articles on noise assessment methodology, a noise measurement glossary, and downloadable product brochures and demo software. All free, no registration required.