Impact Tech Solutions · HSE Calculators
LTIFR

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.
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Lost Time Injuries per Standardized Hours

Formula Reference

LTIFR = (Number of Lost Time Injuries × Base Hours) ÷ Total Hours Worked
Per Million Man-Hours1,000,000 hrs base (most common)
OSHA-style200,000 hrs base (100 FTE / yr)
UK / RIDDOR-style100,000 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.
Calculations follow standard international LTIFR methodology (injuries × base hours ÷ total hours worked). Results are for guidance only — always verify against your organization's official recordkeeping and applicable regulatory requirements, as the exact definition of "lost time" can vary by jurisdiction. For customized calculators tailored to your organization, please contact Impact Tech Solutions.
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