Biology
IB Biology is a Group 4 experimental science course covering the vast diversity of life from the molecular to the macro level. The IB Biology course emphasizes practical investigation, data analysis, and scientific communication across both SL and HL. This IB Biology grade calculator helps students predict their final exam score.
Subject
Grade boundaries
Assessment inputs
Enter raw marks below — grades calculate live.
Paper 1
Max 55 marks
Paper 2
Max 50 marks
Individual Investigation
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.
Astronomy
Astronomy is the study of the universe and its contents outside of Earth's atmosphere, including the positions, motions, and properties of celestial objects.
Chemistry
IB Chemistry is a Group 4 experimental science combining academic study with practical and investigational skills.
Computer Science
IB Computer Science is a Group 4 course requiring an understanding of computational thinking, programming, and how computers and digital devices operate.
Design Technology
IB Design Technology is a Group 4 course placing inquiry and problem-solving at its heart, using the design cycle to analyse problems, develop solutions, and evaluate prototypes and products.
Historical grade boundaries
Every published boundary across 11 sessions. Multiple dots per session are timezone variants.
Global grade distribution for SL Biology
Based on May 2024 results for SL Biology (21,564 candidates).
Common questions about Biology
What levels are available for IB Biology?
Biology is currently mapped with SL and HL calculator inputs on calculateIB.
Which syllabus versions are included for IB Biology?
This page tracks 2 syllabus versions: 2025 to Present, 2016 to 2024.
How are IB Biology 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.