What is First-Aid Injury Frequency Rate?

A question ' How often do injuries occur?' is replied by the frequency rate which is defined as the disabling (First-Aid) injuries per 1000000 (Million) man-hours worked.

F = (Number of First-Aid injury x 1000000) / Number of manhours worked

If the injury does not cause loss of time but person may work after first aid treatment in the period in which it occurs but in a subsequent period the injuredperson can work without any inturruption then this should be logged as First-Aid injury

If an injury causes intermittent loss of time, it should only be included in the frequency rate once that is, when the first loss of time occurs.

Since frequency rate F, is based on the First-Aid injuries reportable to the statutory authorities, it ma) be used for official purposes only. In all other cases frequency rate F, should be used for comparison purposes.

In some country, the first aid injury frequency coefficient (F) h determined by

F = (Number of First-Aid injury x 1000) / Number of manhours worked

FAI Frequency Rate Calculator

Noumber of First-Aid injury



Number of Manhours worked






Frequency Rate

Calculate FAI Frequency Rate Here