TimerPlan15 Minutes timer
15 Minutes timer
0:00
Ends at —
Space starts and pauses · R resets
One thing a month worth timing
MonthlyOne thing a month worth measuring or capping with a clock — a payroll trap, a nap length, a meeting that never gets added up. Two sentences and the tool.
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What is a 15 minutes timer?
The Timerdial 15 minutes timer is a full countdown already set to 15 minutes: press start and it rings, keeps the screen awake, and shows the time left in the tab title. Fifteen minutes is the quarter hour: the unit timesheets round to, the length of a stand-up meeting, and the nap that leaves you clear rather than groggy. Almost every scheduling system in the world is built on it.
In other units that is 15:00 on a clock, 15 minutes, and 0.25 of an hour, so 4 of them fit into an hour and 96 into a day.
Because the finish is stored as an absolute clock time rather than counted in ticks, the countdown is exact after a spell in a background tab, and the alarm is booked into the audio clock the moment you press start — which is what lets it sound while the tab is frozen.
Press start, or press it after changing the length — this page is the ordinary timer with 15 minutes already in the box.
What people set 15 minutes for
a quarter-hour billing block, a power nap, a short study block, roasting vegetables, a stand-up meeting. Fifteen minutes is the quarter hour: the unit timesheets round to, the length of a stand-up meeting, and the nap that leaves you clear rather than groggy. Almost every scheduling system in the world is built on it.
| In this unit | 15 minutes is |
|---|---|
| Seconds | %!d(float64=900) |
| Minutes | 15 |
| Hours | 0.25 |
| On a clock | 15:00 |
| Written for the box | 15m |
| Fits into an hour | 4 times |
| Fits into a day | 96 times |
The address bar carries the length, so bookmarking this page keeps it, and adding ?auto=1 to the link starts the countdown as soon as it opens — useful on a shared screen where a click is one thing too many.
Next to it
Shorter: 12 minutes. Longer: 20 minutes.
Every length is listed on the timer by duration page. For a different kind of countdown, the countdown timer counts to a time of day instead of for a length, the kitchen timer runs several at once, and the pomodoro timer repeats work and break. To count upward instead, use the stopwatch.
Frequently asked questions
How long should a nap be?
Ten to twenty minutes, and fifteen is the safe middle. Beyond about twenty-five you enter deep sleep, and waking from that produces the heavy, disoriented feeling that makes people conclude naps do not suit them.
How many seconds is 15 minutes?
%!d(float64=900) seconds, which is 15:00 on a clock and 15 minutes as a decimal. The timer accepts every one of those forms in its box — 15m, %!d(float64=900), 15:00 — and they all set the same countdown.
Will a 15 minutes timer still ring if I switch tabs?
Yes. The alarm is scheduled into the audio clock at the moment you press start, so it sounds at the right time even if the tab has been frozen in the background since — unlike a page that only tries to make a sound once the time is up, by which point a throttled tab has already missed it. The remaining time is also written into the tab title and drawn into the tab icon, so you can read it without switching back.
How this works
Sources:
Reading a 15 minutes countdown
It is the same engine as every timer here. Absolute finish time, scheduled alarm, screen held awake — the only difference is that 15 minutes is already in the box.
The tab title carries it. So this page does not have to be the one you are looking at.
Nothing is stored. The length lives in the address bar, which is what makes a bookmark work.