Use the free HAVS exposure points calculator

Work out a day's exposure

1. 1

   Open the HAVS exposure points calculator from the free tools page

2. 2

   Under Tool 1, enter the Vibration magnitude (m/s²) and the trigger time in Hours and Minutes

   Tool or task (optional) is a label for you. Trigger time is the time the person's hands are on the tool while it runs.

3. 3

   Click Add another tool for each other vibrating tool the person uses that day

4. 4

   Read the day's result under Total exposure points and Daily exposure

   Each tool also shows its own points, its partial exposure in A(8), and how long it takes on its own to reach the action value and the limit value.

Try HSE's worked example

Click Use HSE's worked example to load the example from HSE's guidance L140: an angle grinder at 8 m/s² for 3 hours and a needle scaler at 12 m/s² for 30 minutes. Click Clear to start again.

What the result means

100 points is the exposure action value (2.5 m/s² A(8)) and 400 points is the exposure limit value (5 m/s² A(8)). The box under the totals says where the day sits, and warns you when it is close to either value.

The calculator is a guide. Your risk assessment decides the controls. The calculator page explains the formulas and the legal duties, with links to the sources.