There is a specific kind of 3 a.m. that belongs only to exam season. You have four exams in nine days, a revision plan on a piece of paper you have not looked at since Sunday, and a strong feeling that you should probably start now. The problem is not effort. The problem is that “start now” is not a plan, and a countdown on a phone is not one either unless you point it at something.
I built this one to do a small, specific job: take the date and time of an exam and work out how the time you have left should be spent. It gives you a live countdown, then it works backwards. If you want 12 hours of revision and you have four weeks, that is 2.8 hours a week, and 2.8 is a number you can put in your calendar. Four weeks is not. Four weeks is how you end up doing everything the night before.
Everything runs in your browser. No account, and nothing is sent anywhere.
Put in the exam date and time and get a live countdown plus a revision plan built backwards from it — hours per week, sessions per week, and what to do if the exam is tomorrow. Exams are saved on your own device so you can watch several at once.
The timer runs on your device clock, so it is as accurate as your computer. Nothing is sent anywhere, and the exams you save stay in your own browser storage until you clear them.
Saved exams
What it actually calculates
A live countdown to the exam, in days, hours, minutes, and seconds. It ticks on your own device clock, so it is exactly as accurate as your computer, and it keeps running while the page is open.
Weeks remaining, which is the number that should drive the plan. Anything under about two weeks gets its own warning, because spaced revision stops paying off at that point and past papers take over.
Hours per week. Enter the total hours you want to study and it divides by the weeks left. It also tells you when that number is a lie: above about 12 hours a week is more than most people sustain, and the tool says so instead of letting you plan a fortnight of 14-hour days that ends on day three.
Sessions per week. Enter how many sessions you can realistically fit in — six over four weeks is a different commitment from twelve — and it gives you the per-week figure with a note on how to space it. Under three a week, past papers beat re-reading.
What the weight costs you. If the exam is 30% of the course grade and your plan is 2.8 hours a week, then 0.8 of those hours belong to this exam. It is a rough split, but it is the number that stops you protecting a 5% quiz on the same week as a 40% final.
Worked example
Say Organic Chemistry is on a Tuesday in four weeks, at 09:00, worth 30% of the course, and you have decided you will study 12 hours for it with 12 sessions.
- Time left: 29 days, 20 hours, some minutes.
- Weeks: 716 hours ÷ 168 hours = 4.3 weeks
- Hours per week: 12 ÷ 4.3 = 2.8 hours
- Sessions per week: 12 ÷ 4.3 = 2.8 sessions
- Belonging to this exam: 2.8 × 30% = 0.8 hours a week
Two and a half sessions a week for four weeks is a schedule you can keep: Tuesday evening, Thursday evening, Saturday morning, then repeat. The 0.8 hours is the part I would act on, because the remaining 2 hours a week on this exam is the difference between revising a course and believing you are revising it.
Now the same exam moved to next week. Seven days is 1 week, so 12 hours over 1 week is 12 hours in seven days, and the tool flags that as more than most people sustain. That is the correct answer. Either the plan was too ambitious, or the exam date was wrong.
Why the under-48-hours warning exists
Because the research on spacing is not subtle. Distributed practice beats massed practice by a wide margin, right up until the point where there is no time left to distribute. Inside two days, the highest-return activity is a past paper under timed conditions, then marking it honestly, then a formula sheet, then sleep.
I have been the person doing an all-nighter the night before an 8 a.m. exam. I remember feeling like I had done something. What actually happened was that I read the same material four times with no recall attempt, arrived tired, and did worse on the easy questions than I would have done with a normal night’s sleep and a short review the morning after.
The tool says this in those words because the countdown is exactly when people start making bad decisions.
How to use the hours it gives you
Put the per-week number in your calendar as an appointment, not as a goal. Half past four to five and a half, Tuesday, repeated. A goal is something you feel bad about not doing; an appointment is something you either do or move.
Then check the weight line. If the exam is more than 30% of the course, its share of your weekly hours should be the largest line in your plan. If it is not, you are spending your revision time on the things that are easiest to study rather than the things that are worth the most.
Save the exam, and save the others too. The saved table sorts by date and marks the next one, which sounds trivial and stops the specific Sunday-night panic of trying to remember which of four exams is closest.
And re-run it after every piece of coursework. The numbers move as the date gets closer, and the number that changes is the one you most need to see: the per-week hours quietly tripling in the last fortnight.
What it does not do
It does not schedule the hours. The time blocking planner takes the number this one produces and turns it into a week with real start and end times, which is the missing half of the process.
It does not know your syllabus, so it cannot tell you which chapters matter, or that the midterm only covers units one to six. A countdown knows the date. It does not know the course.
It does not track how much you actually studied. It tracks what was left and what you planned, which is a proxy, not a report.
Frequently Asked Questions
How many hours a week should I study for an exam?
Enough that you will still be doing it the week before. If the per-week figure the tool gives you is above 12, cut the planned hours rather than pretending, because a plan you abandon teaches you nothing. If it is under 3 and there is time left, you can afford to raise the target score you are aiming for instead. The number that matters is the one you could sustain on your worst week, not your best.
Is cramming better than studying little and often?
No, and the gap is not small. Spacing your sessions out over days and weeks reliably beats one long session, mostly because retrieval practice spaced in time is what sticks. The exception is the last 48 hours, where there is no time left to space anything, so a past paper and a sleep beat a third re-read. That is the only window where cramming is the better of two bad options.
Should I study in the same time slot every day?
It helps more than students expect. Attaching revision to something you already do at a fixed time — after your first coffee, before dinner — removes the daily decision of whether to start, and that decision is where most plans quietly die. The tool gives you a per-week number, so pick a slot that fits that many times and keep it. If you can, keep the slot the same across subjects too.
What if my exam is online or has a time limit?
Set the countdown to the moment your exam actually opens or begins, and put the time limit in your head as a separate constraint. If it is a 90-minute online exam, 2.8 hours of revision is roughly two full timed practice runs, which is the right shape for that format. Do not plan four hours of notes for a test that rewards speed as much as knowledge.
Does the countdown send my exam details anywhere?
No. There is no account, no server, and no analytics on any tool on this site. The countdown runs on your own device clock, and the exams you save sit in your own browser storage until you press Clear Saved Exams or clear your site data. That also means the saved list does not follow you to your phone, so if you want the countdown on both, set the date in both places rather than assuming it synced.
Other tools
- Time Blocking Planner — turn the hours per week into a real schedule
- Exam Average Calculator — pool your midterms and finals into one average
- Final Grade Calculator — what you need on the final to hit your course target
- Weighted Grade Calculator — see what each exam is worth in the course grade
- GPA Calculator — where the exam grade ends up in your term GPA
- GPA Needed Calculator — the average your remaining courses have to hit
- GPA Improvement Calculator — project your cumulative across the term
- Student GPA Tools — browse the full calculator suite
Put the per-week number in your calendar before you close this page. The countdown is the easy part; the appointment is what does the work.
Related GPA tools
- GPA Calculator — course grades and credits into a term GPA
- Cumulative GPA Calculator — combine this term with your full record
- Final Grade Calculator — the final score you need to hit your target
- Percentage to GPA Converter — that percentage into GPA points
- GPA Needed Calculator — find the GPA you need to reach a goal