Safety Conquer · Free practical tool

Incident rate calculator

Distinguish recordable case counts from lost-day totals when calculating US safety rates. Keep workforce hours and case counts within the same reporting boundary.

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The method

US TRIR = recordable cases × 200,000 / hours worked; DART rate = DART cases × 200,000 / hours worked.

Before using the result

  • Use case counts, not lost-day counts. Cases/hours must cover the same period and workforce; this tool does not decide recordability. DART is a subset of recordable cases.

Worked examples

These original training examples illustrate the method for Certified Safety Professional (CSP). Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.

1. Worked example

Distinguish recordable case counts from lost-day totals when calculating US safety rates. Keep workforce hours and case counts within the same reporting boundary.

User-classified recordable cases
3
User-classified DART cases
1
Employee hours worked in period
200,000
  1. TRIR = 3 × 200000 / 200000.
  2. DART = 1 × 200000 / 200000.
  • TRIR: 3
  • DART rate: 1

2. Comparison example

Compare a different supplied condition using the same method. For Safety Conquer, the important check is that the input meaning, units and method assumptions still match the problem.

User-classified recordable cases
3
User-classified DART cases
1
Employee hours worked in period
400,000
  1. TRIR = 3 × 200000 / 400000.
  2. DART = 1 × 200000 / 400000.
  • TRIR: 1.5
  • DART rate: 0.5

Check your understanding

1. Which relationship is used?

US TRIR = recordable cases × 200,000 / hours worked; DART rate = DART cases × 200,000 / hours worked.

2. Which assumption should you check first?

Use case counts, not lost-day counts. Cases/hours must cover the same period and workforce; this tool does not decide recordability. DART is a subset of recordable cases.

3. How should you verify a different unit system?

Convert every input to the displayed calculation units first. Equivalent physical inputs must give equivalent results; a unit label alone does not convert a number.

Continue with the matching exam topic

This tool connects to Certified Safety Professional (CSP) free practice. Work through a question independently, then use the calculation steps to identify where your method differs. The tool stays free whether or not you choose paid preparation.

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