What is Lost Time Injury Frequency Rate (LTIFR)?

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

F = (Number of lost time injury x 1000000) / Number of manhours worked

If the injury does not cause loss of time in the period in which it occurs but in a subsequent period the injury should be included in the frequency rate of the period in which the loss of time begins.

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 lost time 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 frequency coefficient (F) h determined by

F = (Number of lost time injury x 1000) / Number of manhours worked

LTI Frequency Rate Calculator

Noumber of lost time injury



Number of Manhours worked






Frequency Rate

Calculate LTI Frequency Rate Here