TimerPlan12 Minutes timer
12 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 12 minutes timer?
The Timerdial 12 minutes timer is a full countdown already set to 12 minutes: press start and it rings, keeps the screen awake, and shows the time left in the tab title. Twelve minutes is the Cooper test — run as far as you can and the distance estimates aerobic fitness. It is also exactly a fifth of an hour, which makes it a tidy slot in a lesson plan.
In other units that is 12:00 on a clock, 12 minutes, and 0.2 of an hour, so 5 of them fit into an hour and 120 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 12 minutes already in the box.
What people set 12 minutes for
the Cooper test, rice by absorption, a pizza in a hot oven, a fifth of an hour. Twelve minutes is the Cooper test — run as far as you can and the distance estimates aerobic fitness. It is also exactly a fifth of an hour, which makes it a tidy slot in a lesson plan.
| In this unit | 12 minutes is |
|---|---|
| Seconds | %!d(float64=720) |
| Minutes | 12 |
| Hours | 0.2 |
| On a clock | 12:00 |
| Written for the box | 12m |
| Fits into an hour | 5 times |
| Fits into a day | 120 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: 10 minutes. Longer: 15 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
What is the Cooper test?
A twelve-minute run for distance, devised for the US military in 1968 and still used as a field estimate of aerobic capacity. It works because twelve minutes is long enough to be aerobic and short enough that pacing errors show up in the distance rather than in the finish.
How many seconds is 12 minutes?
%!d(float64=720) seconds, which is 12:00 on a clock and 12 minutes as a decimal. The timer accepts every one of those forms in its box — 12m, %!d(float64=720), 12:00 — and they all set the same countdown.
Will a 12 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 12 minutes countdown
It is the same engine as every timer here. Absolute finish time, scheduled alarm, screen held awake — the only difference is that 12 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.