Find out how many workdays are lost as a result of injury or illness with the Lost Day Workday (LWD) Rate Calculator. Unlike the Lost Time Incident Rate, which determines the number of cases contributing to lost time, the Lost Workday Incident Rate takes into account the specific number of days lost to an injury or illness. Use this rate to evaluate existing safety programs, plan for new safety training, or setting a safety benchmark.
All you need to calculate Lost Workday Rate is your OSHA 300 log. 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.
What's next?
OSHA has simplified its incident rate calculations and replaced the Lost Workday Rate with Days Away, Restricted, and Transferred (DART) Rates. To improve the accuracy of incident reporting, this new metric takes into account all work time that is lost, not just the work days. If you want a more comprehensive overview of safety performance, your next step is to determine the DART Rate for your facility. Calculating DART will help you better evaluate your organization’s safety efforts and avoid surprise OSHA inspections.
Although OSHA no longer recognizes the term “lost workday” for recordkeeping purposes, it can be beneficial for safety managers and employers to monitor Lost Workday Rate. You may not even realize how many days your company is losing to accidents; understanding the true cost of safety is key to effectively improving safety programs. Lost days of work directly cost the company medical bills and worker’s compensation, but the indirect costs, like OSHA fines, decreased productivity, hiring and training a new employee, etc. can cost an organization much more.
Understanding Key Workplace Safety Metrics
Below is a comprehensive reference table of essential safety metrics that can help your organization track, assess, and improve workplace health and safety performance. From calculating your Accident Frequency Rate (AFR) to using a DART Rate Calculator for determining the Days Away/Restricted or Job Transfer Rate, each metric offers valuable insights. You’ll also find guidance on the Lost Time Injury Frequency Rate (LTIFR), the Lost Time Case Rate (LTIR), and the Lost Workday Rate (LWDR), each of which provides a clearer understanding of how incidents translate into lost work hours. Additionally, tools like a Severity Rate Calculator and methods for determining the Total Case Incident Rate (TCIR), Total Recordable Injury Frequency Rate (TRIFR), and OSHA Recordable Severity Rate (TRSR) ensure you can accurately measure the full impact of workplace incidents. By leveraging these metrics, your organization can identify safety trends, implement preventive measures, and maintain a proactive approach to hazard control.
| Name | Acronym | Definition | Formula |
|---|---|---|---|
| Accident Frequency Rate Calculator | AFR | Number of incidents resulting in lost work time due to injury or illness per 100 employees. | (Number of Accidents × 200,000) / Total Hours Worked |
| Days Away/Restricted or Job Transfer Rate | DART | Number of incidents resulting in lost work time, restricted duties, or job transfers per 100 employees. | (Number of DART Cases × 200,000) / Total Hours Worked |
| Lost Time Injury Frequency Rate | LTIFR | Number of injuries resulting in lost time per 1,000,000 hours worked. | (Number of Lost Time Cases × 1,000,000) / Total Hours Worked |
| Lost Time Case Rate | LTIR | Number of incidents resulting in lost time per 100 full-time employees. | (Number of Lost Time Cases × 200,000) / Total Hours Worked |
| Lost Workday Rate (Lost Time Injury Rate) | LWDR | Number of lost workdays due to injury or illness per 100 full-time employees. | (Number of Lost Workdays × 200,000) / Total Hours Worked |
| Severity Rate | SR | Number of lost days relative to total hours worked per 100 full-time employees. | (Number of Lost Workdays × 200,000) / Total Hours Worked |
| Total Case Incident Rate (OSHA Recordable Incident Rate) | TCIR | Number of OSHA recordable incidents (injuries and illnesses) per 100 full-time employees. | (Number of OSHA Recordable Cases × 200,000) / Total Hours Worked |
| Total Recordable Injury Frequency Rate | TRIFR | Number of fatalities, lost time injuries, restricted duty cases, and other injuries requiring medical treatment per 1,000,000 hours worked. | (Number of Recordable Injuries × 1,000,000) / Total Hours Worked |
| OSHA Recordable Severity Rate | TRSR | The average number of lost and restricted days per OSHA recordable incident. | (Number of Lost Work Days + Number of Restricted or Transferred Days) / Number of OSHA Recordable Incidents |
