45 Minute Timer

The page opens with 45 in the Minutes box, which equals 2,700 seconds or three quarters of an hour.

1. Confirm the numbers in Hours (0), Minutes (45) and Seconds (0). A lesson with a five minute registration might need 40 instead, so change the Minutes box before you start.
2. Enter a Label (optional) such as Maths exam or Period 3. It sits above the digits, so everyone knows what the clock is counting.
3. Choose whether Play a sound when time is up should be on. A tone at the end is useful for a class, and many exams use a quiet signal instead.
4. Press Start. Use Full screen to put the clock on a projector or a classroom screen.
5. If the class is interrupted, Pause holds the time and Resume continues. Reset brings the clock back to the length in the fields.

Space starts and pauses it, and R resets it while it is stopped, as long as the cursor is not in a text box.

A single clock is easier to use when the period is cut into parts. A teacher might divide a lesson like this, with the time the clock shows at the start of each part:

Exams reward pacing. Imagine a 45 minute paper with 40 questions and no other information. Reserve 5 minutes at the end to check answers, which leaves 40 minutes, or 60 seconds per question. If instead the paper says one section carries 30 percent of the marks, give it about 30 percent of the time: 0.30 x 45 = 13.5 minutes. The percentage calculator handles that sort of share quickly.

Look at the progress bar to judge pace. At the halfway mark of 22:30 remaining, you should have finished about half the questions. A full-screen clock is a cleaner reference than glancing at a wristwatch, though it should not replace a timer that your exam board or teacher provides.

The same method suits a talk. A 45 minute slot usually keeps the last 10 minutes for questions, which leaves 35 minutes of speaking. At about two minutes per slide that is roughly 17 slides. Label the timer Talk and rehearse with the clock in Full screen.

For private study, 45 minutes is a long block, and many people add a break afterward instead of continuing without a pause. A sensible pattern is 45 minutes of work followed by a rest of 10 or 15 minutes, which makes a cycle of 55 or 60 minutes. Whatever you try, notice how your attention holds up and adjust the length. If you start losing focus before 45 minutes, a 30 minute timer may fit better, and if you tend to be in the middle of a task when the time ends, the 60 minute timer gives more room.

The same length also suits a long episode of a drama or a break before a film: set it as a reminder of when to move on to something else. To see how a series of study blocks adds up over a day, the time calculator totals durations.

• It rings once. There is no repeat, no second timer and no notification when the tab is closed.
• Keep the device awake. The page asks the browser to keep the screen on where supported, but a phone that locks may silence the alarm.
• Lengths, not clock times. It counts 45 minutes from the moment you press Start, so it cannot be set to end at a particular time like 10:15.

For repeating study sessions with automatic breaks, use the Pomodoro timer and set the focus length to 45.

Before an important event, run through the page once. Press Start, check the sound level and test Full screen on the display you will use, so there are no surprises when other people are watching.