Injury Frequency Rate Calculator
This page works out two injury rates for a workplace or a crew, per million hours worked. The first counts only injuries that caused lost time. The second counts all recordable injuries. Enter your own counts for the period.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Each rate is the number of injuries times 1,000,000, divided by the total hours worked in the same period. The basis is a million hours, so rates can be compared between groups of different size.
Use the same period and the same definition of recordable for each count. What counts as recordable depends on your local safety rules.
Worked example
Over 200,000 hours worked, the lost-time rate is 10 per million hours, and the total recordable rate is 25.
Questions
Why multiply by a million?
It turns a small fraction into a number that is easy to compare. A rate per million hours means the same thing for a crew of five or fifty.
What counts as lost time?
It depends on the rules your workplace follows. Check the definition you use, since it sets which injuries are counted in the first rate.
Does this replace my safety records?
No. It is a calculation from your counts. Keep the records themselves and the reports behind them.
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