Singapore Workplace Noise Exposure Calculator
Estimate workplace noise exposure, compare against Singapore’s permissible exposure limits for noise, and support planning for noise control, hearing conservation and formal monitoring.
Workplace noise exposure depends on both sound level and exposure duration.
A short exposure to very high noise may create the same or greater risk than a longer exposure to lower noise. This calculator helps users estimate permissible exposure duration, daily equivalent exposure and combined exposure from multiple noisy tasks.
Check permissible duration and dose
Enter a noise level and exposure duration to estimate the maximum exposure duration and percentage noise dose using the Singapore noise exposure limit approach.
Estimate daily exposure
Combine several tasks across a workday and estimate the 8-hour equivalent sound pressure level and percentage noise dose.
Plan control actions
Explore how reducing noise level or exposure duration may help bring exposure below the permissible limit.
A practical sequence for workplace noise exposure assessment.
The calculator supports preliminary review. Formal assessment should be based on representative measurements, suitable instruments and a clear understanding of the work pattern.
Identify noisy tasks
List noisy machinery, processes, areas and work activities that may expose workers to excessive noise.
Measure sound levels
Use suitable calibrated instruments to measure representative A-weighted sound pressure levels.
Record duration
Estimate or measure how long workers spend at each noise level during the workday.
Calculate exposure
Combine task noise levels and durations to estimate daily equivalent exposure and noise dose.
Control and review
Prioritise engineering controls, exposure duration reduction, hearing conservation and repeat monitoring.
Noise Exposure Calculator
Use the calculator below to estimate permissible exposure duration, daily equivalent exposure and combined exposure from multiple tasks. Values are for preliminary reference only.
Noise level to maximum duration and dose
At 94 dB(A), the estimated maximum exposure duration is approximately 1 hour.
For an actual exposure duration of 1 hour, the estimated noise dose is 100%.
Review exposure controlDuration to equivalent permissible level
For 2 hours of exposure, the equivalent permissible sound pressure level is approximately 91 dB(A).
Use as planning referenceMultiple task daily exposure calculator
Enter each task, its representative dB(A) level and duration. The calculator estimates 8-hour equivalent exposure and percentage noise dose.
| Task / Area | Noise Level dB(A) | Hours | Minutes | Action |
|---|---|---|---|---|
Estimated 8-hour equivalent exposure: 91.5 dB(A). Estimated noise dose: 456%.
Dominant contributor: Grinding.
Likely exceeds permissible exposure limitReference table based on 85 dB(A) for 8 hours
The table uses the 3 dB exchange-rate relationship that aligns with the Singapore schedule around 85 dB(A) for 8 hours. Always check the current First Schedule before making formal compliance decisions.
| Noise Level dB(A) | Estimated Maximum Duration | Equivalent Hours | Dose for 1 Hour Exposure |
|---|
The tool estimates noise dose using the relationship between sound level and exposure duration.
The calculator uses 85 dB(A) for 8 hours as the reference point. Each 3 dB increase represents a doubling of acoustic energy and approximately halves the permissible duration.
Noise level to maximum duration
The calculator estimates the maximum duration using: Duration in hours = 8 × 2^((85 − L) / 3), where L is the A-weighted sound pressure level in dB(A).
Multiple task daily exposure
For multiple tasks, the calculator estimates dose by adding the fraction of allowed exposure used by each task. It also estimates Leq,8h using acoustic energy summation.
The calculator is not a replacement for workplace noise monitoring.
Formal noise monitoring may be required where workers are exposed or likely to be exposed to excessive noise. A company must submit a noise monitoring report to MOM if there are 10 or more people likely to be exposed to excessive noise.
Noise monitoring
Monitoring should be carried out by competent persons using appropriate sound level meters, noise dosimeters or other suitable calibrated instruments.
Hearing conservation
Exposure assessment should support hearing protector selection, worker training, audiometric examination and hearing conservation programme review.
Noise control
Priority should be given to engineering and administrative controls, such as quieter equipment, isolation, barriers, enclosures, maintenance and exposure duration reduction.
Use this calculator as a screening and planning tool only.
Noise exposure assessment can be affected by fluctuating work patterns, impact noise, worker movement, instrument settings, measurement location and representativeness of the monitoring period.
Not a measurement
The tool does not measure noise. It only calculates from values entered by the user.
Requires representative data
Inputs should be based on representative measurements, not assumptions or uncalibrated readings.
Peak noise not assessed
The calculator does not assess peak dB(C). Separate peak noise evaluation may be required.
Professional judgement needed
Formal decisions should be made by competent occupational hygiene or workplace noise professionals.
Primary references used for this page.
This page is a practical web adaptation for preliminary workplace noise exposure planning. It should be read together with the current Singapore legislation and MOM guidance.
Singapore Statutes Online: Workplace Safety and Health (Noise) Regulations 2011, First Schedule, Permissible Exposure Limits for Noise. Open First Schedule.
MOM guidance: MOM summarises the permissible exposure limit for noise as 85 dB(A) over an 8-hour workday or a peak sound pressure level exceeding 140 dB(C). Open MOM PEL explanation.
MOM noise monitoring report guidance: MOM states that a company must submit a noise monitoring report if there are 10 or more people likely to be exposed to excessive noise. Open MOM noise monitoring FAQ.
Professional note: This calculator does not replace formal workplace noise monitoring, calibrated measurements, personal noise dosimetry, hearing conservation programme review or competent professional interpretation.
Need help with workplace noise monitoring or exposure assessment?
IEH provides workplace noise monitoring, personal noise dosimetry, noise mapping, hearing conservation programme support and practical noise control recommendations.