For example, if you have 40 full-time employees and 3 incidents that resulted in lost time, your calculation will look like this: (3 x 200,000) / 80,000 (40 employees x 40 hours per week x 50 weeks per year) Your lost time incident rate would be 7. How to Calculate: OSHA Recordable Incident Rate. The 200,000 is the benchmark established by OSHA because it represents the total number of hours 100 employees would log in 50 weeks based on a 40-hour work week. You know the old saying about an ounce of prevention, “an ounce of prevention is worth a pound of cure!”. In contrast to prevalence, incidence is a measure of the occurrence of new cases of disease (or some other outcome) during a span of time. Medical treatment injury frequency rate is simply the rate at which medical treatment injuries have occurred over a specific period of time, usually standardised into MTI per million hours worked or per 100 full-time workers during a one year period. The formulae used to calculate the various measures of working days lost are given by: Estimated annual full-day equivalent working days lost. One of the best ways to get the most preventative bang for your buck is to hire consultants who can assess the safety and ergonomics of your workplace. Further work 36. 95 2. 39 per 100 person years with 23. Calculating your lost time injury. To calculate DART rate, you need to leverage the following equation: (The total number of missed workdays + the number of days where workers were on restricted work duty + the number of days where workers required a transfer of work duties) x 200,000 / Total hours worked by all employees. 4 7. 24 per million hours worked in 2019, 8% lower than 2018’s 0. Total nonfatal work injury and illness rates, private industry; Year Total recordable cases Cases involving days away from work, job restriction, or transfer Other recordable cases;. The Lost time injury frequency rate states the number of lost time injury per 1000000 man-hour, while. 31 compared to 1. # 1: Passion for Safety - Please no! 29 August 2019. co. Most companies choose to calculate LTIFR per 1 million man-hours worked. The rise in this figure is a good indicator of improvements to your safety. October. Before we begin, let’s clear some of the clouds when it comes to recordkeeping and lost time incidents. Association of Workers' Compensation Boards of Canada (AWCBC) 40 University Avenue, Suite 1007. A lost time incident (LTI) is an event that occurs in the workplace resulting in a worker being unable to report for work or perform their job duties. LTIFR Lost Time Injury Frequency Rate Lost-time injury frequency rates refer to the number of lost-time injuries within a given accounting period, relative to the total number of. The Federal Aviation Administration, which licensed the Starship's test flight today, just issued a statement: A mishap occurred during the SpaceX Starship OFT-2. Using this standardized base rate. More specifically, the overall lost time injury rate (LTIR) was 0. Incident investigations are often conducted by a supervisor, but to be most effective, these. The Lost Time Injury Fatality Rate calculator can now be seen on the Data website. The formula to use: (Number of lost time cases x 200,000)/total number of hours worked by employees. To. Therefore, incidence is the number of newly diagnosed cases of a disease. If you had a really good. For example, let’s imagine there were six lost time injuries in the past year at your company and a total of 2,500,000 hours worked. Contents OSHA Recordable Incident Rate by IndustryUnderstanding Total Recordable Incident RatesThe Basics of TRIR CalculationHow to Calculate OSHA Recordable Incident RateOSHA DART Calculator BasicsDART Rate CalculationsUnderstanding the Lost Time Incident Rate CalculationCalculating the Lost. a permanent disability/impairment. As an example, 'X' Construction Company might have 10 reported injuries over the course of 1,000,000 hours worked. Lost Time Accident Rate per 100 Employees measures the Bureau’s ability to reduce injuries and illnesses in the workplace. A lost time injury refers to any injury sustained on the job by an employee which results in that employee being absent from at least a full day of work. LTIFRs are useful for drawing conclusions. If you had a really good. A lost-time injury is one that resulted in time lost from work of one day/shift or more. We would like to show you a description here but the site won’t allow us. Our internal reporting system. Calculated who OSHA Incident Rate and other safety rates is a use tool for businesses to ranking the frequency of onsite wounds and illnesses. To calculate your LTIFR, simply plug those numbers into your formula: (6 x 1,000,000) / 2,500,000 to get a LTIFR = 2. HSSE WORLDWIDE. 5 have experienced lost time due to an incident. And, the overall lost time injury rate (LTIR) (fatalities and lost work day cases) was 0. If you multiply 3 times the 200,000 figure, you get 600,000. It should be considered alongside other lagging and leading indicators. 4772% (less than 2. The website delivers national work health and safety and workers’ compensation data in an intuitive, user-friendly way. Total Case Incident Rate (TCIR) or Total Case Rate (TCR) is defined as the number of work-related injuries per 100 full-time workers during a one-year period. LTIs can include anything from slip and fall accidents to serious machinery-related injuries. For those not familiar this is the annual total volume of Lost Time Injuries (LTIs) multiplied by 100,000 divided by the total hours worked. Lost Time Injury Days (LTID) is another way to record injury rates. 2) Injury Severity Rate = (No. They also include TRIR/TRIF - Total Recordable Incident Rate. 011% (19 injuries/170,000 hours worked x 100) down to 0. Incident Rate (TRIR), or the number of employees per 100 working a full year who incurred a recordable injury (something more serious than first aid) had dropped by more than 50% between 1996 and 2004. The lost time injury severity rate (LTISR) is the number of lost days due to work-related injuries per million hours worked in a given period. 2. My 10 Health & Safety Myths. 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. The DART Rate is similar to another important calculation, the Total Recordable Incident Rate (TRIR), but know that these two calculations are not the same. Number of Lost Time Cases x 200,000. In 2022, the rate of injury cases in the private sector was 2. DO YOU BELIEVE A ZERO INCIDENT RATE IS POSSIBLE? This is the central question. Suppose you had three recordable incidents during the year. Researchers found they had C. TABLE 1. Ontario’s workplaces are becoming safer. It could be as little as one day or shift. 7 person-yrs. Where the TRIR considers all injuries and illnesses, the LTC Rate represents solely the number of cases that resulted in lost workdays. (b) The number of hours all employees actually worked. It is an indicator of the state of health and safety at a workplace. The formula is given as: (Number of lost-time injuries in the accounting period x 1,000,000) / (Total hours worked in the accounting period) To make it. To calculate an organization’s DART incident rate, simply add up the number of recordable injuries or illnesses which led to days away, restricted, or transferred and multiply it by 200,000. The Lost Time Incident Rate is calculated similarly to the TRIR metric we recently discussed. 4: If you require information that is not in the NWISP reports, AWCBC can produce customized lost time injury, disease, and fatality data on request. For example, if you recorded 2 incidents, then the number is 2*200,000 or 400,000. =. The Lost Time Incident Rate (LTIR) is a crucial metric in occupational health and safety, providing insights into the frequency of lost time incidents within a specific. Divide by the result by the total number of hours worked. A single injury or illness has a much greater effect on incidence rates in small establishments than on larger establishments. For example, a company that discloses lost-time injury rates needs to be judged based on this disclosure. 4 . The definition of L. Dissemination 21 10. Amazon's 2020 injury rates were higher than Walmart, one of its closest retail competitors. For the purpose of this policy, impairment plus a loss of earning capacity refers to disability in pre-1990 claims. The injury severity rate represents the number of lost work days experienced per 100 workers. Please visit the website and fill out the short online questionnaire. The illness rate in 2022 was 45. The only problem with this is that none of these lagging. News Lost time injury frequency rate calculator. gov. Definition. Using this standardized base rate. This comparison is a safety benchmark to gauge performance with other companies in the same business group, so you can make an “apples to apples” comparison. Transportation and Warehousing = 4. If you're ever in doubt, you should reach OSHA instantly to explain the circumstances of the incident. A Lost Time Injury is a work injury or disease where the injured party has. Health, Safety, Security and Environment. 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. 5 0. # 1: Passion for Safety – Please no! 29 August 2019. Skip on topics. The severity rate for this company would equal 1 days per incident - so on average, each incident results in one day off work. Table 8: Number of man-days lost to workplace incidents in selected industries, 2021-2022 . Total recordable incident rate (TRIR) is one of many safety indicators used to evaluate the effectiveness of a company’s safety efforts. Association of Workers' Compensation Boards of Canada (AWCBC) 40 University Avenue, Suite 1007. Most companies choose to calculate LTIFR per 1 million man-hours worked. This number equates to 100 employees, who work 40 hours per week, and who work 50 weeks per year. LTIFR calculation formula. Research suggests that there are predictable ratios or 'accident triangles' which describe the relationship between lost time injury rates and the incidence of events such as minor injuries and non-injury accidents 3. AMPERE lost zeitpunkt accident is an incident resulting in on associate supported an injury, while lost time traumatic are the physical or mental damage leading to the employee being leave from work. If a worker is able to report their workplace but must be given work other than their normal duties because of an injury, this is considered a restricted workday rather than a lost workday. The result reflects that the company has 3. Non-fatal accidents rate in EU countries and Japan (2011-2020) Fatal accidents rate in EU countries and Japan (2011-2020) Statistics on safety and health at work in ILOSTAT. The participating IOGP member companies reported 703 lost. LTIFR = (14 / 800,000) = 0. An LTIFR of 7, for example, shows that 7 lost time injuries occur on a worksite every 1 million man-hours worked. Improving at small percentages over time is the best option. For companies with higher levels of ESG disclosure, data providers need to make a judgment about whether the disclosure constitutes good or bad performance. The figure 200,000 is a standard number to measure incident rates so companies of varying sizes can be compared fairly. 5 cases for every 100 workers, according to the study. Lost Time Incident Rate (LTIR): LTIR refers to the number of injuries and illnesses that result in at least one day away from work. A lost time injury is an injury sustained on the job by worker that results in the loss of productive work time. is the number of Lost Time Injuries multiplied by 1 million divided by the number of manhours worked in the reporting period. 29 1. LTIFR will typically be calculated for a specific workplace or. T. Overview of Lost Time Injury Rate. 05/10/2023 . To calculate your LTIFR, simply plug those numbers into your formula: (6 x 1,000,000) / 2,500,000 to get a LTIFR = 2. Lost Workday Case Incidence Rate (LWIR): Number of days lost due to nonfatal injuries and/or work-related illnesses per 100 full-time employees. 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. 8 million injury and illness cases in private industry, up 7. Most companies choose to calculate LTIFR per 1 million man hours worked. 4 per 100,000 FTE in 2020. Here are some benchmarks: A perfect TRIR is 0, the product of zero employee accidents/incidents. An incidence rate of injuries and illnesses may be computed from the following formula: (Number of injuries and illnesses X 200,000) / Employee hours worked = Incidence rate. 6: 2. These three trailing indicators can provide some good insights: TRIR (Total Recordable Incident Rate) DART (Days Away, Restricted or Transferred) EMR (Experience Modification Rate) Like a report card, trailing indicators, also known as lagging indicators, measure your safety performance based on past incidents or conditions. A lost-time injury is one that resulted in time lost from work of one day/shift or more. (If actual hours worked are not available for employees paid on commission, by salary, by the mile,Safety Lagging Indicators. Telephone Toll-Free: 1-855-282-9222 or 416-581-8875. Overview of Lost Hour Incident Rate and its CalculatorA company that has only 100,000 labor hours, for example, would incur a frequency rate of 2. 4. A recordable incident rate, also known as Total Recordable Incident Rate (TRIR), is the number of incidents which have occurred on-site, usually within a year, according to a certain number of hours worked by 100 employees. Construction = 3. 35 • Total Recordable Incident Rate = 2. The total hours worked in this period (for all employees) was 800,000. 5 have experienced lost time due to an incident. For example, let’s imagine there were six lost time injuries in the past year at your company and a total of 2,500,000 hours worked. To calculate the incidence rate, we use this incidence rate calculator: Total number of new cases = 1; and; Total population at risk = 50,000. Here are some notes regarding the DART rate formula: The. 44 15. 11 Lost-time. The Lost Time Injury Rate (LTR) increased by approximately 20% and the Recordable Injury Rate (RIR) remained relatively flat. 6: 1. of employees who lost time due to an incident. Lost Time Injury – any injury sustained by an employee while on the job that prevents them from being able to perform their job for at least one day/shift. Both the lost time injury frequency rate and the lost time injury severity rate have its significance. An LTIFR of 7, for example, shows that 7 lost time injuries occur on a jobsite every 1 million hours worked. 0 with only one lost time incident. Lost time incidents are accidents that occur when a worker sustains a lost time injury (LTI) that results in time off from work, or loss of productive work (absenteeism or delays). 22, unchanged compared with 2020. The formula gives a picture of how safe a workplace is for its workers. The basic formula is (N x 200,000)/EH, or the. A lost time injury (LTI) is something that results in a fatality, permanent disability, or time lost from work. This number equates to 100 employees, who work 40 hours per week, and who work 50 weeks per year. Overview of Lost Time Incident Rate additionally own NumericThe injury severity rate is a number calculated by dividing the total number of lost workdays by the total number of recordable accidents. Since 2019, our workforce has more than doubled in size, growing nearly 140%. 5 percent from 2021. We are constantly refining and enhancing our requirements and training. Use them as general benchmarks for your own organization’s performance. 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. Total number of hours worked by all employees. Health, Safety, Security the Environment. From 2019 to 2022, we saw our recordable incident rate improve by almost 24%. The Lost Time Case Rate, also referred to as LTC Rate,. The Lost Time incident Rate of a company gives workers, carriers, and stakeholders an indication of how safe to company’s practices are. When it comes to safety KPI metrics, lagging indicators such as TRIR, DART, Lost Work Day Case Rates and the number of recordables (compared to a previous time in history) have been widely used to try and show the overall health of a safety program. How is LTIF rate calculated? Calculating Lost Time Injury Frequency Rate – Measuring your LTIFR is actually easier than you think. Related to Lost Time Injury Rate Defects Liability Period means the warranty period following the taking over, during which the Contractor is responsible for making good, defects and damage in Goods and Services provided. This includes injuries resulting in fatality or permanent disability. Divide the total number of lost time injuries in a certain time period by the total number of hours worked in that period, then multiply by 200,000 to get the LTIR. An LTIFR of 7, for example, shows that 7 lost time injuries occur on. TRIR calculations reflects the number of recordable injuries per 100 full-time workers during a one-year period. Total Recordable Incident Rate (TRIR) Days Away or Transferred (DART) Lost Time Incident Rate (LTIR) Leading Indicators. . The figure 200,000 is a standard number to measure incident rates so companies of varying sizes can be compared fairly. Environmental Protection. LTIFR will typically be calculated for a specific workplace or project, but it can also be expanded to measure safety in specific regions or industries as well. One Lost Time incident Rate of a company gives employees, insurers, and stakeholders on indication of how security the company’s practices are. In addition to measuring your lost time injury frequency rate, be sure to consider things like: Injury severity How to calculate lost time incident rate. Health, Security, Security and Environment. Let's illustrate the LTIR calculation! Here's the formula and all you need to know about this key OSHA surf metric. 39 (construction average is 3. 4. The lost time injury frequency rate industry average depends on the specific industry. Number of recordable incidents (injuries and illness) per 100 full-time employees. 5M. Lost Time Injury Days (LTID) is another way to record injury rates. The severity rate for this company would equal 1 days per incident - so on average, each incident results in one day off work. Lost time incidents are accidents that occur when a worker sustains a lost time injury (LTI) that results in time off from work, or loss of productive work (absenteeism or delays). There are a number of ways that you can reduce the amount of lost time at your business. Incident Management restores normal service operation while minimizing impact to business operations and maintaining quality. As the name implies, the injury severity rate attempts to measure how critical the injuries and illnesses experienced by a certain group of employees (in a given workplace or across an entire industry) by using the number of days lost as a. The comparable average injury rate for all miners interviewed was 5. The TRIR is a percentage rate of recordable incidents per 100 employees. Skip to show. This includes injuries resulting in fatality or permanent disability. a permanent disability/impairment. 33 lost time injuries for every one million man-hours worked. Get Catalog | Get Free Samples. au. The estimated number of full-day equivalent working days lost due to workplace injury (excluding injuries caused by road accidents) and/or work-related illness for people employed in the 12 month. Health care and social assistance = 3. Total number of hours worked by all employees. How to calculate lost time incident rate. Examples are lost-time injury rates, modified work injury rates and disability injury rates. To take this into account, OSHA have stated that small businesses can use a three-year incident aggregate. 1. This could be a week, a month, or a year, depending upon the frequency of your KPI reporting. To calculate. The Lost time injury frequency rate (LTIFR) calculator is a data tool that helps you compare one aspect of the work health and safety performance of your organisation against industry benchmarks. 9% in 2022. Incident investigations that focus on identifying and correcting root causes, not on finding fault or blame, also improve workplace morale and increase productivity, by demonstrating an employer's commitment to a safe and healthful workplace. LTIFR will typically be calculated for a specific workplace or project, but it can also be expanded to measure safety in specific regions or industries as well. 24, 8% lower than 2018 (0. LTIFR = (14 / 800,000) = 0. 03 in 2019. Zero lost time accidents for ADCO For an environmental, health and safety manager, one of the most important metrics of safety performance is the lost time incident rate (LTI). In some organizations, graphing key safety metrics over time often reveals a series of peaks and valleys in actual safety performance. 68 as compared to 4. An injury is considered an LTI only when the injured worker: Is unable to perform regular job duties. 5M. 5, which. Two things to remember when totaling. Lost time injury frequency rates. The Lost Date incident Rate of a company gives employees, insureds, and stakeholders an indication the how safe the company’s practices are. To put it into perspective: Total Recordable Incident Rate (TRIR): A TRIR of 1. 1 percent to 460,700 cases in 2022. The fatal work injury rate was 3. In many countries, the figure is typically calculated per million hours worked. Recordable Incidents x 200,000. Guidelines. 0 0. Your Lost Time Incident Rate would be 7. We would like to show you a description here but the site won’t allow us. A 'good' or low DART may highlight improvements in site or workplace safety, while an increasing. It is a workplace injury or illness that results in an employee being unable to perform their regular job duties for at least one full working day following the incident. It could be as little as one day or a shift off work being lost, or months of rehabilitation. The index is calculated in Eq. Using this standardized base rate. For the purpose of this policy, impairment plus a loss of earning capacity refers to disability in pre-1990 claims. Lost Time Injuries 1. The intent of the measure is to measure the proportion of covered workers who had a lost time claim. HTML. 5, which means that for every 100 employees, 7. The company is a member in good standing. Other similar terms include “lost time. 2 2. The Total Recordable Injury Rate (TRIR) in the US is at an all-time low. Incident rate (per 100 employees) Agriculture, forestry and fishing: 2. The formulae used to calculate the various measures of working days lost are given by: Estimated annual full-day equivalent working days lost. Feedback can also be emailed to statsonline@swa. 7% reported more than 14 days off work, and 15% led to. The formulae used to calculate the incidence estimate and rate of over 3-day absence injury relating to individuals working in the last 12 months for overall and individual characteristics such as age and sex are given by: Incidence of over-3-day absence injury. The website delivers national work health and safety and workers’ compensation data in an intuitive, user-friendly way. Industry benchmarking. TRIR calculates the total amount of recordable incidents within a. 00006 by 200,000. It provides an idea about the organization’s efforts to protect the workers from work related hazards. 0 or under as the average TRIR across the board was 3. How To Reduce Lost Time Injury Rates. Simply enter the number of days lost to injury or illness and plug in the total number of hours worked by all employees to find your facility’s Lost Workday Rate – the rate of days lost on average for every 100 employees. No wonder it’s becoming more and more difficult to engage your workforce in safety training. From payroll or other time records. 25/06/2023 . They started playing football as kids, began to suffer mentally and died before 30. Incidence rates. 92 injuries per million hours worked. 0006% (1 injury/170,000 hours worked x100 ) over four years. 1-866-777-1360 M-F 6am - 4:30pm PST. 91 in 2012, 5. 26). Rate = 200,000 * Rec. 71 compared to 27. An incidence rate is the number of events that happened over a given period time by a standardized number of employees (usually lower than the standardized number of hours). Multiply the sum of this by 200,000. Divide that by 80,000, and you’ll get a recordable incident rate of 7. Calculate Injury/Illness Rates. As you can see from the above formula and calculation, a low severity. As measurements of past performance orlagging indicators, they are very useful in assessing your current safety system. For example, if you have 40 full-time employees and 3 incidents that resulted in lost time, your calculation will look like this: (3 x 200,000) / 80,000 (40 employees x 40 hours per week x 50 weeks per year) Your lost time incident rate would be 7. TRIR = 6 x 200,000 / 500,000. assesses the worker’s risk of an injury or illness, if they worked during a one-year period. TRIFR can sometimes be used interchangeably with the lost time injury frequency rate, but it is different in that it includes other types. 99 in 2018). We would like to show you a description here but the site won’t allow us. What is a good lost zeit event rate? Ideally, you want your LTIR to be as blue while possible, but, realistically, the best path on. Lost Time Injury Frequency Rate (LTIFR) • Is a principle measure of a safety performance in many companies and it has two main component 1. Then, the number is multiplied by 200,000 to make it easier to use and interpret. 3: 0. The Lost Time Case Rate, also referred to as LTC Rate, is a standard workplace safety metric like OSHA’s Total Recordable Incident Rate. 09 in 2019. Ave. The severity rate calculation from here would be: Severity rate = (25 lost work days x 200,000) / 2,000,000 hours worked = 1 lost day per accident. This. (Total number of incidents or illnesses resulting in either the worker missing work, being on restricted duty, or being transferred to another job within the organization x 200,000) The total number of hours worked by all employees. 4) OSHA Rec. A recordable incident is any work-related injury and illness that result in death, loss of consciousness, days away from work, restricted work activity, transfer to another job, or medical treatment beyond first aid. Call 0800 000 267 for a welcoming chat, or email simon@safetypro. Two things to remember when totaling your annual. The OSHA Total Case Rate (or Total Recordable Injury Rate) is calculated by multiplying the number of OSHA recordable cases by 200,000, and then dividing that number by the number of employee labor hours at the company. If the employee has the following day off, then the injury is classified as a lost time injury. Overview of Lost Time Incident Ratings and its CalculatorA simple formula for calculating accident incidence (frequency) is to: Take the total number of recordable incidents for the year from your OSHA 300. R. 4 in 1996. Your DART rate is an indicator of how safe your work environment is, which impacts your Experience Modification Factor — a major factor in determining work comp premiums. The use of. It’s important to investigate all incidents Incident Rate = 6. Incident rates such as LTIR indicate not just the number of incidents that have occurred but also how severe they were. What Does Lost Time Injury Incidence Rate (LTIIR) Mean? Lost time injury incidence rate (LTIIR) refers to the number of lost time injuries relative to the number of employees calculated over a specified time period. 1 Performance data is based on a combination of measured and estimated data using reasonable efforts and collection methods. The definition of L. 2 cases per 10,000 full-time equivalent workers compared to 37. Similar to my employee who thought injuries come with the job. · The total for columns K & L are. 77, 10% higher than in 2020 (0. ([Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the. The total recordable injury rate (recordable injuries per million hours worked) followed a similar trend, decreasing to 3. 5. The total number of lost time injuries in a given period is divided by the total number of hours worked in that period. As a result of these initiatives we have seen incident rates reduce to around 20–30 per year in comparison to 2014, when 81 reported incidents were linked to machine safety. 38 1. :1. Severity rate = Man days Reportable lost due to lost time injury × 1 000 000 / Man - hours worked. Most companies choose to calculate LTIFR per 1 million man hours worked. LTIR (Lost Time Incident Rate) LTIR is calculated by the number of lost time cases x 1,000,000 then divided by the total hours worked. The formula for calculating Lost Time Injury Frequency Rates is very simple. The LTIIR differs from the LTIFR in that the LTIFR calculates the number of LTIs over a given time frame relative to the total. 1. 5 have experienced lost time due to an incident. Our accident calculator uses the following incidence rate formula: TRIR = (Number of recordable injuries × 200000) / Hours worked. Feedback can also be emailed to [email protected] recordable incident rate, also known as Total Recordable Incident Rate (TRIR), is the number of incidents which have occurred on-site, usually within a year,. As with other episode rates, a good Lost Time Failure Rate is one that is as vile because likely. The estimated number of full-day equivalent working days lost due to workplace injury (excluding injuries caused by road accidents) and/or work-related illness for people employed in the 12 month. Strategize to Reduce Lost Time Accidents on Site Strategies should be in place prior to the commencement of any works. The severity rate calculation from here would be: Severity rate = (25 lost work days x 200,000) / 2,000,000 hours worked = 1 lost day per accident.