📉 LTIFR Calculator
Lost Time Injury Frequency Rate — lost-time injuries per million hours worked.
LTIFR = (Lost time injuries × multiplier) ÷ total hours worked. Compare only against rates using the same multiplier — a “per million hours” figure is five times a “per 200,000 hours” figure for the same performance.
Frequently asked questions
What is LTIFR?
LTIFR (Lost Time Injury Frequency Rate) is the number of lost-time injuries per million hours worked. It is commonly used in international reporting, particularly in energy, mining and construction.
How do you calculate LTIFR?
LTIFR = (number of lost-time injuries × 1,000,000) ÷ total hours worked. Example: 3 lost-time injuries over 2,500,000 hours gives (3 × 1,000,000) ÷ 2,500,000 = 1.2.
What counts as a lost-time injury?
Generally, a work-related injury that leaves the worker unable to perform their normal work beyond the day of the injury. There is no single universal definition: organisations and reporting frameworks differ, particularly on fatalities, occupational illness and restricted work, so always state the definition you use alongside the number.
What is a good LTIFR?
There is no universal “good” figure — it depends on industry, activity and how strictly lost time is defined and reported. Compare against your own trend and published sector benchmarks that use the same definition and multiplier, and treat a very low LTIFR with healthy scepticism if reporting culture is weak.
Why do some LTIFR figures use 200,000 hours instead of 1,000,000?
200,000 hours is the OSHA (US) basis, roughly 100 full-time workers for a year; 1,000,000 hours is the common international basis. The same performance gives a figure five times larger on the million-hour basis, so only compare rates that use the same multiplier.