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Injury Severity Rate defines the number of days lost time due to injury for 1000 man hours worked. Check FAQs
Ri=Dl⋅1000Nmh
Ri - Injury Severity Rate?Dl - Lost Days?Nmh - Man Hour?

Injury Severity Rate Example

With values
With units
Only example

Here is how the Injury Severity Rate equation looks like with Values.

Here is how the Injury Severity Rate equation looks like with Units.

Here is how the Injury Severity Rate equation looks like.

18Edit=45Edit⋅10002500Edit
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HomeIcon Home » Category Engineering » Category Civil » Category Construction Practice, Planning and Management » fx Injury Severity Rate

Injury Severity Rate Solution

Follow our step by step solution on how to calculate Injury Severity Rate?

FIRST Step Consider the formula
Ri=Dl⋅1000Nmh
Next Step Substitute values of Variables
∴ Ri=45⋅10002500
Next Step Prepare to Evaluate
∴ Ri=45⋅10002500
LAST Step Evaluate
∴Ri=18

Injury Severity Rate Formula Elements

Variables
Injury Severity Rate
Injury Severity Rate defines the number of days lost time due to injury for 1000 man hours worked.
Symbol: Ri
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Injury Severity RateOpen Variable
Lost Days
Lost Days defines the umber of days lost due to injury occurred.
Symbol: Dl
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Lost DaysOpen Variable
Man Hour
Man Hour is used to measure the efforts needed to complete a task. 1 man hour is work completed in an hour of uninterrupted effort by an average worker.
Symbol: Nmh
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Man HourOpen Variable

Other Formulas to find Injury Severity Rate

​Go Severity Rate given Injury Index
Ri=II⋅1000In⋅Ir

Other formulas in Construction Safety Management category

​Go Injury Frequency Rate
Ir=In⋅100000Nmh
​Go Number of Disabling Injuries given Frequency Rate
In=Ir⋅Nmh100000
​Go Number of Man-Hour Worked given Frequency Rate
Nmh=In⋅100000Ir
​Go Number of Days Lost given Severity Rate
Dl=Ri⋅Nmh1000

How to Evaluate Injury Severity Rate?

Injury Severity Rate evaluator uses Injury Severity Rate = Lost Days*1000/Man Hour to evaluate the Injury Severity Rate, The Injury Severity Rate formula is defined as a safety metric which companies use to measure how critical the injuries sustained in a period of time where by using the number of lost days (on average) per accident as a proxy for severity. Injury Severity Rate is denoted by Ri symbol.

How to evaluate Injury Severity Rate using this online evaluator? To use this online evaluator for Injury Severity Rate, enter Lost Days (Dl) & Man Hour (Nmh) and hit the calculate button.

FAQs on Injury Severity Rate

What is the formula to find Injury Severity Rate?
The formula of Injury Severity Rate is expressed as Injury Severity Rate = Lost Days*1000/Man Hour. Here is an example- 18 = 45*1000/2500.
How to calculate Injury Severity Rate?
With Lost Days (Dl) & Man Hour (Nmh) we can find Injury Severity Rate using the formula - Injury Severity Rate = Lost Days*1000/Man Hour.
What are the other ways to Calculate Injury Severity Rate?
Here are the different ways to Calculate Injury Severity Rate-
  • Injury Severity Rate=Injury Index*1000/(Number of Disabling Injuries*Injury Frequency Rate)OpenImg
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