What percentage is each grade in IGCSE Biology?
Grade boundaries change every session, so percentages aren't fixed. Based on the Edexcel June 2025 boundaries for overall (9–1), here's the percentage needed for each grade in Biology (4BI1).
| Grade | Min mark | Min percentage |
|---|---|---|
| 9 | 140/180 | 78% |
| 8 | 124/180 | 69% |
| 7 | 109/180 | 61% |
| 6 | 94/180 | 53% |
| 5 | 79/180 | 44% |
| 4 | 65/180 | 37% |
| 3 | 54/180 | 30% |
| 2 | 43/180 | 24% |
| 1 | 32/180 | 18% |
Overall (9–1) · maximum mark 180 · June 2025.
FAQ
What percentage is a 9 in IGCSE Biology?
In June 2025 (Overall (9–1)), a 9 needed about 78% (140/180). Boundaries shift slightly each session.
What percentage is a pass (4) in IGCSE Biology?
A grade 4 needed roughly 37% in June 2025. Grade 4 / C is generally treated as a standard pass.
Are these IGCSE Biology percentages official?
They are derived from the official Edexcel grade threshold tables. Boundaries are set per session, so use these as a guide and confirm with your exam board.