Calculator
Incident rate calculator
Calculate a recordable incidence rate using the formula published by the US Bureau of Labor Statistics, with the working shown.
Count the cases that meet your recording definition for the period.
Exclude paid non-work time such as holidays and leave.
Check which base and case definition your organisation or regulator uses before comparing figures.
Incidence rate0.00
The formula
Incidence rate = (Number of injuries and illnesses × 200,000) ÷ Employee hours worked
BLS explains that 200,000 hours is the base for 100 full-time-equivalent workers working 40 hours a week for 50 weeks a year, which allows comparison between organisations of different sizes. Its worked example. 7 cases in 400,000 hours. Gives 3.5, the default shown above.
Source: US Bureau of Labor Statistics. How to compute your firm’s incidence rate (checked 30 October 2026).
A rate is a lagging indicator. Read leading and lagging indicators for how to balance it.