Boundary unavailable for May 2025 (m25)
Reverted to May 2024 (m24) for this subject.
Marine Science
IB Marine Science is a Group 4 school-based syllabus (SBS) course exploring the science of ocean systems, marine ecosystems, and the impact of human activity on the marine environment. This IB Marine Science grade calculator helps students predict their final exam score.
Grade boundaries
Assessment inputs
Enter raw marks below — grades calculate live.
Paper 1
Max 65 marks
Paper 2
Max 35 marks
Internal Assessment
Max 24 marks
More Group 4: Sciences
These related subject routes strengthen the crawl path around this IB group and give students a faster way to compare adjacent subjects.
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Historical grade boundaries
Every published boundary across 5 sessions. Multiple dots per session are timezone variants.
Global grade distribution for SL Marine Science
Based on May 2024 results for SL Marine Science (407 candidates).
Best place to gain marks
One mark is worth more in some parts than others. The top items give you the biggest boost to your final score.
1. Paper 2
+0.86%final score for 1 mark
30% weight · max 35 marks
2. Internal Assessment
+0.83%final score for 1 mark
20% weight · max 24 marks
3. Paper 1
+0.77%final score for 1 mark
50% weight · max 65 marks
Common questions about Marine Science
What levels are available for IB Marine Science SL?
Marine Science SL is currently mapped with SL calculator input on calculateIB.
Which syllabus versions are included for IB Marine Science SL?
This page tracks 1 syllabus version: Unknown to Present.
How are IB Marine Science SL boundaries handled on this page?
The page checks the selected exam session first. If that boundary is unavailable, it falls back to May 2024 and then to the nearest available session, while keeping the fallback local to this subject route.