IB Science Practical Requirements Explained: What You Actually Need to Complete
Practical work is a core expectation in all IB Group 4 sciences, not an optional extra. Whether you are studying Biology, Chemistry, Physics, Environmental Systems and Societies (ESS), or Sports, Exercise and Health Science (SEHS), the IB requires sustained hands-on scientific engagement throughout the course.
Understanding how many practical hours are required—and how they are meant to be used—helps students plan their workload realistically and avoid last-minute issues with internal assessments.
Required Practical Hours in IB Group 4 Sciences
The IB sets clear expectations for practical work across Standard Level (SL) and Higher Level (HL):
- Standard Level (SL): approximately 40 hours of practical work
- Higher Level (HL): approximately 60 hours of practical work
- ESS (SL and HL): approximately 30 hours of practical work
These hours are spread across the two-year course and are designed to develop experimental skills, data analysis, and scientific reasoning rather than simply “ticking boxes.”
Internal Assessment vs General Practical Work
Not all practical hours are devoted to the Internal Assessment (IA).
Typically:
- Around 10 hours are allocated specifically to IA planning, data collection, and analysis
- The remaining hours come from regular class experiments, investigations, simulations, and fieldwork
This means the majority of your practical time is meant to build skills gradually, so that the IA does not feel unfamiliar or overwhelming when it begins.
How Practical Time Is Usually Distributed
Although schools vary slightly in how they organize lessons, the general structure looks like this:
- Routine laboratory experiments tied to syllabus topics
