Use this free online study time calculator to plan your exam preparation — see your total available study hours and how to split them evenly across all your subjects.
How to Use the Study Time Calculator
Enter the "Days Until Exam".
Enter the "Number of Subjects" you need to prepare.
Enter the "Hours Available Per Day" you can realistically study.
Click "Calculate Study Time" to see your total available hours and how to split them across subjects.
How the Numbers Are Worked Out
The calculator multiplies days by daily hours to get your total study time, then shares it equally among your subjects. With 45 days left, 5 subjects and 6 hours a day: total = 45 × 6 = 270 hours, per subject = 270 ÷ 5 = 54 hours, and per subject per day = 6 ÷ 5 = 1.2 hours.
Results are shown in decimal hours to one place. To convert the decimal part to minutes, multiply it by 60: 1.2 hours is 1 hour 12 minutes, and 0.75 hours is 45 minutes.
Total Hours at a Glance
Days left
3 h/day
5 h/day
8 h/day
15
45
75
120
30
90
150
240
60
180
300
480
90
270
450
720
Seeing the total helps you check whether a plan is realistic. If your syllabus has 120 chapters and you have 150 hours, you have roughly 1 hour 15 minutes per chapter, including revision.
Adjusting the Equal Split
An equal split is a starting point. Subjects differ in length and in how well you already know them, so it often makes sense to shift time towards weak or heavy subjects. One simple method is to give each subject a weight from 1 to 3 and share the total in proportion.
For the 270-hour example, weights of 3 for Maths, 2 each for Physics and Chemistry, and 1 each for English and Computer Science add up to 9. Each weight point is then worth 270 ÷ 9 = 30 hours, giving Maths 90 hours, Physics and Chemistry 60 each, and English and Computer Science 30 each.
Making the Plan Work
Enter hours you can actually sustain, not your best day. School or college, travel, meals and sleep all come first; a plan built on 10 hours a day usually collapses within a week.
Keep the final stretch for revision and practice papers. One approach is to run the calculator with fewer days than you really have, for example 38 instead of 45, and keep the last week free for full syllabus revision.
Splitting a day into several subjects, rather than studying one subject all day, keeps earlier topics fresh. Short breaks between sessions also help you concentrate for longer.
Recalculate every week or two. If you fall behind, the new per-subject figure shows exactly how much extra time each subject now needs.
Frequently Asked Questions
Total Study Hours = Days Until Exam × Hours Available Per Day. This total is then divided evenly by the Number of Subjects to give hours per subject.
No, this calculator splits your available time equally across all subjects. If some subjects need more attention, adjust the recommended hours manually to suit your own priorities.
Multiply the decimal part by 60. 0.2 hours is 12 minutes, so 1.2 hours is 1 hour 12 minutes. Likewise 2.5 hours is 2 hours 30 minutes.
Count them only if you will still study on those days. A simple way is to use your average hours across the whole period, for example 3 hours on college days and 7 on weekends averages to about 4.1 hours a day over a week.
Reserve it before you split the rest. Enter fewer days than you really have so the calculator only plans first-time study, and keep the remaining days for revision and timed practice papers.