IB CAS Hours Calculator
Enter the hours you have logged in creativity, activity, and service, set a target, and track the weekly pace you need before the CAS deadline. It is a planning aid, not a substitute for your coordinator’s sign-off.
IB CAS Hours Calculator
Enter the hours you have logged in each CAS strand and your target. The calculator totals the hours and shows the weekly pace you need to finish before the deadline.
Results
Total CAS hours
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Hours remaining
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hWeekly pace needed
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h/week—
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Enter your strand hours and press Calculate hours to see your total, remaining hours, and weekly pace.
Formula
total = C + A + S; remaining = max(0, target - total); pace = remaining / weeks
The total is the sum of creativity (C), activity (A), and service (S) hours. Remaining hours are the target minus that total, never negative. The weekly pace is the remaining hours divided by the weeks left. A strand is treated as covered once it reaches about half of an even third of the target, so the plan reads as balanced only when all three strands are represented. If you want the academic side of your diploma in one figure, the IB Diploma Points Calculator converts your subject grades into the 45-point total.
What the IB CAS hours calculator does
The IB CAS hours calculator helps Diploma Programme students plan and track the time they spend on Creativity, Activity, and Service. CAS is one of the three core requirements of the IB Diploma, alongside the Extended Essay and Theory of Knowledge, and students complete it across roughly 18 months of the programme. Rather than guessing whether you are on track, the tool adds your logged hours, compares them with a target, and shows the weekly pace you need to finish before your school’s deadline. The IBO sets out the CAS expectations, including the seven learning outcomes, in its official curriculum guidance.
Most IB coordinators suggest aiming for about 150 CAS hours in total, spread across the three strands, though the IBO does not publish a single mandatory minimum. That makes a personal target and a clear record more useful than chasing an exact official number. Use the tool when you start the programme, when you review progress each term, or whenever a new experience ends and you want to log it. If your subject marks are the part you are weighing up instead, the IB Predicted Grade Calculator shows how those marks may translate into university offers.
The tool is built for students, CAS coordinators, and parents who want a plain view of progress without opening a spreadsheet. It keeps the sustained CAS project visible alongside the hour count, because completing that project is a separate requirement from the hours themselves. Treat the output as a planning aid: your coordinator still reviews and signs off the portfolio, and the IB assesses CAS through reflections and learning outcomes rather than a fixed hour total.
A steady record also changes how you talk about CAS in university applications. Admissions teams look for sustained commitment and reflection, and a running total makes it easy to show that your service or activity strand did not happen in a two-week burst. If you want the academic headline of your diploma in one figure, the IB Diploma Points Calculator converts your subject grades into the 45-point total.
Key concepts behind CAS
Four ideas explain how CAS hours add up and why a balanced split matters. The three strands are the foundation, and the sustained project is the requirement that students most often forget until the final term. Getting comfortable with these before you log time makes the number the tool returns feel less arbitrary.
Creativity
Experiences involving creative thinking and problem solving, such as music, visual art, coding, or writing. Logging them separately shows whether your imaginative work is balanced against physical and service time.
Activity
Physical exertion that contributes to a healthy lifestyle, including sport, dance, or outdoor pursuits. The strand is about individual wellbeing, not competition results.
Service
Unpaid, voluntary exchange that benefits the community, such as tutoring, environmental work, or charity support. Service must be a genuine two-way exchange, not a paid job.
CAS project
At least one sustained CAS experience of at least a month that spans a longer period and engages all three strands. It is a separate requirement from the hour total and a common reason students miss full CAS completion.
It helps to separate the hours from the experience. The hours are a simple total you can track by hand; the experience is what your reflections and your coordinator judge. Because the IB expects a balance across creativity, activity, and service, a plan that hits 150 hours but loads them all into one strand is weaker than a balanced 120. The cards above keep the moving parts visible so you can see which strand is doing the work, and students moving up from earlier qualifications can use the GCSE Grade Calculator to see how school-leaving results compare with Diploma expectations.
Balance also protects you when a single activity falls through. If your only service block is a one-off event that gets cancelled, a plan with most hours already in service loses a large share of its total, while a balanced plan barely moves. Treating each strand as its own bucket, rather than one combined number, is the simplest way to keep that risk small, and it matches how coordinators read a portfolio at sign-off time. Schools differ on how strictly they enforce an even split, but none rewards a lopsided record, so the conservative move is to keep each strand visibly populated throughout the programme.
How to use this calculator
Follow six steps and the totals appear as you type. The final CAS record is still set by your own coordinator’s sign-off rather than by a single hour target, so your school’s CAS handbook remains the authority for any programme-specific rule. Once CAS and grades are tracked, the Scholarship Eligibility Calculator checks whether your profile meets award criteria. You can update the strand fields after every experience, and every change recalculates immediately, so it is easy to test what a new club or volunteering block would do to your weekly pace.
- 1 Open your CAS portfolio or journal and note the hours you have already logged in creativity, activity, and service.
- 2 Enter those three totals in the strand fields, using whole hours rounded to the nearest sensible value.
- 3 Set your target total. If your coordinator suggested 150 hours, keep that; otherwise enter your school’s guidance.
- 4 Enter the weeks remaining until your CAS deadline, counting from today to the final submission date.
- 5 Tick the CAS project box once your sustained, multi-strand project is finished and documented.
- 6 Read the total, remaining hours, and weekly pace, then add experiences to the weakest strand until the balance looks even.
A practical way to use the tool is to enter your confirmed hours first, then experiment with experiences you are planning. Entering a range for a future block shows you the weekly pace you are safely inside and the pace you would reach only with a busy term. That turns the calculator from a passive tracker into a planning aid: you can see which strand is worth the most attention because it is the one furthest behind its goal.
How the hours are worked out
The IB CAS hours calculator builds your totals from the three strand inputs and your target. To see how the academic side of your diploma maps to university entry, the IB Predicted Grade Calculator works from your subject marks while this tool handles the core requirement.
Mid-programme check
Inputs: Creativity 30h, Activity 25h, Service 20h, Target 150h, Weeks 30
Calculation: total = 30 + 25 + 20 = 75 hours logged. Remaining = 150 - 75 = 75 hours. Weekly pace = 75 / 30 = 2.5 hours per week across the three strands.
75 hours remain, so a steady 2.5 hours per week keeps the plan on track.
Notice the total is just the sum of the three strands, so 75 logged hours against a 150 target leaves 75 to find across 30 weeks, or 2.5 hours per week. That pacing is the whole point: a large target feels manageable once it is a small repeatable habit. If you instead log 140 service hours and almost nothing else, the total may pass while the plan fails the balance check, because each strand should reach about half of an even third of the target. The mapping step is deliberately simple once the totals are known, which keeps the estimate honest and stops a near-complete plan from being reported as done when one strand is missing.
The IBO describes CAS through seven learning outcomes and a completed portfolio rather than a fixed hour total, and the official curriculum page sets out the balance and project expectations in detail. This calculator uses the roughly 150-hour coordinator norm as a planning target, not as an official rule, so you can adjust it to your school’s guidance.
Why a running CAS total helps
Keeping a live total with the IB CAS hours calculator changes CAS from a vague obligation into a plan you can actually steer. The benefits show up long before the deadline, mostly as small choices that are easier to make early than to fix late.
- You get an honest view of progress instead of a vague feeling that you have “done enough”, which is the most common way students fall short of CAS completion.
- The weekly pace turns a large target into a small, repeatable habit, so a busy term does not wipe out your whole plan.
- Strand balance flags stop you from stacking hours in one area and then scrambling to invent service or activity time at the end.
- Tracking the CAS project separately keeps the sustained-experience requirement visible alongside the hour count.
- A clean running total makes termly meetings with your coordinator faster, because the numbers are already assembled.
The habit also feeds other planning tools. Once your pace is set, the Study Schedule Calculator can place those weekly hours around revision so CAS and coursework support each other.
What moves your CAS total
The IB CAS hours calculator is a planning aid, so a few inputs change how quickly your logged hours turn into a finished portfolio. The three factors below are the ones students most often overlook when they estimate CAS in their head, and CAS strengthens applications in ways a number alone does not — the College Application Cost Calculator helps you budget the admissions process those experiences support.
School policy
Some schools require evidence or reflections per hour block, which changes how quickly you can log time even when the activity is done.
Evidence quality
Hours only count once they are reflected and signed off, so a large logged total with no reflections may not survive coordinator review.
Project overlap
A single long project can feed all three strands, but only if you document creativity, activity, and service within it.
Limitation: This calculator plans and tracks hours; it does not approve CAS experiences or replace your coordinator’s sign-off.
Limitation: The IB does not mandate an exact minimum hour count, so treat the 150-hour target as a planning guide, not a rule.
A useful mental check is to sort your experiences from longest to shortest and ask where the time actually sits. If most of your hours are in activities you enjoy and can keep doing, the total is robust and the balance is easy to hold. If most of the time is in one event you cannot repeat, small gaps open up and the weekly pace rises. Treat the estimate as a range rather than a fixed point until your coordinator confirms the portfolio, and remember that CAS strengthens applications in ways a number alone does not.
Sources and further reading
The expectations used here are drawn from the following references. They describe the IB norm that most Diploma Programme schools follow, but individual schools can set their own CAS policy, so treat these links as background rather than a substitute for your coordinator’s handbook.
- IBO — Creativity, Activity, Service curriculum
The IBO describes CAS as a core DP requirement completed over about 18 months, with seven learning outcomes and at least one sustained CAS project.
- IBO — University admission
Context on how the IB Diploma, including CAS, is read by universities during admission.
Frequently asked questions
Q: How many CAS hours do I need for the IB diploma?
A: The IBO does not set one mandatory minimum. Many coordinators suggest about 150 hours across the programme, which is why this calculator uses 150 as the default target. Check your school’s CAS handbook, because some set their own expectation.
Q: Do CAS hours have to be split across creativity, activity, and service?
A: Yes, in practice. CAS expects a balanced experience across all three strands, and this calculator flags your plan as unbalanced if almost all hours sit in one area even when the total is met.
Q: Can one CAS project cover all three strands?
A: Yes. A sustained CAS project that runs over a longer period can include creativity, activity, and service, but you must document each strand within it. The project is a separate requirement from your total hours.
Q: What counts as a valid CAS hour?
A: A valid hour is genuine, supervised time on a CAS experience, such as rehearsing, training, or volunteering. Travel time and paid work do not count, and the hour should be backed by a reflection your coordinator can review.
Q: Does the IB set a minimum number of CAS hours?
A: No. The IB assesses CAS through seven learning outcomes and a completed portfolio rather than a fixed hour total. A target such as 150 hours is a coordinator planning convention, not an official threshold.
Q: How long do I have to complete my CAS requirements?
A: CAS runs across roughly 18 months of the Diploma Programme, from the start of the course to your final reflection and coordinator sign-off. Enter the weeks left until your school’s deadline to see the weekly pace you need.