Safety performance calculator
Normalize recorded days away and restricted or transferred workdays against employee hours for a consistent severity measurement.
Enter days away, job-transfer or restriction days, and employee hours. The normalized severity rate and transparent equation will appear here.
Formula
This calculator uses recorded day totals in the numerator rather than the number of incidents:
Severity rate = ((days away + restricted or transferred days) × 200,000) ÷ employee hours worked
The 200,000-hour base represents 100 full-time employees working 2,000 hours each during a year.
Input scope
The result expresses recorded lost or restricted workdays per 100 full-time-equivalent workers. A higher result indicates more recorded days relative to the employee hours represented by the input.
Interpret the result alongside TRIR, DART, incident details, exposure hours, workforce size, hazard controls, reporting practices, and leading safety indicators. A single long-duration case can materially change the rate.
This calculator does not determine OSHA recordability, classify cases, validate day counts or employee-hour totals, select an appropriate benchmark, measure every form of workplace harm, predict individual risk, or establish compliance.
A severity rate normalizes recorded days away from work and restricted-work or job-transfer days against employee hours. It describes the magnitude of lost or restricted time rather than the number of cases.
The calculator adds days away from work and job-transfer or restriction days, multiplies the combined total by 200,000, and divides the result by employee hours worked during the same reporting period.
Enter recorded calendar day totals. Unlike TRIR and DART calculations, the severity-rate numerator uses days rather than case counts.
No. The calculation does not determine recordability, validate OSHA 300 Log entries, replace current recordkeeping requirements, measure every type of harm, or establish regulatory compliance.
Primary references
Review these primary OSHA resources alongside current state-plan, local, project, manufacturer, employer, and qualified-professional requirements that apply to the work.
Official OSHA technical guidance describing severity rate as a normalized calculation using days away or restricted days in the numerator.
Official OSHA requirements for recording and counting days away from work and restricted-work or job-transfer days.
External references are provided for research and verification. Their inclusion does not make a generated document compliant, approved, certified, or complete for a particular workplace.