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HAVS exposure points & A(8)

Job / reference: ______________________________Printed date: ____

Formula registry version 1.0.0 · researched 2026-07-24 · effective threshold basis 2005-07-06

TL-06 · Exposure & health

Combine the declared vibration magnitude and trigger time for two tools. The calculation uses trigger time, not shift length.

Entered exposure data

△ Live calculation unavailable

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points = Σ(2 × aᵢ² × Tᵢ)

A(8) = √(Σ(aᵢ² × Tᵢ) ÷ 8)

Worked vector: 5 m/s² × 2 h plus 10 m/s² × 0.5 h = 200 points; A(8) = 3.536 m/s².

Tool / magnitude / trigger time:

Sum of a² × T:

Points / A(8):

Result recordSTATUTORY EXPOSURE CALCULATION

Worked example — default entered values

200 points

3.536 m/s² A(8)

above the exposure action value (EAV)

0EAV 100ELV 400

Assumptions register

Tool 1: 5 m/s² × 2 h trigger time · Tool 2: 10 m/s² × 0.5 h trigger time

Trigger time is used; shift length is not used.

Planning aid. This calculation does not replace competent-person assessment, manufacturer instructions or HSE guidance.

Source register · registry version 1.0.0

Health and Safety Executive, Hand-arm vibration at work — accessed 2026-07-24

UK Government, The Control of Vibration at Work Regulations 2005 — effective 2005-07-06 — accessed 2026-07-24

Formula researched 2026-07-24 · effective threshold basis 2005-07-06