Free tool
Free HAVS calculator — HSE exposure points and A(8)
Add each vibrating tool a worker uses in a day with its vibration magnitude and trigger time. The calculator sums HSE exposure points using the official formula (2 × magnitude² × hours), shows the A(8) daily exposure, and checks it against the Exposure Action Value (100 points) and Exposure Limit Value (400 points).
HSE exposure points
0
Daily exposure A(8)
0.00m/s²
0EAV — 100 pointsELV — 400 points
Below the Exposure Action Value (100 points) at this usage.
Guidance tool only — use measured or manufacturer vibration data for your actual tools where available. Thresholds per the Control of Vibration at Work Regulations 2005 and the HSE ready-reckoner.
Frequently asked questions
- What is the HAVS exposure action value (EAV)?
- The Exposure Action Value is a daily vibration exposure of 2.5 m/s² A(8) — 100 HSE exposure points. At or above this level the Control of Vibration at Work Regulations 2005 require you to take action to reduce exposure and to provide health surveillance for the workers affected.
- What is the HAVS exposure limit value (ELV)?
- The Exposure Limit Value is a daily vibration exposure of 5 m/s² A(8) — 400 HSE exposure points. This is the maximum a worker may be exposed to in a day; work must be organised so it is not exceeded.
- How are HAVS exposure points calculated?
- Points follow the HSE formula: 2 × (vibration magnitude in m/s²)² × trigger time in hours, summed across every tool used that day. The A(8) daily exposure equals the square root of total points divided by 4, which is why 100 points equals 2.5 m/s² and 400 points equals 5 m/s².
- Where do I find a tool's vibration magnitude?
- Use measured data for your actual tool and task where you have it, or the manufacturer's declared vibration emission adjusted for real use. The preset values in this calculator are typical figures to get you started — your own tool's data is always better.
Valegrid Flow calculates HAVS automatically from your timesheets — no spreadsheets, no manual points.
See HAVS monitoring