What is a risk matrix?

A risk matrix is a visual chart used to evaluate and prioritize potential threats by plotting the likelihood of an event against the severity of its impact.

How It Works

• Two Axes: One axis measures probability (how often the event might happen, from rare to frequent), while the other measures impact (how severe the consequences would be, from negligible to catastrophic).
• The Grid: Cells inside the grid represent specific risk scenarios based on where the two axes intersect.
• Color Coding: Scores are typically color-coded—such as green for low risk (accept or monitor), yellow/orange for moderate risk (manage and mitigate), and red for high risk (immediate action required).

Why Organizations Use It

• Easy Prioritization: Helps teams focus limited time and money on the most dangerous threats instead of minor issues.
• Clear Communication: Provides a simple, shared visual language for managers, stakeholders, and compliance teams to understand exposure.
• Systematic Planning: Turns unpredictable hazards into structured mitigation plans.

You can read more about building these tools in this Risk Assessment Matrix Guide.

Create a risk matrix by mapping the likelihood of an event against its impact on a color-coded grid.

📌 Step 1: Identify Your Risks

• Brainstorm potential threats with your team.
• Group risks into clear buckets like operational, financial, or strategic.
• List every specific scenario you face.

📊 Step 2: Define the Axes

• Choose a matrix size, such as a standard 5×5 grid.
• Set the X-axis for Likelihood (from 1 = Rare to 5 = Certain).
• Set the Y-axis for Impact (from 1 = Insignificant to 5 = Catastrophic).

📈 Step 3: Calculate the Scores

• Multiply likelihood by impact to get a score from 1 to 25.
• Assign color zones based on your scores:
  • Low Risk (Green): Scores 1 to 6
  • Medium Risk (Yellow): Scores 7 to 14
  • High Risk (Red): Scores 15 to 25

🗓 Step 4: Prioritize and Review

• Plot your identified risks onto their matching grid cells.
• Focus your mitigation resources on high-score red zones first.
• Refresh and update the matrix during regular team reviews.

A 5x5 risk matrix is a visual grid used by organizations to evaluate and prioritize potential risks by multiplying a hazard's likelihood by its severity.

How the Matrix Works

The grid features two axes, each rated on a 1-to-5 scale:

• Likelihood (X-axis): How probable it is that the event will happen, ranging from 1 (Rare) to 5 (Almost certain).
• Severity/Impact (Y-axis): How bad the consequences will be if it happens, ranging from 1 (Insignificant/Negligible) to 5 (Severe/Catastrophic).

Multiplying these two numbers gives a final risk score between 1 and 25.

Risk Score Interpretations

Scores are typically color-coded like a traffic light to determine the required action:

• 1–4 (Green - Low Risk): Acceptable; routine monitoring is enough.
• 5–9 (Yellow/Amber - Moderate Risk): Adequate or tolerable, but requires mitigation over time.
• 10–16 (Orange/High Risk): Unacceptable or high; active intervention and safety controls are needed.
• 17–25 (Red - Critical Risk): Unacceptable; urgent, immediate action is required to stop work or redesign processes.

You can read more about setting up these criteria in this 5x5 Risk Matrix Guide.

The highest risk level in a risk assessment matrix is typically labeled as High, Extreme, or Critical, usually represented by a score of 17 to 25 on a 5x5 grid.

Understanding the Peak Risk Level

• Definition: This top-tier level occurs at the intersection of maximum likelihood (almost certain to happen) and maximum severity (catastrophic impact, such as a fatality or crippling financial loss).
• Color Coding: It is universally marked in red on visual grids.
• Required Action: Activities or projects falling into this zone demand an immediate halt to the activity or an emergency action plan with a named owner until the risk is mitigated.

You can learn how to create and manage Microsoft Support Array Formulas for mathematical matrices or view community methods on StackOverflow.

Creating a Data Table / Grid Matrix

1. Choose a starting cell (like A1).
2. Type your row headers down the first column and your column headers across the first row.
3. Enter your data values into the intersecting cells to form the grid.

Performing Mathematical Matrix Operations

1. Highlight an output cell range matching your expected result size.
2. Type a built-in matrix formula like =MMULT(array1, array2) for multiplication or =MINVERSE(array) for an inverse.
3. Press Enter if you use Microsoft 365 dynamic arrays, or press Ctrl + Shift + Enter for older Excel versions.