Your grade journey
OCR GCSE Chemistry B (Twenty First Century Science)grade boundaries
Explore official boundaries. See where your marks take you.
J2583 official seriesMaximum mark 180
Exam series
Tier / route
Flight log / June 2026
Grade boundaries
OfficialHigher tier · 03 / 04 · Out of 180
Grade 9
138
marks / 180
Grade 7
111
marks / 180
Grade 5
75
marks / 180
Grade 4
57
marks / 180
All grade thresholds
| Grade | Minimum mark | Mark range | % of maximum |
|---|---|---|---|
| 9 | 138 | 138–180 | 77% |
| 8 | 124 | 124–137 | 69% |
| 7 | 111 | 111–123 | 62% |
| 6 | 93 | 93–110 | 52% |
| 5 | 75 | 75–92 | 42% |
| 4 | 57 | 57–74 | 32% |
| 3 | 48 | 48–56 | 27% |
| U | Below 48 | ||
These boundaries apply to this exam series and route.
How these boundaries have changed
Higher tier, every official series. Boundaries move each year with how hard the papers were.
| Series | 9 | 8 | 7 | 6 | 5 | 4 | 3 |
|---|---|---|---|---|---|---|---|
| June 2026 | 138-3 | 124-3 | 111-3 | 93-1 | 75 | 57+1 | 48+2 |
| June 2025 | 141+13 | 127+13 | 114+14 | 94+13 | 75+12 | 56+11 | 46+10 |
| June 2024 | 128 | 114 | 100 | 81 | 63 | 45 | 36 |
+ higher than the same series a year earlier (harder to reach) · − lower (easier to reach).
Grade calculator
June 2026 · Higher tier
Enter your mark for each paper to see your grade.
111 marks needed for Grade 7.
Frequently asked questions
What did you need for a grade 4 in Chemistry B (Twenty First Century Science) in June 2026?
In June 2026, grade 4 in OCR GCSE Chemistry B (Twenty First Century Science) (J258) needed 87 out of 180 on foundation tier; 57 out of 180 on higher tier.
What was the boundary for a grade 9 in June 2026?
138 out of 180 on higher tier — the top grade for GCSE Chemistry B (Twenty First Century Science) in June 2026.
How is my grade worked out?
Your marks from each paper are added up (scaled by a weighting factor where papers count differently) to give your subject mark, which is then compared with the boundaries. Your grade comes from the total — not from each paper separately.
When will the next boundaries be published?
OCR publishes grade boundaries on results day for each series. Until then, any figures shown for a future series are Starley estimates, clearly labelled, based on recent years.