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That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
That day's daily personal noise exposure, or zero for a day not worked.
Each day's LEP,d, worked out from the tasks of that day on the daily exposure page or taken from a dosimeter. Leave a day at zero if no work was done on it: it then contributes nothing, and the week is still divided by five, which is how the regulations define the weekly figure.
Weekly personal noise exposure, LEP,w
86 dB(A)
86.0 dB(A) over the week is at or above the upper exposure action value of 85 dB(A), and below the 87 dB(A) exposure limit value. Where the weekly figure is used in the EU, the conditions attached include that it does not exceed 87 dB(A), and the loud days still carry the controls their own daily figures call for. Each of these regulations requires the risk from noise to be reduced at every level, so no figure here is a finding that the noise is acceptable.
- Days worked
- 5 days
- Loudest day, Monday
- 92 dB(A)
- The loudest day's share of the week's noise energy
- 79.85 %
- Loudest day minus the weekly figure
- 6.01 dB
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Weekly Noise Exposure (LEP,w) Calculator: 85.99 dB(A) — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Control of Noise at Work Regulations 2005, Schedule 1, Part 2: LEP,w = 10 log10[(1/5) × Σ 10^(0.1 × (LEP,d)k)], summed over the working days k of the week — divided by five whatever the number of days worked
- Control of Noise at Work Regulations 2005, regulation 4(6): where exposure varies markedly from day to day, weekly personal noise exposure may be used in place of daily; Directive 2003/10/EC, Article 3(3), allows the same on condition that the weekly level shown by monitoring does not exceed the 87 dB(A) exposure limit value and that the risk from the noisy work is reduced to a minimum
Inputs used
- Monday LEP,d (dB(A), 0 if not worked)
- 92
- Tuesday LEP,d (dB(A), 0 if not worked)
- 80
- Wednesday LEP,d (dB(A), 0 if not worked)
- 80
- Thursday LEP,d (dB(A), 0 if not worked)
- 80
- Friday LEP,d (dB(A), 0 if not worked)
- 80
- Saturday LEP,d (dB(A), 0 if not worked)
- 0
- Sunday LEP,d (dB(A), 0 if not worked)
- 0
Intermediate steps
- Days worked
- 5 days
- Loudest day, Monday
- 92 dB(A)
- The loudest day's share of the week's noise energy
- 79.85 %
- Loudest day minus the weekly figure
- 6.01 dB
Confidence note: 86.0 dB(A) over the week is at or above the upper exposure action value of 85 dB(A), and below the 87 dB(A) exposure limit value. Where the weekly figure is used in the EU, the conditions attached include that it does not exceed 87 dB(A), and the loud days still carry the controls their own daily figures call for. Each of these regulations requires the risk from noise to be reduced at every level, so no figure here is a finding that the noise is acceptable.
What this calculation does not cover
- It averages daily figures you already have. Each must be a full LEP,d worked out the same way — from the tasks of that day, normalised to 8 hours — or the week is an average of unlike things.
- Peak sound pressure is judged event by event and is never averaged over a week; one loud impulse is not diluted by quiet days.
- The weekly figure is permitted only where exposure varies markedly from day to day, and in the EU only with the conditions attached; whether it is appropriate for a particular job is the employer's assessment, not this arithmetic's.
- Averaging over a week describes the dose; it does not change what happens to hearing on the loud day, and the controls for that day are the ones the daily figure asks for.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-21 · v1.0.0
Regulatory standards & verification citations2
- Control of Noise at Work Regulations 2005, Schedule 1, Part 2: LEP,w = 10 log10[(1/5) × Σ 10^(0.1 × (LEP,d)k)], summed over the working days k of the week — divided by five whatever the number of days worked
- Control of Noise at Work Regulations 2005, regulation 4(6): where exposure varies markedly from day to day, weekly personal noise exposure may be used in place of daily; Directive 2003/10/EC, Article 3(3), allows the same on condition that the weekly level shown by monitoring does not exceed the 87 dB(A) exposure limit value and that the risk from the noisy work is reduced to a minimum
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