Add your hazards, score likelihood and severity from 1–5, and see each one plotted on the matrix — the same scoring UK principal contractors and SSIP schemes expect in a risk assessment.
| Likelihood ↓ / Severity → | 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 |
Score = likelihood × severity. 1–4 low (green), 5–9 medium (yellow), 10–15 high (orange), 16–25 very high (red). High and very-high risks need further control measures before work starts.
Our risk assessment builder adds control measures, residual scoring, who-might-be-harmed and a branded PDF — everything this free tool can't do.