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Calculating Noise Dose from LEQDate: June 05, 2019

Example below:

1. Leq/Lavg measured &
2. Exposure Duration (T)
to get the Noise Dose calculation.

Noise Dose Calculator

(Criteria Level = 85 dB, Exchange Rate = 3 dB, Threshold = none/80 dB)

Leq/Lavg (dBA)ExpDuration (hr)NoiseDose (%)TWA(dBA)

(Reference: MOM Noise monitoring reports submission)


Noise dose (D) is used as an indication of a percentage of the permissible noise exposure limit.

It is defined as the sum of fraction of exposure time at specific sound pressure level (ti) to the permissible exposure time (Ti) at that level.

Dose is expressed as a percentage of a maximum permissible daily exposure to noise. The sum of the fractions is the noise dose expressed in % with 100% being the permissible criterion sound level.


The permissible exposure time (T) in hours is related to the exposure sound pressure level (SPL) by the following formula.

*source: WSHC (2013) Workplace Safety and Health Guidelines - Statutory Medical Examination.


Further readings about Leq and Lavg, "A practical comparison of occupational noise standards - TINGAY and ROBINSON, 2014, Inter-noise 2014"


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