LTIFR Calculator

Calculate your Lost Time Injury Frequency Rate (LTIFR) — the number of lost time injuries (injuries resulting in the injured person being unable to attend their next scheduled work day/shift) standardized against total hours worked, to benchmark safety performance across sites, periods, or against industry data.

Reporting Standard / Base Hours Determines the standardization multiplier used in the formula.

Number of Lost Time Injuries (LTIs) Injuries causing absence beyond the day of the injury — the injured person could not attend their next scheduled shift.

Total Hours Worked Total exposure hours by all employees in the same period.

0.00

Lost Time Injuries per Standardized Hours

Formula Reference

LTIFR = (Number of Lost Time Injuries × Base Hours) ÷ Total Hours Worked

Per Million Man-Hours	1,000,000 hrs base (most common)
OSHA-style	200,000 hrs base (100 FTE / yr)
UK / RIDDOR-style	100,000 hrs base

What Counts as a Lost Time Injury?

A work-related injury or illness that results in the affected person being unable to work their next scheduled shift or work day, beyond the day the injury occurred. This is distinct from a "recordable" injury (used in TRIR), which is a broader category that also includes injuries requiring medical treatment beyond first aid, even without lost time.