Within the work book there is two types of sheets one with Leading Indicators Under the Monthly Stats Tab, The other is under the current Stats Tab. How to calculate: Incidence rates represent the number of injuries and/or illnesses or lost workdays per 100 full time workers and are calculated as: N x 200,000 ÷ EH, where: N = number of injuries and/or illnesses or lost workdays EH = total hours worked by all employees during calendar year. 1 0. In all other cases frequency rate F, should be used for comparison purposes. Include the entries in Column H (cases with days. TRIF - Total Recordable Incident Frequency. Dengan menggunakan statistika K3, perusahaan dapat menilai kinerja keselamatan dan kesehatan kerja mereka, serta membandingkan kinerja mereka. The result is then multiplied by 200,000. Frequency rates are computed as follows: (NUMBER OF. A lost time injury is an injury sustained on the job by worker that results in the loss of productive work time. The lost time injury rate (LTIR) of an organization, a jobsite, or a department is calculated using a simple formula. The LTIFR is the average. Use a convenient multiple of 10 so that you can envision a whole number of people for comparison. It reflects the. Risks and rates can be further manipulated to provide additional information on the effects of the exposure of interest, such as risk ratios, rate ratios, attributable risks (risk or rate differences) and attributable risk percent. P = IR x D). 1. lets take a random month where I work. 4% decrease on the 2019 result. The formula is: Accident Rate = (Number of accidents X 200,000) / Employee hours workedTotal Lost Work Days * 200000/Total Hours worked. The TCR. One can express the final result as the number of cases per 100 people, or per 1,000, or per 10,000, or per 100,000. A key aspect of tracking safety performance for any business is calculating the Total Recordable Injury Frequency, or TRIF. Notes on engagement rate Engagement rates are a particularly important indicator as they help us to understand developments in workers’ willingness to report incidents and observations. It means that the incidence rate of new diagnoses of breast cancer in this population is 2 per 100,000 women per year. 9 Major Injury rate 18. The total hours worked in this period (for all employees) was 800,000. 1 in 2021 (which was the same rate as pre-COVID year 2019). The Total Case Incident. The total case incident rate (TCIR) is a figure that represents the number of work-related injuries per 100 full-time workers over the course of a year. As you can see, there are just three parts of the LTIFR formula, two of which need to be reconciled on your end, and then the 1,000,000 figure which. In the formula, 200,000 signifies the total number of hours worked by 100 employees over the course of a year and results in a. Using the information provided on the OSHA Form 300, calculate the Total Illness Incidence Rate for a 50-employee firm. 1 injury. Number of people ( employees + contractors) on site in rolling 12 months = 40. It’s all below in our DART rate calculator. 1 in 2018, according to the Bureau of Labor Statistics. 3 means that 12. Downer’s Lost Time Injury Frequency Rate (LTIFR) was also below target at 0. 1,800 days. 2-26 Figure 2-8 Incidence Rate Worksheet for _____ Company (Optional) Incidence Rate Columns from OSHA 300 Log 300 Log Column EntryTotal recordable occupational incidents (injuries & illness)case rate: The total recordable case rate is a measure of the frequency of all occupational injuries and illnesses that are recordable. Some people confuse this formula with the formula for lost time injuries, but the total recordable injury frequency rate includes all injuries requiring medical treatment from a medical professional - which in theory means that it will be a larger number. A good total recordable incident rate (TRIR) is typically a rate that is lower, indicating better safety performance. Divide by the result by the total number of hours worked. Number of work-related injuries × 1,000 / Average number of employees. 1% to 418. Safety Index. This means that for every one million hours worked in the facility, there are 40. Conclusion: If we were to research 1,000 businesses in a one-year period, there would approximately be 10 businesses that are forced into bankruptcy. In medicine, the incidence is commonly the newly identified cases of a disease or condition per population at risk over a specified timeframe. Then divide by the total number of employee hours worked in the year. This includes the cumulative hours worked by all employees during the specified period. 0 18. F = (Number of First-Aid injury x 1000. Please visit the website and fill out the short online questionnaire. Number of LTI cases = 2. LTIFR = (14 / 800,000) = 0. The method for calculating the LTIFR is: the number of lost time injuries in an accounting period, divided by the total number of hours worked in the same period, multiplied by one million. Standardised incidence rate 𝑠𝑠. For example, if all your employees during last year worked for a total number of hours equal to 2,000,000, and your number of recordable injuries is 2: TRIR = (2 × 200000) / 2000000 = 400000 / 2000000 = 0. Publication Date: 2016 Asset type: Calculator. 00115 (1. The lower the value deduced from the above calculation, the better. Get. Mathematically: Incidence rate = (Total number of recordable incident) x 200,000 /. Total recordable frequency rates of various types are used throughout industries for indications of past performance and not the future forecasts. Using this TRIFR calculation formula, the result is the total recordable injury frequency rate. Total number of hours worked by all employees. Incidence rates (density) can be measured in a closed cohort or in an open population. During a research study, each person is observed from an established. 8%) were minor injuries. 4. It may also be calcu-lated as the ratio of the total days lost and. The first step is to calculate for each year a fixed set of weights w. The formula for calculating your accident frequency rate is the number of reported accidents multiplied by 200,000, divided by the number of employee hours worked. 1%) were disabling injuries, 66 (0. Suppose you had three recordable incidents during the year. The formula itself is quite simple, but its implications can be pretty significant. Calculating Lost Time Injury Frequency Rate. Unless there is a positive action by management, what has happened in the past will continue to happen. Divide that by 80,000, and you’ll get a recordable incident rate of 7. of Fatal and Non-Fatal Workplace Injuries No. 045 per patient-month, or 4/7. TABLE 1. The fatal work injury rate was 3. The total recordable incident rate or TRIR is a measure of occupational safety. Workplace Injury Rate3 395 344 Fatal Injury rate 1. (Number of injuries in the last 12 months / Total hours worked in the same 12 months ) * 1,000,000 = TRIFR. In some publications, epidemiologists may use incidence to mean the number of new cases in a community whilst in others, it means the number of new cases per unit of population. LTIFR = (14 / 800,000) x 200,000 = 3. Total number of hours worked by all. Vehicle Accident Rate: This rate is derived by multiplying the number of vehicle accidents by 1,000,000 miles and dividing by the mileage driven for a given period of time (a calendar year). The adjusted estimates for a particular characteristic, such as injury and illness cases involving days away from work, are aggregated to the appropriate level of industry detail. Also known as Total Case Incident Rate, TRIR gives companies a snapshot of their. The Total Case Incident Rate (TCIR) is defined as the number of work-related injuries per 100 full-time workers during a one year period. Untuk TRFR (Total Recordable Frequency Rate) menggunakan konstanta 1. Take your total number of recordable cases, multiple that number by 200,000 and then divide that combined number by the total number of hours worked. 05/1000 per year in chronic diseases. Severity rate= days lost in a year due to accidents/number of man. Its numerator is the same as incidence proportion, but its denominator is different. You can calculate your TCIR or TRIR by using the following formula: (Number of OSHA Recordable injuries and illnesses X 200,000) / Employee total hours. 9% from 2020 12/16/2022 There were 5,190 fatal work injuries recorded in the United States in 2021, an 8. And voila!To calculate the Total Recordable Incident Rate, use the formula: (Number of Total Recordable Incidents / Total Hours Worked) x 200,000. It would be a mistake to say establishments with the highest rates in these files are the "most dangerous" or "worst" establishments in the nation. On the other end of the spectrum, some companies had a perfect 0 TRIFR, while WorleyParsons. If the injury does not cause loss of time in the period in which it occurs but in a subsequent period. Start Free Trial. A simple formula for calculating accident incidence (frequency) is to: Take the total number of recordable incidents for the year from your OSHA 300. 4. And unlike the lost time injury frequency rate (LTIFR), it includes any injury that has affected the normal course of your operations even if the affected employee has not ceased working. These differed from 15. 9% from 2020 12/16/2022 There were 5,190 fatal work injuries recorded in the United States in 2021, an 8. Re = total number of eligible respondents. (Number of recordable cases x 200,000) / Employee total hours worked:. Here are some benchmarks: A perfect TRIR is 0, the product of zero employee accidents/incidents. i. Now, the preprocessed data are passed to injsummary() to calculate injury summary statistics:. The calculation is made by dividing the total number of lost workdays by the total number of recordable incidents. Injury/Illness Rates* * The industry-wide illness/injury rates are from the 2015 Bureau of labor Statistics table: “otsb4732”. Safe Work Australia is proud to announce the full release of our data website, data. Step 4: Calculate Incident Frequency Rate. Rate Calculation: An incidence rate of injuries and illnesses is computed from the following formula: (Number of injuries and illnesses x 200,000) / Employee hours worked = Incidence rate. It tells you how many time-loss injuries happened per 100 full-time employees. Lost time injury frequency rates. 001295. The total hours worked by allThe calculation of a business’s lost time injury frequency rate (LTIFR) is done by multiplying the total number of LTIs by one million and then dividing the resulting number by the total number of hours worked during the reporting period. Total recordable injury frequency rate (TRIFR) is a metric used to gauge an organization's safety performance. 6. 5 700 77. The formula to calculate IFR is as follows: IFR = (Total Number of Incidents / Total Hours Worked) x 100,000. For instance, if you had two cases where an employee missed work from a workplace accident, your DART would also be 2. Specified period = 278 days. TRIR, TRIF, Total Recordable Incident Rate, Total Recordable Incident Frequency, Incident Rate, Incident. This rate provides the number of vehicle accidents that occurred during the year per million miles. In 2020, 74 members took part in benchmarking, compared with 75 in. Any accident which is reported on site or in the workplace will become a part of the resulting AFR number. b. 2. Therefore, the LTA Frequency Rate for this period is 10. Injury Frequency (also known as: Lost Time cases + Restricted Duty Cases + Death/Fatality Cases + Other. Safe Work Australia is proud to announce the full release of our data website, data. Floor Marking. AIFR = (Reported injuries x 200,000) / Employee total hours worked. Disabling Injury Frequency Rate (DIFR) The total number of disabling and fatal occupational injuries per 1 million hours worked. Generally, a good TRIR safety rate would be around 3. Add the entries from Part 1B: Summary of Work-Related Injuries and Illnesses. a year. To calculate the incidence rate, we use this incidence rate calculator: Total number of new cases = 1; and; Total population at risk = 50,000. If the TRIR rate is high, it indicates that the company's work sites are dangerous. The rate represents the number of fatal occupational injuries per 100,000 full-time equivalent workers and is calculated as: where: Rs = hours-based rate of fatal injuries for a state, NS = number of fatal work injuries in the state, EHS = total hours worked by all employees in the state during the calendar year, and. It found considerable variation depending on the selection of the denominator. The formula can also be multiplied by 1,000,000 to get the injury frequency. Visit Discussion Forum for Online TRCF Calculator tool. 4 per 100,000 FTE in 2020. 9 TRCF. (OSHA requires accident rates to. Severity Rate = No of Days lost x 1,000/Total No. Two things to remember when totaling your annual. 7 person-yrs. The Lost Time Injury Fatality Rate calculator can now be seen on the Data website. g. the number of accidents. 5, means that 3. Take the number from Step 3 and divide it by the number from Step 2. 4 14. The difficulties often encountered when calculating LTIFR, TRIFR and other safety indicators are not with the calculation itself but with the data. . The total recordable injury frequency rate (TRIFR) is the number of fatalities, lost time injuries, cases or substitute work and oth. total number of hours worked (including staff and contract), number of people employed (including staff and contract) and. 39. Lost time injuries The overall lost time injury rate. A severity rate is a calculation used to examine the safety performance of an organization, shift or department. 7 9. The following table indicates the average accident frequency rates for various3. Injury Severity Total Lost Work Days Cases * 200,000 /. The formula for calculating incidents is the number of recorded accidents in that year multiplied by 200,000 (to standardize the accident rate for 100 employees) and then divided by the number of employee labor hours worked. This excludes non injury incidents. Add the entries from Part 1B: Summary of Work-Related Injuries and Illnesses. 94%. Using the information provided on the OSHA Form 300, calculate the Total Injury Incidence Rate for a 50. 1 Tier 1 Indicator Purpose 3. The calculation is based on the number of mandatory reported OSHA recordable injuries and illnesses. 80000 hours. I'm trying to adapt this to our department as best as I can but on a weekly basis. au. There was an increase between 2020 and 2021 in the total number of non-fatal. Finally, calculate the Medical Treatment Injury Frequency Rate. Our accident calculator uses the following incidence rate formula: TRIR = (Number of recordable injuries × 200000) / Hours worked. This is one of the most reliable statistics for forecasting future accident experience. 5% of your workforce suffered an OSHA-recordable injury. 000, MTO : Medical Treatment Only RWTC. LTI is a Lost Time Injury (a work-related injury resulting in the loss of one or more complete. Explore how to calculate TRIR and what is a good TRIR rating. It is often used by companies as a measure of. Step 2: Determine the Total Hours Worked. LTIFR calculation formula. An LTI refers to any injury sustained by an employee that results in them missing at least one full day of work after the day the injury occurred. 207 TABLE 6 Comparison between the "Disabling Injury Incidence Rate" as calculated from the DIFR with the actual incidence Sub-sector DUR Disabling injuries. 0104 or approx. So the incidence rate of relief was 6/85 person-hours or on average 7. To do this, you will need to calculate the incidence rate (Total Case Rate – TCR), as well. 0. It is a measure of the number of injuries per 1,000 employees and is usually calculated over a period of time, e. View Online. 9. ” OSHA developed this calculation to gauge a company’s safety record compared to its peers. So the formula, again, is accident rate= (number of accidents*200,000)/number of hours worked. 1 Minor Injury rate 355 377 Occupational Disease Incidence Rate3 16. 4 18. 5 have experienced lost time due to an incident. Total case incident rate: The number of work-related injuries per 100 full-time workers during a one year period. To calculate your company's Total Recordable Incident Rate, multiply the number of recordable incidents by 200,000. ) 329 (n. 3) Average days charged per disabling injury. OSHA recordable incident rate is calculated by multiplying the total recordable incident during a calendar year by 200,000, divided by the total number of hours worked during the calendar year. • Frequency rate (for fatal and non-fatal cases) per 1’000’000 Comparative measures may be calculated for each economic activity, occupation, sex, age group, etc. Incidence rate: 3/107. 3 Location 2. E. This metric is designed to demonstrate the probability of how high or low the chances might be of sustaining a reportable injury at work. 2 Process Safety Indicator Criteria 2. In 2021/22 an estimated 1. Please visit the website and fill out the short online. Sol. AIFR = (Reported injuries x 200,000) / Employee total hours worked. The next step is to find the accident frequency. Multiply the results by 200,000 (this is the generally accepted baseline of LTI established by OSHA; it represents 100 employees working 50 weeks or. It would be a mistake to say establishments with the highest rates in these files are the "most dangerous" or "worst" establishments in the nation. TOTAL RECORDABLE INCIDENT RATE (TRIR) This rate computes the frequency of recordable injuries and illnesses that occur within a given amount of time and is typically for 100 full-time workers for a one-year period. FORMULAS for CALCULATING RATES • OSHA RECORDABLE INCIDENT RATE - a mathematical calculation that describes the number of employees per 100 full-time employees that have been involved in a recordable injury or illness. 1 14. 01-23-2022, 01:23 PM #3. 2. The formula for calculating your total case incident rate is a quite simple. Like the TRIF formula, DART considers the number of cases where an employee missed work from a work-related injury. The formula is as follows: ( [Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the reporting period). While the Incident Rate is the number of injuries per. Rank: Super forum user. Fatal Injury Frequency Rate (FIFR) The total number of fatal occupational injuries per one billion hours worked. AIFR = (Reported injuries x 200,000) / Employee total hours worked. Total recordable incident rate (TRIR) is one of many safety indicators used to evaluate the effectiveness of a company’s safety efforts. Total of 5,190 fatal work injuries in 2021, up 8. While the Incident Rate is the number of injuries per. of new cases of disease / Total population at risk x Population size. Vehicle mileage . Centers for Disease Control and Prevention 1600 Clifton Rd. Accident frequency rate is defined as the number of deaths and injuries in occupational accidents × 1000000/aggregate number of human-hours, and accident severity as the number of workdays lost. au. 1 . Where 200,000 is the # of hours worked in a calendar year by 100 employees and 400,000 is the total # of hours worked in a calendar year by all employees. The formula for calculating your accident frequency rate is the number of reported accidents multiplied by 200,000, divided by the number of employee hours worked. After reviewing and compiling your safety data, you’ve determined that there were six lost time injuries in the past year at your manufacturing company and a total of 2,500,000 hours worked. Next, determine the total hours worked. Total case incident rate: The number of work-related injuries per 100 full-time workers during a one year period. Mean Duration Rate = Total No of Days Lost/Total No of Accidents. The estimated number of people with an over-3-day absence injury at any time. For instance, a higher-than-average TRIF could result in boosted insurance rates, or surprise safety inspections. 3), Qantas (24. ). A TRIR of 12. Using these documents, simply plug in the number of recordable injuries and illnesses with total hours worked to find your OSHA incident rate. Use our free OSHA TRIR Calculator to calculate your Total Recordable Incident Rate (TRIR). DIFR Calculator = Number of incidents multiplied by 200 000 hours divided by the actual number of hours worked. In a strict application, "rate" should only be used when the denominator is an estimate of the total person-time at risk. All 3 types of injuries decreased from 2018. Now, to calculate the LTIIR (Lost Time Injury Incidence Rate) which is the number of LTIs per 100 (or whatever figure you want) employees we just substitute the number of employees for the number of hours and multiply the number of LTIs by the standardizing factor which is 100. Employee Labor Hours Worked. MTI is Medical Treatment Injury (a work-related injury that requires treatment by a medical practitioner beyond first aid). The incidence rate of HD vascular access infection would therefore be 4/89 = 0. The Lost time injury frequency rate states the number of lost time injury per 1000000 man-hour, while Lost time injury severity rate explains the severity rate of every lost time injury per 1000000 man-hour. It is a useful tool that can help organizations measure and monitor their LTIR. Helps. e. = 0. Mechanical Engineering questions and answers. 1 Major Injury rate 17. The formula can also be multiplied by 1,000,000 to get the injury frequency. a year. This is in contrast to the lost time inju. (Number of DART Incidents X 200,000) / Total number of hours worked by all employees. 3. S. The formula can also be multiplied by 1,000,000 to get the injury frequency. The “Lost Time Case Rate” (LTC) is the second most commonly. Some people confuse this formula with the formula for lost time injuries, but the total recordable injury frequency rate includes all injuries requiring medical treatment from a medical professional - which in theory means that it will be a larger number. The output of this all injury frequency rate calculation is your AIFR 'score' and indicates how many injuries are suffered when standardised across 100 employee working 40 hours per week for one year. Rates Lost time injury frequency rate (LTIFR) The number of LTIs (including fatalities) per million hours worked. The first step in benchmarking is to calculate the incidence rates for your organization. au. OSHA Incident Rate Calculator" title="SMG Utilities Services. 75 Accident Incidence Rate Formula. How to Calculate the Accident Rate. There are others but I think this is what you are trying to calculate. As you can see, there are just three parts of the LTIFR formula, two of which need to be reconciled on your end, and then the 1,000,000 figure which. Next, gather the formula from above = MTI = I / HW * 1,000,000. 2 Reporting Thresholds 2. This is a true rate, because time is an integral part of the calculation, analogous to miles per hour (a rate of. The calculation is: Total fatal injuries*1,000,000,000/Total hours worked. More details can be found in our reports on the impact of the coronavirus pandemic on health and safety statistics. R. It is the goal of every organization in all industries to have a low incident rate. 25. TRIR: total recordable incident rate; N that is the Number of Recordable Injuries and/or Illnesses in One Year period; EH is the Total Number of Hours Worked by all Employees in. per 1 000 000 hours : the number of new cases of injury during the calendar year divided byyy the total number of hours worked by workers in theThat's a very important question! Your DIFR report is your Disabling Injury Frequency Rate report which examines the ratio between actual disabling injuries per million-man hours worked, expressed as a percentage. “Incidence rate” or “incidence” is numerically defined as the number of. 5. Whatever the type of injury, a high injury frequency rate within business operations must be addressed to further improve the facility’s safety program. Health and Safety Incident Management Implementation Guide. Systematic research on sensitivity of rates to the choice of the study parameters is lacking. The calculation is: Total Fatal Injuries*1,000,000,000/Total Hours Worked. Recordable Incidents x 200,000. g. 1. From the BLS Survey of Occupational Injuries and Illnesses form, if your company was surveyed for the calendar year for which incidence rates are desired—you can add the number of nonfatal recordable cases entered. Incident rate is number of incidents * 100 then this time divided by number of people. 10 2 . 2. As an example total case incident rate calculation, if a company had 2 recordable cases during the year and 1,000,000. Work shift = 10 hrs/day. The calculation is: (Total Disabling Injuries + Total Fatal Injuries)*1,000,000/Total Hours Worked. 200,000 represents 100 employees working 40 hours per week. The output of this all injury frequency rate calculation is your AIFR 'score' and indicates how many injuries are suffered when standardised across 100 employee working 40 hours per week for one year. This would equal 0. How do you calculate total recordable frequency rate? Total recordable frequency rates of various types are used throughout industries for indications of past performance and not the future forecasts. That is obviously unrealistic, especially for big companies with many employees. Result: 2 * 1 000 000 / 175200 = 11. Incidence rate calculation. 1982) = Total number of deaths during the year of 1982/U. LTIFR or the lost time injury frequency rate is a safety measure which refers to the number of lost time injuries occurring per 1 million hours worked. 7) and Star Entertainment Group (22. The incidence rate is a measure of the frequency with which a disease or other incident occurs over a specified time period. The reason for calculating an accident frequency rate is to. LTIFR. Lost time injury frequency rate (LTIFR) This KPI measures the frequency of injuries or incidents that occur over a period of time that cause lost time. S. Incidence rates pertain to the number of new injuries that occur in a population at risk over a specified time period or the number of new injuries during a period divided by the. If you multiply 3 times the 200,000 figure, you get 600,000. 82, which is an improvement on the FY21 result of 0. total number of hours worked by all employees results in the severity rate. To calculate the incidence of the same hypothetical study used above, the following information is used:. Vehicle accident rate method of calculation . Total for sectors A, C-N (refpop. Lost time injury frequency rate (LTIFR) refers to the amount or number of lost time injuries, that is, injuries that occurred in the workplace that resulted in an employee's inability to work the next full work day, which occurred in a given period relative to the total number oh hours worked in the accounting period. Absolute differences ranged from 4. The Recordable Incident Rate (RIR) is a mathematical calculation used by OSHA that describes the number of employees per 100 full-time employees that have been involved in an OSHA-recordable injury or illness. COST02 - Costs to Britain of workplace injuries and new cases of work-related ill health by incident type, 2004/05 to latest year COST03 - Costs to Britain of workplace injuries and new cases of work-related ill health by cost bearer, 2004/05 to latest year (No costs data for 2011/12 due to ill health data not collected in 2012/13)This is a 4. The calculation is based upon the number of lost time injures within a given period. Pada pembahasan ini, kita coba mengulas dan mengulangi Kembali cara-cara dalam melakukan perhitungan statistic dalam K3. 7. After reviewing and compiling your safety data, you’ve determined that there were six lost time injuries in the past year at your manufacturing company and a total of 2,500,000 hours worked. Incident rates are a metric used to compare your company’s safety performance against a national or state average. 0, with the average TRIR in construction being. Specified period = 278 days. I wrote a formula in DAX that calculates the incident rate for a given type of injury called "Recordable Injury" which is (injuries x 200,000)/Total Hours Worked. The formula for how to calculate TRIR is simple: the number of incidents, multiplied by 200,000, then divided by the total number of hours worked in a year. 7) and Star Entertainment Group (22. In epidemiology, this metric is widely used to indicate the occurrence of ailment, sickness, or an incident. The formula to calculate the Lost Time Injury Frequency Rate is as follows:. For example, if you had a total of 5 incidents and 100,000 hours worked during the time period, the IFR would be calculated as follows: IFR = (5 / 100,000) x 100,000 = 5This ex- presses accident frequency per 200,000 hours of exposure which has (presum- ably ) been chosen on the basis of: 100 persons X 40 hours/week X 50 weeks per year. Products. Total number of. The “Lost Time Case Rate” (LTC) is the second most commonly. govBy analyzing the data, the occupational accident weight rates and occupational accident frequency rates for years were determined and compared without making any sectoral discrimination. Take the number from Step 3 and divide it by the number from Step 2. The Injury Frequency Rate formula is defined as the number of disabling injuries that occurred per one lakh man hours worked. Total exposure Incidence Burden adam-lallana 6 302 43. TRIFR = { (LTI + MTI + RWI) x 1,00,000} / Hours Worked. Some people confuse this formula with the formula for lost time injuries, but the total recordable injury frequency rate includes all injuries requiring medical treatment from a medical professional - which in theory means that it will be a larger number. Injury Frequency Rate = (Number of Injuries / Total Exposure Hours) x 1,000,000 This formula will give you the injury frequency rate. 4. Number of work-related injuries × 1,000 / Average number of employees. The output of this all injury frequency rate calculation is your AIFR 'score' and indicates how many injuries are suffered when standardised across 100 employee working 40 hours per week for one year.