Impact wrench HAVS calculator One worker’s estimated daily hand-arm vibration exposure across all their tools.
- Free, no account
- 100 points after 30 min to 2 hours on HSE’s figures
- Nothing is stored
Only the time the tool is running in their hands. Breaks add up, they do not reset it.
Not counted yet: type not chosen.
Daily exposure
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Not counted yet: Impact wrench (type not chosen).
About this estimate
Based on HSE-published data (HSE, Vibration risk assessment, Table 1 "Some typical vibration levels for common tools", read 16 September 2026) and, for a named make and model, the figure its maker declares in its manual or product information. HSE and the makers have not reviewed or endorsed this calculator. An estimate to support an exposure assessment, not a measurement, a risk assessment or a compliance certificate.
Impact wrench vibration by drive size
HSE publishes 2 figures for impact wrenches, one for each type below.
| Type | 100 points after | 400 points after |
|---|---|---|
| 3/8, 1/2 and 3/4 inch drive 5 m/s², range 3 to 6 | 2 hours | 8 hours |
| 1 inch drive 10 m/s², range 7 to 11 | 30 min | 2 hours |
An hour on an impact wrench is 50 to 200 points
Points are 2 × vibration² × hours of trigger time: 50 an hour at 5 m/s², 200 at 10 m/s². Every other tool that person uses adds to the same day. If you have the impact wrench’s own figure from its handbook or a measurement, enter that instead.
| Daily exposure | What the employer must do |
|---|---|
| Under 100 points | Keep exposure as low as you reasonably can. Workers who already have symptoms still need protecting. |
| 100 points Action value, 2.5 m/s² A(8) | Reduce exposure, and give training and health checks to those regularly exposed. |
| 400 points Limit value, 5 m/s² A(8) | Cut exposure at once, find out why, and change the work so it does not happen again. |
Sources
- HSE, Vibration risk assessment and tool figures
- HSE, Hand-arm vibration advice for employers
- HSE, INDG175: Hand-arm vibration at work
- Control of Vibration at Work Regulations 2005
Figures for other tools: HAVS chart for common tools. HSE has not reviewed or endorsed this calculator.