30 Minute Timer
Half an hour suits exams, extended projects and the main block of a lesson. A large countdown on the board takes the guesswork out of pacing for everyone.
How to use it
- The timer is already set to 30 minutes. Press Start or the Space bar to begin, and Space again to pause.
- Press Present (or F) to show it full screen. Pick Pie, Bar or Digits, and choose an end sound.
- When time is up you'll hear the chime and see "Time's up!". Press Start again for another round, or +1 min if the class needs longer.
Ways to use a 30 minute timer in class
- Mock exam section: timed conditions with a clear end signal.
- Extended project time: plan a check-in when the bar reaches halfway.
- Main lesson task: a long independent activity before the plenary.
Other timer lengths
Questions teachers ask
Will a thirty-minute timer stop if my screen locks?
The timer keeps exact time either way, and while it runs the page asks the device to keep the screen on. If the screen does lock, the time is still correct when you return.
Can I add extra time for students who need it?
Press +1 min as many times as you like, even while the timer is running. For different finish times, open a second tab with its own timer.
Does the timer keep going if I switch tabs or my laptop is busy?
Yes. The timer works from the clock, not by counting ticks, so it stays exact if you switch to your slides or another tab. The end sound still plays when time is up.
Will my screen go to sleep while the timer runs?
In most browsers, no. While a timer is running the page asks the device to keep the screen on, and lets it sleep again when you pause or the time is up.
Can students see it from the back of the room?
Press Present (or the F key) for a full-screen timer with huge digits. Choose Digits for the largest numbers, or Pie for a shape younger students can read without telling the time.