International accident frequency rate. Based on HSE UK / IOGP. Results shown with the full formula so you can verify. Zero signup, zero tracking, zero data sent to a server — all calculation is client-side.
{
"rate": 2.5,
"base": 1000000,
"formula": "(5 × 1,000,000) ÷ 2,000,000"
}International Accident Frequency Rate (AFR) — HSE UK / IOGP standard. 1,000,000-hour base. Used by UK and most Commonwealth countries for mandatory reporting, and by IOGP members for global oil & gas benchmarking.
Convertible to OSHA TRIR via the 5× rule of thumb (TRIR ≈ AFR ÷ 5 approximately, though scope differs).
AFR = (Reportable Accidents × 1,000,000) ÷ Hours WorkedHSE UK / IOGP
Different bases — 1M (AFR) vs 200k (TRIR). Different scopes — AFR varies by regulator; TRIR is OSHA-defined.
Free for any website, blog, or course — MIT / CC BY 4.0. Attribution stays visible.
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