The table below is a ready reckoner for calculating daily vibration exposures. All you need is the vibration magnitude (level) and exposure time. The ready-reckoner covers a range of vibration magnitudes up to 40 m/s² and a range of exposure times up to 10 hours.

The exposures for different combinations of vibration magnitude and exposure time are given in exposure points instead of values in m/s² A(8). You may find the exposure points easier to work with than the A(8) values:

• exposure points change simply with time: twice the exposure time, twice the number of points;
• exposure points can be added together, for example where a worker is exposed to two or more different sources of vibration in a day;
• the exposure action value (2.5 m/s² A(8)) is equal to 100 points;
• the exposure limit value (5 m/s² A(8)) is equal to 400 points;