Set a 15 minute timer
The timer is set to 15 minutes. Press Start, or Space, and the countdown runs while you work.
- Runs on your device
- No sign-up
- Works offline after a visit
| Lap | Lap time | Total |
|---|
Keys: Space starts or pauses, R resets, and L records a lap on the stopwatch.
This page opens with 15 minutes in the fields, so the display reads 15:00. Fifteen minutes is 900 seconds, a quarter of an hour. Once you press Start, the countdown runs from the clock, so switching to another tab keeps the time accurate and the tone sounds at the end.
A quarter of an hour suits one focused block with a clear end, such as a short study session or a review of a single document. Decide what you want to finish before you press Start, so the tone tells you when to check your progress. For a block twice as long, use the 30 minute timer.
How to set a countdown timer
- Pick a preset, or type hours, minutes and seconds, then press Start.
- Switch to Stopwatch for laps, and press Lap or L to record each one.
- Switch tabs if you like. The time stays right, and a tone sounds when a timer reaches zero.
Questions
Can I type 90 seconds or 75 minutes?
Yes. The minutes and seconds fields accept numbers above 59, so 90 seconds counts as one and a half minutes and 75 minutes as an hour and a quarter. Hours go up to 99.
What if I need 20 minutes instead?
Type 20 into the minutes field before you press Start, and the countdown runs for 20 minutes instead of 15.
Why does the timer stay accurate when I switch tabs?
It reads the clock rather than counting ticks. When it starts, it saves the end time, and each update subtracts the current time from that. Browsers slow down timers in background tabs, so a counter that adds one per tick can drift. This one does not.
Will the sound play if the tab is in the background?
The tone is made in the browser and scheduled on the audio clock when the timer starts, so it sounds at the end time even if the tab is in the background. The page title shows the time left while it runs. Your device volume and mute settings still apply, and on phones the browser may stop sound when the screen locks, so keep the page open and the volume up.
Does the screen stay on while the timer runs?
Only if you tick the box, and only where the browser supports the Screen Wake Lock. The browser releases the lock when the tab is hidden, so the page asks again when you come back.
What do the lap times mean?
Each lap time is the time since the previous lap, and the total is the time since the stopwatch started. Reset clears the laps. Nothing is saved after you close the page.
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