1. What Are Frequency and Severity Rates?

Frequency Rate (FR) and Severity Rate (SR) are key metrics used in occupational health and safety to measure workplace injury performance. FR measures how often incidents occur, while SR measures the severity of those incidents.

2. How Does the Calculator Work?

The calculator uses the following equations:

Where:

• \( FR \) — Frequency Rate (unitless)
• \( SR \) — Severity Rate (unitless)
• \( I \) — Number of incidents
• \( D \) — Number of days lost
• \( H \) — Total hours worked

Explanation: The equations standardize incident rates per million hours worked, allowing for comparison across different organizations and time periods.

3. Importance of FR and SR Calculation

Details: These metrics are crucial for assessing workplace safety performance, identifying trends, and implementing targeted safety interventions.

4. Using the Calculator

Tips: Enter the number of incidents, total days lost, and total hours worked. All values must be valid (non-negative numbers with hours > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good FR or SR?
A: Lower values are better, but benchmarks vary by industry. Compare against industry averages for meaningful interpretation.

Q2: Why multiply by 1,000,000?
A: This standardizes the rate to "per million hours worked" which is the conventional unit for these metrics.

Q3: What counts as an "incident"?
A: Typically, any work-related injury or illness that requires medical treatment beyond first aid.

Q4: How should "days lost" be calculated?
A: Count calendar days the employee was unable to work due to the incident, including weekends and holidays.

Q5: Are there limitations to these metrics?
A: They don't capture near misses or potential incidents, and can be influenced by reporting practices.