Accident frequency, severity and rate calculator
Enter your accident count, lost days and hours worked, and see the result side by side in the Turkish (SGK), US (OSHA/BLS) and European conventions. The same accident yields different numbers; a comparison without naming the convention is a wrong comparison.
1 · Accident data
2 · Hours worked
or let it be calculated from these three
Results
| Measure | Value | Unit | Convention |
|---|
Compared with the national average
Legal basis
The table shows the obligations of the legislation region you pick in the top bar; it refreshes without reloading the page when the region changes.
Legal basis — Türkiye
| Obligation | Legal basis | How the tool covers it |
|---|---|---|
| The employer keeps a record of all occupational accidents and diseases, carries out the necessary investigations and draws up the related reports. | Occupational Health and Safety Law No. 6331, Art. 14(1)(a) | The case count input block of the tool; the calculation takes the number of recorded cases as its input. |
| The employer investigates and reports events that did not cause injury or death but damaged, or had the potential to damage, the workplace or the work equipment. | Occupational Health and Safety Law No. 6331, Art. 14(1)(b) | Near misses do not enter the rate calculation; the tool counts only recorded cases and that distinction is visible in the input block. |
| The employer notifies occupational accidents to the Social Security Institution within three working days of the accident. | Occupational Health and Safety Law No. 6331, Art. 14(2)(a) | The caption under the results: in official notification and inspection it is the institution's own definition and the workplace records that bind. |
| The employer notifies occupational diseases reported to it by health service providers or the workplace physician within three working days of learning of them. | Occupational Health and Safety Law No. 6331, Art. 14(2)(b) | The occupational disease case field in the input block; the result table gives the frequency, severity and incidence rates of the Turkish convention. |
| Health service providers notify the occupational accidents brought to them, and authorised providers notify the occupational disease cases they diagnose, to the Social Security Institution within ten days at the latest. | Occupational Health and Safety Law No. 6331, Art. 14(4) | The comparison-with-the-national-average block on the page; the published national statistics are compiled from these notifications. |
Recording and notification are two separate duties in Türkiye: the employer keeps the record and the notification goes to the Social Security Institution within three working days.
Legal basis — European Union
| Obligation | Legal basis | How the tool covers it |
|---|---|---|
| The employer shall keep a list of occupational accidents resulting in a worker being unfit for work for more than three working days. | Framework Directive 89/391/EEC, Art. 9(1)(c) | The lost-time case field in the input block; the EU threshold is more than three working days. |
| The employer shall draw up, for the responsible authorities and in accordance with national laws and practices, reports on occupational accidents suffered by his workers. | Framework Directive 89/391/EEC, Art. 9(1)(d) | The caption under the results: in official notification it is the institution's own definition that binds. |
| Member States shall define, in the light of the nature of the activities and size of the undertakings, the obligations to be met by the different categories of undertakings when preparing those documents. | Framework Directive 89/391/EEC, Art. 9(2) | The page's own note that European statistics give the rate per hundred thousand workers; the base varies by country. |
The Framework Directive does not give a rate formula; it binds the keeping of a list and the drawing-up of reports, and writes the more-than-three-working-days threshold explicitly.
Legal basis — United Kingdom
| Obligation | Legal basis | How the tool covers it |
|---|---|---|
| Where a person at work suffers, as a result of a work-related accident, a bone fracture other than to a finger, thumb or toe, an amputation, permanent blinding or reduction of sight, a crush injury damaging the brain or internal organs, a burn covering more than 10% of the body surface, scalping requiring hospital treatment or loss of consciousness from head injury or asphyxia, the responsible person must follow the reporting procedure. | RIDDOR 2013, reg. 4(1) | The severe case fields in the input block; in Great Britain the reportable injuries are enumerated in a list. |
| Where a person at work is incapacitated for routine work for more than seven consecutive days, excluding the day of the accident, the responsible person must send a report to the relevant enforcing authority within 15 days of the accident. | RIDDOR 2013, reg. 4(2) | The lost-time case field in the input block; the threshold differs from the Turkish three-working-day notification deadline. |
| Where a person dies as a result of a work-related accident the responsible person must follow the reporting procedure; where an injury reportable under regulation 4 causes death within one year of the accident, the employer must notify the death without delay. | RIDDOR 2013, reg. 6(1) and 6(3) | The fatality field in the input block; the result table counts fatal cases separately. |
| The responsible person must keep a record of reportable incidents, reportable diagnoses and injuries incapacitating a person for routine work for more than three consecutive days, excluding the day of the accident. | RIDDOR 2013, reg. 12(1)(a)-(c) | The case count fields in the input block; the recorded and the reported thresholds differ in Great Britain, three days against seven. |
| An entry in the record must be kept for at least three years from the date on which it was made, and the record must be kept at the place where the work is carried on or at the usual place of business of the responsible person. | RIDDOR 2013, reg. 12(2) | The caption under the results: in an inspection it is the workplace's own records that bind. |
The thresholds and deadlines are written separately in Great Britain: incapacity of more than seven days is reported within 15 days, while incapacity of more than three days is not reported but must be recorded.
Legal basis — United States
| Obligation | Legal basis | How the tool covers it |
|---|---|---|
| Each employer required to keep records must record each fatality, injury and illness that is work-related, is a new case and meets one or more of the general recording criteria. | 29 CFR 1904.4(a) | The recordable case field in the input block; TRIR is computed from that number. |
| An injury or illness meets the general recording criteria if it results in death, days away from work, restricted work or transfer to another job, medical treatment beyond first aid, or loss of consciousness. | 29 CFR 1904.7(a) | The "days away plus restricted work or transfer (for DART)" field in the input block; the DART definition comes straight from this provision. |
| The employer must use the OSHA 300, 300-A and 301 forms or equivalent forms and must enter each recordable injury or illness on the 300 Log and 301 Incident Report within seven calendar days of receiving information that it occurred. | 29 CFR 1904.29(a) and (b)(3) | The page's block on the formulas and where they come from; the input of the United States convention is this set of forms. |
| In completing the annual summary the employer must enter the calendar year, the company name, the establishment name and address, the annual average number of employees covered by the 300 Log and the total hours worked by those employees. | 29 CFR 1904.32(b)(2)(ii) | The hours-worked block of the tool; the total hours field is exactly the quantity in this provision and is the denominator of TRIR and DART. |
| Within eight hours after the death of an employee from a work-related incident, and within twenty-four hours after an in-patient hospitalisation, an amputation or the loss of an eye, the employer must report to OSHA. | 29 CFR 1904.39(a)(1) and (a)(2) | The caption under the results: the notification deadline does not enter the calculation, in official reporting it is the agency's own rule that binds. |
In the United States recording runs on OSHA's own set of forms and the annual summary asks directly for the total hours worked that form the denominator of the calculation. For fatalities and hospitalisations the deadline is measured in hours.
The formulas and where they come from
In the Turkish convention the frequency rate is accidents per one million hours worked, the severity rate is work days lost per thousand hours worked, and the incidence rate is accidents per hundred workers; these are the definitions of the rates SGK publishes. In the US convention TRIR and DART are based on 200,000 hours worked — the figure represents one year of 100 full-time workers (100 × 40 hours × 50 weeks). European statistics express the rate per 100,000 workers. Hours worked exclude leave, holidays and sick time.
The calculation runs in your browser; none of the numbers you type are sent to a server or stored.
The results are for information. What binds official reporting and inspection is the institution's own definition and your own records.