AFR Calculator (Accident Frequency Rate)

AFR = Accident Frequency Rate. The international (ILO/HSE UK/IOGP) equivalent of OSHA's incident rate, standardized per 1,000,000 hours worked rather than 200,000 — widely used in UK, European, Middle Eastern, and multinational HSE reporting.

Reporting Base

Number of Accidents Your organization's defined "reportable accident" scope — e.g., RIDDOR-reportable (UK), all recordables, or lost-time injuries. Be consistent period to period.

Total Hours Worked

Number of Fatalities (optional) If provided, also calculates the Fatal Accident Rate (FAR) per 100,000,000 hours.

0.00

AFR

0.00

≈ Equivalent OSHA TRIR

0.00

FAR (per 100M hours)

Formula Reference

AFR = (Number of Accidents × Base) ÷ Total Hours Worked
FAR (Fatal Accident Rate) = (Number of Fatalities × 100,000,000) ÷ Total Hours Worked
Quick conversion: AFR (per 1,000,000) ÷ 5 ≈ Equivalent OSHA TRIR (per 200,000), since 1,000,000 ÷ 200,000 = 5. This is only an approximation — AFR and TRIR often differ in exactly which cases count as "reportable," not just the base multiplier.

Base Convention by Framework

AFR (ILO / HSE UK / IOGP)	1,000,000 hours
OSHA TRIR / DART	200,000 hours
FAR (Fatal Accident Rate)	100,000,000 hours (fatalities are rare — a larger base avoids meaningless tiny decimals)

Illustrative Industry AFR Ranges (General Reference Only)

Frequently-cited general ranges: Oil & Gas ~1–2, Manufacturing ~3–5, Construction ~4–6, with many organizations targeting AFR below 1.0 as a "world-class" goal. These vary enormously by source, region, and exact accident-scope definition — always benchmark against your specific sector's published data (e.g., IOGP Safety Data Report for oil & gas) rather than a generic number.

AFR scope varies by regulatory framework — under UK RIDDOR this typically means fatal injuries, specified injuries, over-7-day injuries, and dangerous occurrences; under other frameworks it may mean all recordable cases or lost-time injuries only. Define and document your organization's "accident" scope clearly, and keep it consistent across reporting periods and any sites/companies you're comparing against. For customized calculators tailored to your organization, please contact Impact Tech Solutions.