Boundary unavailable for May 2025 (m25)
Reverted to May 2024 (m24) for this subject.
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. As one of the oldest sciences, the IB Astronomy SL course covers the solar system, stars, galaxies, cosmology, and the tools and techniques astronomers use to observe and interpret the universe. This school-based syllabus (SBS) grade calculator helps IB Astronomy students predict their final score.
Subject
Grade boundaries
Assessment inputs
Enter raw marks below — grades calculate live.
Paper 1
Max 30 marks
Paper 2
Max 40 marks
IA: Indvidiual Investigation
Max 30 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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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 1 sessions. Multiple dots per session are timezone variants.
Global grade distribution for SL Astronomy
Based on May 2024 results for SL Astronomy (104 candidates).
Common questions about Astronomy
What levels are available for IB Astronomy?
Astronomy is currently mapped with SL calculator input on calculateIB.
Which syllabus versions are included for IB Astronomy?
This page tracks 1 syllabus version: 2017 to Present.
How are IB Astronomy 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.