Study Time Planner
Divide your available study hours across subjects using relative weights such as exam marks or difficulty. Includes a worked example and planning tips.
Results
Subject 1
- Subject 2
- 7 hours
- Subject 3
- 5 hours
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Educational estimates · not financial advice · free, no signup
Formula / how it works
Hours for subject i = total hours × weight i ÷ sum of all weights. Weights are normalised, so any positive numbers work.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
When exams are close and time is limited, the question is how to divide hours among subjects. A common approach is to weight them by exam marks, difficulty or how far you are from your target. This planner takes the total hours you have and a list of relative weights, normalises them, and tells you how many hours each subject gets. Students use it to build revision timetables, tutors to suggest balanced plans, and anyone studying for several certifications to set priorities. It handles the arithmetic only; the weights are your judgement, so choose them honestly.
When to use / who it helps
- You have a fixed number of hours before exams and several subjects.
- Subjects have different exam weights or difficulty.
- You want a quick baseline plan to refine.
- You are comparing two ways of weighting the same subjects.
- You need to explain a plan to a teacher or parent.
How to use
Steps
- Enter the total hours available for study.
- Enter weights separated by commas, one per subject, in the order you will remember.
- Use numbers that reflect priority, such as marks or a 1–5 difficulty score.
- Read the hours for each subject.
- Adjust weights and re-run if the plan feels unbalanced.
- Convert hours into sessions of 45–90 minutes.
How to interpret results
- The weights are relative; 40,35,25 gives the same split as 8,7,5.
- A weak subject can receive a higher weight even if its exam mark is smaller.
- Subject 1 corresponds to the first weight, and so on.
- The plan assumes equal efficiency per hour; practice testing and spacing improve results.
- Leave a buffer for review and rest.
Common mistakes & gotchas
- Entering percentages that do not reflect your real priorities.
- Forgetting that the order of weights matches the subject order.
- Using all your hours without any buffer.
- Treating the plan as fixed instead of adjusting after mock tests.
- Using negative or zero weights.
Worked example
Worked example — 20 hours across weights 40, 35, 25
- Sum of weights: 40 + 35 + 25 = 100.
- Subject 1: 20 × 40 ÷ 100 = 8 hours.
- Subject 2: 20 × 35 ÷ 100 = 7 hours.
- Subject 3: 20 × 25 ÷ 100 = 5 hours; total is 20 hours.
Result: 8, 7 and 5 hours for the three subjects.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Hours for subject i = total hours × weight i ÷ sum of all weights. Weights are normalised, so any positive numbers work.
Frequently asked questions
How should I choose weights?
Use exam marks, topic difficulty or your confidence level, or a mix of them.
Do weights have to add to 100?
No. They are normalised automatically.
How many subjects can I include?
Add as many weights as you need, separated by commas.
Is equal time per subject best?
Not necessarily. Spending more time on high-weight or weak subjects usually pays off.
How do I use the hours?
Break them into focused sessions with breaks, and schedule them across days.
Does this replace a timetable?
No. It gives a split; you still decide when to study.