Hand-Arm Vibration Exposure Calculator
Use this HAVS calculator to estimate daily hand-arm vibration exposure in A(8) and points, compare against the EAV (2.5 m/s²) and ELV (5.0 m/s²), and see clear warning levels for risk assessment.
This Hand-Arm Vibration (HAV) exposure calculator helps employers, supervisors, estimators, and workers estimate likely daily vibration exposure from up to six tools or processes. It uses the HSE points and A(8) approach under the Control of Vibration at Work Regulations 2005.
Pick a tool from the built-in starter library, or override the magnitude with your own measured or manufacturer value, then enter the trigger time. The calculator returns daily A(8), exposure points, time to EAV / ELV, and a clear warning level.
Note: This tool supports risk assessment. It does not replace competent judgement, measured vibration data, control measures, health surveillance decisions, or legal compliance steps.
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What this calculator does
Estimates daily hand-arm vibration exposure (A(8)) and exposure points across up to 6 tools or processes, with row-by-row partial exposure, time to EAV, time to ELV, and a clear warning band based on the HSE model.
Who it is for
UK employers, supervisors, safety managers, estimators, fabrication and site-work businesses, and workers wanting a quick check of likely daily HAV exposure to support risk assessment under the Control of Vibration at Work Regulations 2005.
How to use it
Pick a tool from the lookup library for each row (up to 6), or enter your own measured / manufacturer magnitude in m/s². Add the trigger time in hours and minutes for each row. Click 'See my result' for daily A(8), exposure points, time to EAV / ELV, and the warning band.
How the calculation works
For each row: selected magnitude = user override if entered, otherwise library default. Duration = hours + minutes/60. Partial A(8) = magnitude × √(duration / 8). Partial points = (magnitude / 2.5)² × (duration / 8) × 100. Daily A(8) = √(sum of partial A(8) squared). Daily points = sum of partial points. Time to EAV = (2.5 / magnitude)² × 8 hours. Time to ELV = (5 / magnitude)² × 8 hours.
Worked example
A fabricator uses an angle grinder (default 7 m/s²) for 45 minutes, a needle scaler — vibration reduced (7 m/s²) for 20 minutes, and a small impact wrench (5 m/s²) for 30 minutes. Partial A(8) values: grinder ≈ 2.1, scaler ≈ 1.4, wrench ≈ 1.3. Daily A(8) ≈ √(2.1² + 1.4² + 1.3²) ≈ 2.9 m/s². Daily points ≈ 131. Status: at or above EAV — action required to control exposure.
Assumptions and limitations
- Based on HSE points and A(8) approach under the Control of Vibration at Work Regulations 2005
- EAV = 2.5 m/s² A(8) = 100 points; ELV = 5.0 m/s² A(8) = 400 points
- Tool library values are starter HSE-style ranges (mid-point of each band) and should be reviewed against measured or manufacturer data
- Trigger time is hands-on time the tool is actively creating vibration, not the whole working day
- If a row has no magnitude or no duration, it is ignored
- User magnitude overrides the library value for that row only
- Time to EAV / ELV displays as hh:mm; values over 24 hours are shown as >24:00
- This is an estimate for risk assessment — not a measurement, not a compliance certificate, and not medical or legal advice
Frequently asked questions
What is HAVS?
Hand-Arm Vibration Syndrome (HAVS) is a permanent and disabling condition caused by long-term exposure to vibration from hand-held or hand-guided tools. It can cause vibration white finger, nerve damage, and reduced grip strength. HAVS is preventable but not curable.
What does A(8) mean?
A(8) is the daily vibration exposure normalised to an 8-hour reference period, in m/s². It lets you compare different tools and durations against the legal Exposure Action Value (2.5 m/s²) and Exposure Limit Value (5.0 m/s²).
What is the exposure action value for hand-arm vibration?
The Exposure Action Value (EAV) is 2.5 m/s² A(8), equivalent to 100 exposure points. Above the EAV, employers must take action to reduce exposure as low as reasonably practicable, provide information and training, and consider health surveillance.
What is the exposure limit value?
The Exposure Limit Value (ELV) is 5.0 m/s² A(8), equivalent to 400 exposure points. Daily exposure must not exceed the ELV under the Control of Vibration at Work Regulations 2005.
How do I work out vibration points?
Points per hour = (magnitude / 2.5)² × 100 / 8. For each tool, multiply points per hour by the trigger time in hours to get partial points. Total daily points are the sum across all tools used in the day. 100 points = EAV, 400 points = ELV.
What is trigger time?
Trigger time is the actual hands-on time the tool is creating vibration in the operator's hands — not the whole working day, and not setup, walking around, or rest breaks. Accurate trigger time is critical for a realistic A(8) estimate.
Do I need health surveillance for HAVS?
Where there is a likely risk of HAVS — typically when exposure is at or above the EAV — employers must provide health surveillance. This is a structured programme to detect early signs of HAVS so action can be taken before damage is permanent.
What happens if exposure is above the ELV?
If estimated daily exposure is above 5.0 m/s² A(8) (400 points), immediate action is required to reduce exposure. Options include shorter trigger times, switching to lower-vibration tools, job rotation, better tool maintenance, and reviewing the work method.
Can I use manufacturer vibration data?
Yes — and you should. Use the magnitude override field for any row where you have manufacturer or measured data, ideally based on real working conditions. Manufacturer 'declared' values can underestimate real exposure, so a safety margin is sensible.
Is this calculator the same as the HSE spreadsheet?
It uses the same model and formulas as the HSE points/A(8) spreadsheet, including the same warning bands. Always check current HSE guidance and verify against your own measured data and risk assessment.
Is HAVS reportable under RIDDOR?
Yes — diagnosed HAVS in employees can be reportable under RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations) as an occupational disease where it is connected to work activities.
Which tools usually create high vibration exposure?
Pneumatic hammers, demolition / rotary hammers, chipping hammers, needle scalers (non vibration-reduced), reciprocating saws, plate compactors, and rock drills are all high-vibration tools. Even short trigger times with these tools can push exposure over the EAV.
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Related guides
- Hand-Arm Vibration Exposure Explained (UK) — A plain-English UK guide to hand-arm vibration: what HAVS is, how A(8) and exposure points work, EAV / ELV thresholds, employer duties, and how to reduce risk.
Sources and references
HSE Hand-Arm Vibration calculator guide (https://www.hse.gov.uk/vibration/hav/calculator-guide.htm), HSE Employer responsibilities (https://www.hse.gov.uk/vibration/hav/responsibilities.htm), HSE Protect your workers (https://www.hse.gov.uk/VIBRATION/hav/protect.htm), HSE Regulations (https://www.hse.gov.uk/vibration/hav/regulations.htm), HSE Assess the risks (https://www.hse.gov.uk/vibration/hav/assessrisks.htm), HSE RIDDOR occupational diseases (https://www.hse.gov.uk/riddor/occupational-diseases.htm). Tool library values are starter values and should be reviewed if updated guidance changes.
Last updated
Last reviewed: 2026-04-19.