5x5 Risk Assessment Matrix Tool for JHA and HIRA
Use this interactive 5x5 risk assessment matrix to evaluate workplace hazards. Assign likelihood and severity ratings to calculate risk scores and determine priority levels for control measures.
Risk Score = Likelihood (1-5) x Severity (1-5), for a score of 1 to 25.
Find the row for likelihood and the column for severity; the cell where they cross is the risk level. Scores 1-4 are Low, 5-9 Medium, 10-16 High, and 17-25 Critical: stop work and control the hazard before continuing.
Risk Assessment Matrix
Describe the hazard and select likelihood and severity ratings to calculate the risk score and level. This tool uses a standard 5x5 matrix to prioritize hazards for control implementation.
How It Works
Risk Score = Likelihood x Severity (1-25). The matrix color-codes levels: Green (Low), Yellow (Medium), Orange (High), Red (Critical). Use to prioritize safety actions.
What Is a 5x5 Risk Matrix?
A 5x5 risk matrix is a grid that crosses likelihood (1-5, from Rare to Almost Certain) with severity (1-5, from Negligible to Catastrophic). Multiplying the two ratings produces a risk score from 1 to 25, which is grouped into Low, Medium, High, and Critical bands to prioritize control actions. The 5x5 layout is an industry convention rather than a single OSHA-mandated table: each organization defines its own thresholds and band ranges.
| Likelihood Rating ↓ / Severity Rating → | Severity Rating (1-5) | ||||
|---|---|---|---|---|---|
| 1 Negligible | 2 Minor | 3 Moderate | 4 Major | 5 Catastrophic | |
| 5 Almost Certain | 5 | 10 | 15 | 20 | 25 |
| 4 Likely | 4 | 8 | 12 | 16 | 20 |
| 3 Possible | 3 | 6 | 9 | 12 | 15 |
| 2 Unlikely | 2 | 4 | 6 | 8 | 10 |
| 1 Rare | 1 | 2 | 3 | 4 | 5 |
Risk Score = Likelihood x Severity. Columns are severity (1-5) and rows are likelihood (5 at top down to 1 at bottom).
HIRA 5x5 Matrix
HIRA (Hazard Identification & Risk Assessment) uses exactly the same 5x5 scoring: identify a hazard, rate its likelihood and severity, multiply for the risk score, and assign a band. The grid above is therefore also a HIRA 5x5 matrix; the difference is in the process (HIRA is the broader identify-assess-control workflow), not in the matrix itself.
How to Score Likelihood and Severity
Consistent scoring is what makes a 5x5 matrix reliable. Use these scales as a starting point and adapt them to your operation; what matters most is that the whole team applies the same definitions.
Likelihood Scale (1-5)
- Rare (1)
- May occur only in exceptional circumstances
- Unlikely (2)
- Might occur at some time
- Possible (3)
- Should occur at some time
- Likely (4)
- Will probably occur in most circumstances
- Almost Certain (5)
- Expected to occur in most circumstances
Severity Scale (1-5)
- Negligible (1)
- No injury or minor damage
- Minor (2)
- First aid injury, minor damage
- Moderate (3)
- Medical treatment, moderate damage
- Major (4)
- Serious injury, major damage
- Catastrophic (5)
- Fatality, permanent disability
Worked Examples by Task Type
These examples show how an assessment flows: hazard → likelihood x severity = score → risk band → control. The values are illustrative; score each task against your own real conditions.
| Task | Hazard | L x S = Score | Band | Control |
|---|---|---|---|---|
| Construction: working at height | Fall from scaffold | 3 × 5 = 15 | High | Guardrails, fall arrest, and a working-at-height permit |
| Warehouse: forklift operation | Pedestrian struck by forklift | 4 × 5 = 20 | Critical | Segregated walkways, mirrors, and pedestrian exclusion zones |
| Maintenance: equipment servicing | Unexpected energy release | 2 × 4 = 8 | Medium | Lockout/tagout (LOTO) procedure and zero-energy verification |
| Office: desk-based work | Repetitive strain injury (ergonomics) | 3 × 2 = 6 | Medium | Ergonomic assessment, adjustable equipment, and active breaks |
Understanding the Risk Assessment Matrix
The 5x5 Risk Matrix Explained
The risk assessment matrix is a simple yet powerful tool for qualitative risk evaluation. By multiplying likelihood by severity, it provides a numerical score to prioritize hazards and allocate resources effectively.
Risk Score Calculation:
Score = Likelihood x Severity
Scores 1-4: Low (Monitor); 5-9: Medium (Review); 10-16: High (Act); 17-25: Critical (Stop).
Likelihood Ratings
- Rare (1): May occur only in exceptional circumstances
- Unlikely (2): Might occur at some time
- Possible (3): Should occur at some time
- Likely (4): Will probably occur in most circumstances
- Almost Certain (5): Expected to occur in most circumstances
Severity Ratings
- Negligible (1): No injury or minor property damage
- Minor (2): First aid injury, minor equipment damage
- Moderate (3): Medical treatment, moderate damage
- Major (4): Serious injury, major damage
- Catastrophic (5): Fatality, permanent disability, catastrophic damage
Using the Matrix in Safety Programs
Integrate the risk matrix into JHA, incident investigations, and safety audits. It complements quantitative methods and helps communicate risks to management and workers.
- Low Risk: Routine controls, periodic review
- Medium Risk: Enhanced controls, training
- High Risk: Engineering controls, immediate action
- Critical Risk: Eliminate hazard, stop activity
Benefits of Risk Matrix Assessments
- Systematic Evaluation: Standardizes hazard assessment across the organization.
- Priority Setting: Focuses resources on high-risk hazards first.
- Communication Tool: Visual matrix helps explain risks to stakeholders.
- Compliance: Supports OSHA VPP and ISO 45001 requirements.
- Continuous Improvement: Track risk reductions after control implementation.
- Team Involvement: Engages workers in identifying and rating risks.
Advanced Risk Assessment Tips
- Multiple Hazards: Assess each hazard separately for complex tasks.
- Residual Risk: Re-assess after implementing controls.
- Team Consensus: Use group discussion to determine ratings.
- Documentation: Record assessments in JHA or safety reports.
- Review Frequency: Re-evaluate when processes or conditions change.
- Integration: Link to hierarchy of controls for action planning.
Limitations of Qualitative Matrices
- Subjectivity: Ratings depend on assessor experience; use consistent definitions.
- Not Quantitative: For precise risks, use fault tree analysis or quantitative methods.
- Static: Doesn't account for probability distributions; suitable for screening.
- Over-Simplification: Complex interactions may require advanced tools.
Combine with other tools like JHA forms for comprehensive assessments.
OSHA & Industry Standards
OSHA requires hazard identification and risk assessment under the General Duty Clause. The risk matrix supports compliance with 29 CFR 1910 standards and ANSI/ASSP Z690 risk management.
OSHA 1910.132
Hazard assessment for PPE selection based on workplace risks.
ISO 45001
Risk-based approach to occupational health and safety management.
Frequently Asked Questions
What is a 5x5 risk matrix?
A 5x5 risk matrix is a grid that crosses likelihood (1-5, Rare to Almost Certain) with severity (1-5, Negligible to Catastrophic). Multiplying the two ratings gives a risk score from 1 to 25, grouped into bands such as Low (1-4), Medium (5-9), High (10-16), and Critical (17-25) to prioritize controls. The 5x5 layout is a widely used industry convention rather than a single mandated table, so organizations define their own band thresholds.
What is a HIRA 5x5 matrix?
HIRA stands for Hazard Identification and Risk Assessment. A HIRA 5x5 matrix uses the same scoring as any 5x5 risk matrix: you identify a hazard, rate its likelihood and severity from 1 to 5, multiply to get a 1-25 risk score, and assign a risk band. The matrix itself is identical; HIRA simply refers to the broader workflow of identifying hazards, assessing their risk, and selecting controls.
How do you score likelihood and severity?
Score likelihood on a 1-5 scale (1 Rare, 2 Unlikely, 3 Possible, 4 Likely, 5 Almost Certain) based on how often the hazard is expected to cause harm. Score severity on a 1-5 scale (1 Negligible, 2 Minor, 3 Moderate, 4 Major, 5 Catastrophic) based on the worst credible outcome. Apply consistent, documented definitions so everyone on the team rates the same hazard the same way, then multiply likelihood by severity for the risk score.
What is an acceptable risk score?
There is no universal acceptable risk score; each organization defines its own thresholds. As a common best-practice convention on a 5x5 matrix, Low scores (1-4) are often acceptable with routine controls, Medium scores (5-9) require review and additional controls, High scores (10-16) demand prompt action, and Critical scores (17-25) usually mean work should stop until the hazard is eliminated or reduced. Always follow your own organization's risk acceptance criteria and applicable regulations.
Hazard Identification & Risk Assessment Guide
Learn the complete HIRA process with our in-depth guide covering hazard identification methods, the 5x5 risk matrix, hierarchy of controls, OSHA requirements, and best practices for continuous hazard monitoring.
Read: Hazard Identification & Risk Assessment Guide →5x5 Risk Matrix Examples for JHA
See fully worked 5x5 matrix examples for construction, warehouse, maintenance, and office tasks, with likelihood x severity scores, risk bands, and recommended controls you can apply to your next JHA or HIRA.
Read: 5x5 Risk Matrix Examples →Embed This Tool
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