This calculator is provided for employers to make estimates of hand-arm vibration exposures and estimate the effects of changes to work patterns and methods.

The results of calculations are dependent on the quality and suitability of the data entered by the user.

Enter vibration magnitudes and exposure durations (for an individual worker or a task carried out by several workers) in the fields.
Results are displayed below the fields

You can use the indicative vibration magnitude data from Vibration Magnitudes of some common Power Tools.

• Vibration magnitude is the frequency-weighted r.m.s. acceleration value in m/s2 for each tool or process.
• Exposure duration is the total daily vibration contact time or “trigger time” for each tool or process.
  It may be expressed in hours, but must not exceed 24 hours.

• Exposure points per hour is the number of points by which exposure increases per hour. e.g. A machine giving 25 points per hour, if used for 3 hours will give an exposure of 3 x 25 = 75 points
• Exposure points is a simple alternative to the A(8) value for describing and managing exposures in the workplace. The exposure action value (EAV) is equivalent to 100 points and the exposure limit value (ELV) is equivalent to 400 points).
• Time to reach EAV is the time required to reach the exposure action value (EAV) of 2.5 m/s2 A(8).
• Time to reach ELV is the time required to reach the exposure limit value (ELV) of 5 m/s2 A(8).(Exposure points per hour, time to reach EAV and the time to reach ELV are calculated from the vibration magnitude for each tool or process.)
• Partial exposure is the vibration exposure, expressed in m/s2 A(8) and in exposure points, for each tool or process. It is calculated from the vibration magnitude and the exposure duration.
• Total exposure, also in m/s2 A(8) and in exposure points, is calculated from all the partial exposures.