# Industrial Health and Safety/Frequency rate & Severity Rate

Question
Resp sir,

In my company 2 loss time accident happens and due to this 1 hrs , 30 minutes was loss. so my question is How to calculate Frequency rate and Severity rate /month. the total man hours / month is 20000.
and man works 8 hrs/ day.

Lenindra,
If you are using the U.S. OSHA standard for loss time, the day the injury occurred is not considered a loss time. The loss or any restriction begins the following day. If the two employees spoke of in your example were out 1 hrs , 30 minutes the day of the incident but returned to work it is not counted as a loss. If you or a physician or other licensed health care professional recommended a work restriction, then day 1 does not start until the following day.

The frequency rate formula is
N × 200,000 ÷ EH

N = number of injuries and illnesses, or number of lost workdays.
EH = total hours worked by all employees during a month a quarter, or fiscal year.
200,000 = base for 100 full-time equivalent workers (working 40 hours per week, 50 weeks per year).

In regard to severity rate the formula is:
N × 200,000 ÷ EH

N = number of loss time workdays.
EH = total hours worked by all employees during a month a quarter, or fiscal year.
200,000 = base for 100 full-time equivalent workers (working 40 hours per week, 50 weeks per year).

Using the information you provided, providing they meet the definition I provided:

Frequency (Loss time) = 2 × 200,000 ÷ 2000 = 200

Severity = 0 × 200,000 ÷ 2000 =  0

I would recommend that you confirm that you meet the definition to verify the correctness.

Industrial Health and Safety

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