Table of Contents

## How is accident rate calculated?

An accident rate is calculated by multiplying the number of recorded incidents by 200,000, and then dividing that number by the number of work hours in the organization.

**How is injury severity rate calculated?**

Injury severity rate can be calculated by the following formula: Injury severity rate = (number of work days lost + light duty days lost) x 200,000 / total hours worked.

**How is OSHA LTI calculated?**

Divide your total number of lost time injuries (in a given time period) by the total number of hours worked (in that period). 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 approximately one year).

### How do you calculate injury rate frequency?

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.

**What is disabling injury severity rate?**

The DISR report is your Disabling Severity Frequency Rate report which examines the physical absence from the workplace as a result of incidents. As with the DIFR report, this can be a very useful tool which you can use to establish lost time in the workplace as a result of incidents.

**What is the accident severity rate?**

Accident Severity Rate (ASR): Total number of Crown Estate employee lost days / total hour worked x 1000: Number of employees lost days per 1000 hours worked – (any lost days from 1 – 180) relating to direct employees only including absence relating to accidents.

#### How is LTI calculated in safety?

Data regarding the number of hours worked over the period can be obtained from your company’s payroll department. Then, multiply the number of Lost Time Injuries by 1,000,000 and then divide the result by the number of hours worked. The result obtained is the LTIFR.

**How do you calculate hours worked for OSHA?**

Total Hours Worked

- Determine your number of full-time employees over the course of the year.
- Multiply your number of full-time employees by the number of hours worked by said employees.
- Add to this number any overtime hours.

**What are the limitations of the Nosa data?**

No details are collected about the severity of injury, for example whether an accident resulted in one day off work or death, the cause of injury, the location of injury, etc. Further, the NOSA data are limited only to 4 727 out of a total of 60 196 industrial enterprises.

## What does DIFR stand for in HSE?

HSE QUALIFYING CRITERIA APPLICABLE TO GRADING OUTCOMES Star grading EFFORT % DIFR % Safety Health Environment Disabling Injury Frequency Criteria (Rate) Disabling Illness Frequency Criteria (Rate)

**How do you calculate LTIFR?**

Multiply the number of LTIs by 1 000 000 and divide the result by the number of hours worked and there you have it – the LTIFR. To show it using numbers. Say there were 7 LTIs in the past year and 2 451 679 hours worked. So, 7 X 1 000 000 = 7 000 000. Divide that by 2 451 679 and you get 2.86 – go on, grab your calculator and try for yourself.

**How is the first aid treatment frequency rate calculated?**

The first- aid treatment frequency rate is based on the total number of first-aid treatment cases which occur during the period of exposure.