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Risk Matrix Calculator (5×5)

Score any hazard by likelihood and severity to get an instant RAG rating and HSE-aligned mitigation timeline. Use this for risk assessments, audits, and safety reviews.

Hazard details

2Unlikely
RareAlmost certain
2Minor
NegligibleCatastrophic
Aligned to HSE risk management guidelines. All data stays in your browser.

Risk matrix — your position highlighted

Sev →
Like ↓
1
Negl
2
Mino
3
Mode
4
Majo
5
Cata
5 Almo
5
10
15
20
25
4 Like
4
8
12
16
20
3 Poss
3
6
9
12
15
2 Unli
2
4
6
8
10
1 Rare
1
2
3
4
5
Low risk (score 1–4)
Medium risk (score 5–12)
High risk (score 15–25)

Risk assessment

Live
Risk score
4
Low risk
Likelihood
2 — Unlikely
Severity
2 — Minor
Required action
Monitor and review annually. No immediate action required. Document in risk register.
Likelihood scale

Rating likelihood (1–5)

  • 1 — Rare
  • 2 — Unlikely
  • 3 — Possible
  • 4 — Likely
  • 5 — Almost certain
Severity scale

Rating severity (1–5)

  • 1 — Negligible
  • 2 — Minor
  • 3 — Moderate
  • 4 — Major
  • 5 — Catastrophic
RAG thresholds

Risk score thresholds

  • 1–4: Low — monitor and review
  • 5–12: Medium — action within 1 month
  • 15–25: High — immediate action

Log risk assessments against assets.

AssetOS links risk scores directly to assets, work orders, and inspection records — so nothing falls through the gap between spreadsheet tabs.

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