Every injury has a price, and one of the biggest costs is missing time. A worker who is away is a worker who is not producing, and someone else has to cover the gap. The lost workday rate puts a number on that loss.
Add your lost workdays and hours worked to the calculator to see your rate.
What is the lost workday rate?
The lost workday rate shows how many workdays were lost to work injuries and illnesses for every 100 full-time workers in a year. Where the lost time case rate counts how many cases there were, this one counts how many days those cases cost you.
The lost workday rate formula
Lost workday rate = (Number of lost workdays x 200,000) / Total hours worked
As with other OSHA-style rates, 200,000 hours equals 100 full-time workers over one year.
Worked example
A packaging plant had 60 lost workdays in a year, across several injuries. Its team worked 500,000 hours.
Lost workday rate = (60 x 200,000) / 500,000 = 12,000,000 / 500,000 = 24
So for every 100 full-time workers, the plant lost about 24 workdays to injury. If the next year it loses 30 days over 520,000 hours, the rate goes up to 11.5. Even though days increased by half, the rate shows it in proportion to hours worked.
Why productivity matters
Safety is often talked about as a duty. It is also a business matter. Lost days mean overtime for other workers, temporary staff, slower output and missed deadlines. When you can show a manager that the plant lost 24 workdays per 100 workers, the case for prevention becomes easier to make.
What counts as a lost workday?
Usually it is a day the person was scheduled to work but could not, because of a work-related injury or illness. The day of the injury is normally excluded. Some organisations count calendar days and others count scheduled working days. Decide once, write it down and use it every time.
How to read your result
- A rising rate with the same number of injuries means the injuries are getting more serious.
- A falling rate may mean faster recovery, better medical follow-up or good return-to-work plans.
- One very long absence can dominate the figure, so always check the details.
Ways to reduce lost workdays
- Give first aid and medical help quickly.
- Keep in touch with the injured worker during recovery.
- Offer safe light duties when a doctor agrees, so recovery is supported.
- Fix the cause fast so the same injury does not repeat.
Related rates
For the number of cases behind the days, use the lost time case rate. For a version with a different base, try the severity rate.
Common mistakes
- Counting weekends or rest days as lost workdays when your rule says scheduled days only
- Forgetting days that carry over into the new year
- Using paid hours that include holidays
- Not stating the base in your report
Putting a cost on lost workdays
Here is a simple way to explain the number to managers. Suppose one lost workday costs your business Rs 10,000 in cover, overtime and lost output. That figure is only an example, so use your own. If your plant lost 60 days last year, that is Rs 600,000. Reduce the days by a third and you save Rs 200,000, without counting medical costs or insurance. Numbers like this get attention.
Step by step
- Count the workdays lost in the period.
- Add up the total hours worked.
- Multiply the days by 200,000.
- Divide the result by the hours.
- Compare with last period and write down the reasons for any change.
Using the rate in return-to-work planning
The fastest way to cut lost workdays is often not a new rule. It is a better return-to-work plan. Ask the doctor what the person can do, not just what they cannot. Agree light tasks, set a review date and keep in touch. People who feel supported usually come back sooner and stay safer, and your lost workday rate shows it.
Frequently asked questions
What is a good lost workday rate?
It depends on the industry. Compare with similar businesses and with your own past results.
Is it the same as the severity rate?
They are very close. The lost workday rate usually uses a 200,000 hour base, while severity rates often use 1,000,000. Check your own definition.
Do restricted days count as lost?
Usually they are counted separately as restricted workdays.
Does the injury day count?
Normally not. Counting starts from the next scheduled day.
How can I show this to management?
Pair the rate with the cost of lost production. Seeing days and money together often gets attention.
Learn this properly
Measuring the cost of injuries is covered in NEBOSH, IOSH and OSHA courses. ISH Institutes teaches these in Peshawar. Chat with us on WhatsApp and we will help you pick the right course.