SERNEM / CALCULATION STUDIO

Risk assessment

MODEL / BASISL × S → 1–25

5×5 HSE RISK ASSESSMENT

5×5 HSE Risk Matrix Calculator

Start by defining the activity and hazard being assessed, then evaluate likelihood, severity, control measures and the residual risk level together.

5×5: likelihood × severity; low 1–4, medium 5–9, high 10–16, extreme 17–25. HIRARC uses the same 1–25 range, labelling 17–25 critical. Records are not automatically merged.

Unsaved draft in this tab only. KPI records and trends stay unchanged.

INTERACTIVE CALCULATOR

Risk Matrix Calculator

Select likelihood and severity to calculate the risk score and risk level instantly.

1

DEFINE INITIAL RISK

Select likelihood and severity for the current situation.

Risk Score
9
Medium Risk
Recommended Actions
  • ✓Review existing control measures.
  • ✓Inform the site supervisor.
  • ✓Monitor the risk during the work.
2

DEFINE CONTROL MEASURES

Describe existing or planned control measures.

0 / 1000
3

CALCULATE RESIDUAL RISK

Evaluate likelihood and severity after controls.

Residual Risk Score
4
Low Risk
✓ RISK INTERPRETATION

Residual risk is at an acceptable level after controls.

Generate and download the detailed risk report.
◈
INITIAL RISK
9Medium Risk
Likelihood: 3×Severity: 3
◇
RESIDUAL RISK
4Low Risk
Likelihood: 2×Severity: 2
56%
RISK REDUCTION

Risk reduced by 56%.

5 × 5 RISK MATRIX

Risk Level Overview

View the selected likelihood and severity position on the matrix.

Risk Score
9Medium Risk
S × L
L1
L2
L3
L4
L5
S5
5
10
15
20
25
S4
4
8
12
16
20
S3
3
6
9Initial Risk
12
15
S2
2
4Residual Risk
6
8
10
S1
1
2
3
4
5
LOW
1 – 4
MEDIUM
5 – 9
HIGH
10 – 16
EXTREME
17 – 25
SELECTED VALUES
Likelihood: 3•Severity: 3
Calculation
3 × 3 = 9