IGCSE Biology (4BI1) grade boundaries — June 2026
Edexcel International GCSE (Pearson) (4BI1). The official grade thresholds for the June 2026 series — the minimum raw mark needed for each grade, by tier and paper combination. Pick the option matching the papers you sat.
Edexcel publishes these as grade threshold tables: "grade thresholds" and "grade boundaries" are two names for the same numbers.
June 2026 at a glance
- A 9 in Biology required 142/180 (79%) on overall (9–1).
- That 9 threshold is 2 marks higher than June 2025 — slightly harder to achieve.
- Across paper variants, the 9 boundary ranged from 142 to 146 marks — variant choice mattered this session.
- A grade 4 needed roughly 38% on overall (9–1).
Overall (9–1)
| Grade | Min mark | Min % |
|---|---|---|
| 9 | 142 | 79% |
| 8 | 127 | 71% |
| 7 | 112 | 63% |
| 6 | 97 | 54% |
| 5 | 82 | 46% |
| 4 | 67 | 38% |
| 3 | 55 | 31% |
| 2 | 43 | 24% |
| 1 | 32 | 18% |
Maximum mark: 180.
Overall · variant 2 (9–1)
| Grade | Min mark | Min % |
|---|---|---|
| 9 | 146 | 82% |
| 8 | 131 | 73% |
| 7 | 117 | 65% |
| 6 | 104 | 58% |
| 5 | 92 | 52% |
| 4 | 80 | 45% |
| 3 | 64 | 36% |
| 2 | 49 | 28% |
| 1 | 34 | 19% |
Maximum mark: 180.
Calculate your Biology grade →
Figures sourced from the official Edexcel grade threshold tables. Always confirm with your exam board.