If you’re searching for how many CAS hours you need, here’s the answer that surprises a lot of students and even some parents: the IB removed its fixed hour requirement starting with the 2017 exam session, and there has been no official minimum hour count since. If you’ve read “150 hours” somewhere recently, that information is outdated.
The Myth: The 150-Hour Rule
For years, IB students needed to log a minimum of 150 hours across CAS, roughly split across the three strands. This created a widely known, easy-to-understand benchmark — but it also created real problems the IB specifically wanted to address.
Why the IB Removed the Fixed Hour Requirement
Two main reasons drove this change: first, a rigid hour count encouraged students to treat CAS as a box-ticking exercise focused on logging time rather than genuine engagement; second, it created a real incentive for students to inflate or fabricate hours they hadn’t actually completed, undermining the integrity of the entire component. Removing the fixed number shifted the focus toward genuine, evidenced engagement instead.
The Reality: What the IB Actually Requires Now
Instead of a fixed hour count, current CAS requirements center on:
- Demonstrating all seven learning outcomes at least once across your CAS experiences, evidenced through your reflections
- Completing at least one CAS Project — a sustained, collaborative initiative lasting a minimum of one month and drawing on at least two of the three strands (see our guide on planning a long-term CAS group initiative)
- Sustained engagement across roughly 18 months, showing regular, ongoing commitment rather than concentrated activity squeezed into a short period near your deadline
- Balance across all three strands — Creativity, Activity, and Service — over the full period
Why Some Schools Still Mention a Number of Hours
Even though the IB itself no longer sets a fixed requirement, many individual schools maintain their own internal guidance — sometimes still referencing hours as a practical way to help students gauge whether their engagement feels sufficiently sustained, even though hours themselves aren’t what’s formally assessed. Always check your specific school’s CAS handbook and talk to your coordinator, since internal school expectations can still meaningfully shape what you’re expected to do, even without an official IB hour count behind it.
Why “No Fixed Hours” Doesn’t Mean “Less Work”
Some students misread this change as meaning CAS requires less overall commitment — in practice, the shift to outcome-based, reflection-driven assessment often demands more thoughtful engagement than simply logging hours did, since you now need to genuinely demonstrate growth and specific learning outcomes through quality reflection, not just accumulate time.
How to Know If You’re Doing “Enough” Without a Number to Aim For
Rather than asking “have I done enough hours,” ask: have I genuinely evidenced all seven learning outcomes? Have I completed a real CAS Project? Has my engagement been reasonably consistent across the full CAS period, rather than concentrated in a rushed final term? These questions are what your coordinator will actually be checking during periodic reviews (see our guide on organizing your CAS portfolio on Managebac).
Final Tip
If you’re ever unsure whether your CAS engagement is sufficient, don’t try to estimate based on an outdated hours benchmark — ask your coordinator directly for a review against the seven learning outcomes and CAS Project requirement, which is what’s actually being assessed under the current framework.