Noise Exposure Calculator

Calculate daily and weekly noise exposure (LEP,d and LEP,w) against the legal limits under the Control of Noise at Work Regulations 2005 (SI 2005/1643). All formulas sourced from HSE noise-exp-calc.xlsx V5-2.

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Task / activityLAeq dB(A)HrsMins

pts/hr 249.4→LEAV 00:08→UEAV 00:24pts 41.6

pts/hr 24.9→LEAV 01:16→UEAV 04:01pts 49.9

LAeq is the equivalent continuous A-weighted sound pressure level during the task. Use measured values or HSE reference noise levels where available.

Daily exposure (unprotected)

84.6dB(A) LEP,d

91.4exposure points

At or above LEAV. Warning: At or above LEAV. Control measures required. Hearing protection must be available.

0LEAVUEAVELV200 pts

Threshold	dB(A)	Points
LEAV	80	31.62
UEAV	85	100
ELV	87	158.49

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Hearing protector details

Protector name (optional)

H (dB)

M (dB)

L (dB)

TaskLAeqLCeqHrsMinsHP worn

PNR 22.5 dBear: 81.5 dB(A)⚠ under-protection riskpts 5.6

PNR 24.0 dBear: 75.0 dB(A)pts 2.5

LCeq is the C-weighted average level — not the peak (LCpeak). LCpeak is typically 20 dB or more higher. Enter LCeq here. The +4 dB real-world correction is applied automatically (HSE mandatory).

Daily exposure (protected)

74.1dB(A) LEP,d

8.1exposure points

Below ELV. Information: Noise at the ear below ELV. Use EAV calculator to compare with LEAV and UEAV.

0ELV 158.49300 pts

Threshold	dB(A)	Points
ELV	87	158.49

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Compare to:

Input unit:

DayDaily LEP,d dB(A)Daily points

Sunday—

Monday—

Tuesday—

Wednesday—

Thursday—

Friday—

Saturday—

Weekly averaging is appropriate where daily exposure on one or two days is at least 5 dB higher than other days, or where the working week has three or fewer noise- exposed days (SI 2005/1643, guidance).

Weekly exposure (EAV mode)

—dB(A) LEP,w

—weekly points

Enter daily noise exposure values to calculate weekly exposure.

0LEAVUEAV1000 pts

Threshold	dB(A)	Weekly pts
LEAV	80	158
UEAV	85	500
ELV	87	792

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How does this work? Read the full guide →New to occupational exposure? Start here →

This calculator is provided for guidance only. Results are based on formulas from HSE noise-exp-calc.xlsx V5-2 (August 2025). The calculator is not a substitute for a formal noise assessment carried out by a competent person. Employers must assess and control noise exposure under SI 2005/1643.