Severity Calculator
Calculate the severity of risks by combining impact and probability.
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Table of Contents
Severity Formula
Severity is calculated by multiplying the impact of a risk by its probability of occurrence.
Where:
- Impact is a value between 0 and 1
- Probability is a value between 0 and 1
- Severity will also be between 0 and 1
How to Calculate Severity
To calculate severity, follow these steps:
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1Assess the potential impact of the risk (0 to 1)
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2Determine the probability of occurrence (0 to 1)
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3Multiply impact by probability to get severity
Interpreting Severity Scores
Understanding what severity scores tell you:
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1High Severity (0.7-1.0):
Critical risks requiring immediate attention and mitigation.
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2Medium Severity (0.3-0.7):
Significant risks that should be monitored and managed.
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3Low Severity (0-0.3):
Minor risks that may be acceptable or require minimal attention.
Practical Examples
Example 1 High Risk Project
A project with high impact (0.9) and high probability (0.8).
Impact = 0.9, Probability = 0.8
Severity = 0.9 × 0.8 = 0.72
This indicates a high severity risk requiring immediate attention.
Example 2 Medium Risk Project
A project with medium impact (0.6) and medium probability (0.5).
Impact = 0.6, Probability = 0.5
Severity = 0.6 × 0.5 = 0.30
This indicates a medium severity risk that should be monitored.
Example 3 Low Risk Project
A project with low impact (0.2) and low probability (0.3).
Impact = 0.2, Probability = 0.3
Severity = 0.2 × 0.3 = 0.06
This indicates a low severity risk requiring minimal attention.