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Pomodoro Timer

You know the scene. You open the textbook at 9pm, read the same paragraph four times, and two hours later you have nothing to show for it. That is not a discipline problem. That is what happens when you ask your brain to hold focus for an unbounded amount of time. Almost nobody can. The trick is to give the work a container and then take the container away when it is full.

The pomodoro technique is that container, and it is named after the tomato kitchen timer Francesco Cirillo used as a student in the late 1980s. He would set the timer for 25 minutes, work, take 5 minutes off, and after every fourth block take 15 to 30 minutes. That is the whole method. I use it because it removes the two decisions that normally kill a study session: how long should this go, and am I allowed to stop yet. The timer answers both.

This is a plain pomodoro timer that runs in your browser. Set your focus length, set your breaks, press start. It counts down, it tells you when a block is done, it starts the break for you, and it will not start a new focus block without you. It also keeps a tally of how many blocks you actually finished, because I think the count is the part that changes behaviour more than the timer is.

A 25-minute focus block, a 5-minute break, and a longer break after every fourth one. Set the lengths you want, press start, and the clock runs in the box below. Nothing is saved and nothing leaves this tab.

25:00

Focus block 1 of 4. Press start when you are ready.

0 focus blocks finished, 0 minutes focused.

Off by default — a spoken announcement in a library is a nuisance, so switch it on when you want it. It uses your device’s own voice through the speaker.

The clock is built on wall-clock time, so a background tab or a sleeping laptop will not make it run slow — but a closed tab stops it completely. Breaks start themselves when a focus block ends. A new focus block never starts on its own, so it cannot creep up on you while you are away.

What the sound can and cannot do. The chime plays through your speaker, but browsers cannot force sound when a phone is on silent, and iPhones have no vibration support in web pages at all — that is an operating system limit, not something the page can work around. If a block ends and you heard nothing, check the silent switch first.

How this timer works

Four settings, then you press start and walk away from the keyboard.

  • Focus block — how long you work. The classic length is 25 minutes. It defaults to that.
  • Short break — the gap between blocks. Five minutes is the classic default and it is long enough to actually stand up.
  • Long break — the bigger gap after a full round. Fifteen minutes is a reasonable start; 30 if you have the afternoon free.
  • Blocks before a long break — four is the standard round. Two is honest on a bad day, which is better than pretending.

When a focus block ends, the timer beeps and starts the break on its own. That part is deliberate. A break you have to start is a break you skip. When a break ends, the timer shows the next focus block and waits. It will not start studying for you, because a focus block that starts on its own at 11:40pm while you are asleep is not a focus block, it is a lie you tell yourself on Monday.

The clock is built on wall-clock time rather than counting ticks. If your laptop sleeps or the tab sits in the background for a while, the countdown still reflects real elapsed time, so a 25-minute block is 25 minutes of your life and not 25 minutes of the browser being awake. Closing the tab stops everything, and the tally resets with it. Nothing is saved to your device and nothing is sent anywhere.

Why 25 minutes, and when to change it

The honest answer is that 25 is a default, not a law. It comes from Cirillo’s own routine and it survived because it is short enough that a tired person will agree to start it. A 90-minute block sounds more impressive and fails more often, because you know deep down you will not finish 90 minutes of real work.

What actually matters is finishing the block. If you stop at minute 8 because you got distracted, the block did not count, and you have trained yourself to abandon blocks. If you ride the bell at minute 25 and want to keep going, you have a real choice to make, and it is an active one. That is the entire psychological mechanism, and it works at 15 minutes just as well as at 25.

So adjust honestly. Some adjustments that tend to work:

  • 50 minutes if you are reading dense material like a textbook chapter or working through algebra problems, where your eyes and hands are busy anyway.
  • 15 minutes if you are reviewing flash cards, clearing a small reading pile, or doing admin. Shallow work does not need a deep block.
  • 90 minutes only for a single task with no natural stopping point, like writing an essay section or a lab report, and only when you have already proven you can stick with it.

One more thing that matters more than the number: the break is part of the block, not a reward after it. Stand up. Get water. Look out a window at something more than six metres away. I know that last one sounds fussy, and it is not. Looking at a phone during a 5-minute break is not a break, it is a 5-minute slot where you read other people’s opinions and then have to fight your way back into the text.

Worked example

Say it is Monday and you have a 2-hour biochem block, a stats problem set, and a reading due Thursday. The defaults are already set: 25 focus, 5 short break, 15 long break, 4 blocks per round. You press start.

  • Block 1 — biochem, 25 minutes. The timer ends, the 5-minute break starts itself.
  • Block 2 — stats, 25 minutes. Then another 5-minute break.
  • Block 3 — reading, 25 minutes. Then another 5-minute break.
  • Block 4 — whatever is left, 25 minutes. Then the 15-minute long break starts itself.

Wall-clock total: 4 × 25 = 100 minutes of focus, plus 3 × 5 = 15 minutes of short break, plus 15 minutes long = 130 minutes from first press to last break.

That last number is the useful one, because it is the number you have to actually give yourself. If you block out two hours for studying, four blocks with the standard breaks fits inside it with 10 minutes to spare, and you finish with a clean tally of 4 instead of the usual guilty “I sat there for two hours”. If you only have 90 minutes, do two blocks and stop. The tally at the bottom of the timer counts the blocks you finished and the minutes you actually focused, and it resets when you press reset.

Where this fits with the rest of the site

A timer is not a grade tool, so it is worth saying plainly what it is for. It protects the hours that produce the numbers the other calculators here read. If you want to know whether a focus block was actually worth something, run the block, then feed the result into the assignment grade calculator to see what it added to your course grade, or into the weighted grade calculator once you have several marks in. If you are mid-term and panicking, the final grade calculator tells you what the remaining pieces have to be worth, which usually tells you that the sitting in front of you is not the emergency you think it is.

For the honest part of the equation — how much study time your course load is actually asking of you — the study hours calculator turns a list of subjects and credits into hours per week and hours per day. The reading time calculator answers the other question, which is how long that assigned chapter will take before you start. Both of those feed straight into this timer.

Frequently asked questions

Does the pomodoro technique work for hard subjects like calculus or organic chemistry?

It is at its best on exactly those subjects, because the problem is not difficulty, it is the moment your attention gives out. A 25-minute block on an acid-base equilibrium problem is hard. Twenty-five unbroken minutes of a chapter you do not understand is impossible, and quitting halfway through the second one teaches you that the subject is intolerable. Blocks also give you a natural place to take the break exactly when the problem deserves it, which is the part most people skip and then blame their own motivation.

What if I miss a block or get interrupted?

Press skip and keep the tally honest. The counter exists to show you the truth, and a counter you inflate is worse than no counter at all. If an interruption is unavoidable — a roommate, a phone call, a lecture — the timer is still useful. Pause, deal with it, resume. What kills a session is not the interruption, it is the ten-minute guilt spiral afterward where you decide the session is ruined and open a video.

Should I study for four hours straight with this?

Not in one sitting. Four blocks with real breaks is roughly two hours of clock time, and that is genuinely deep work by any honest measure. If you want more, do another round after the long break, and take a proper meal break between rounds. Long single sittings produce the feeling of having studied rather than the notes to prove it. If you want a second opinion on the time side, the credit hour calculator will tell you how many credits you are carrying, and credits are the most reliable predictor of how many hours a term genuinely asks of you.

Can I change the 25 minutes and the breaks?

Yes, and you should, once you know your own pattern. The boxes are all editable. Changes apply to the next block you start, so you can lengthen a break mid-round without losing the block you are in. If you find yourself consistently finishing 20 of 25 minutes, try 45 and see whether the quality of the last five minutes was worth having. If you consistently stop at 12, drop to 15 rather than deciding you have no discipline.

Will the timer keep running if I switch tabs or close the page?

Time still counts correctly while the tab is in the background, because the clock is calculated from actual elapsed time. Closing the tab or refreshing the page stops the timer and clears the tally, and the settings go back to their defaults. Nothing is stored in your browser, so there is no history and no account. If you need a timer that survives a closed tab, use a native phone timer instead — honestly a better tool, because the friction of opening it is the friction that gets you off the couch.

Other tools

One last thing. A timer is a tool for starting, not for judging. Two blocks that you actually sat through beats six you half-remember skipping, and the grade at the end of the term is the only scoreboard that matters. If you want to know where that grade is heading, the target GPA calculator is the honest place to look.

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