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12 minute timer
Twelve minutes, loaded and ready. Press start.
Ready
12:00Add or take time off while it runs with the buttons under the clock. The countdown is worked out from the clock, so a tab left in the background comes back correct.
The end sound is generated in your browser, so nothing is downloaded and it works offline.
Space start or pause · R reset · F full screen
No signup · No accounts · Free forever
Activity presets
Twelve minutes is best known as the length of the Cooper test, a fitness assessment developed by Dr. Kenneth Cooper that measures how far you can run in exactly twelve minutes as a proxy for aerobic fitness. It is also a reasonable length for a short meeting, a longer classroom task, or a workout circuit with a few rounds built in.
The countdown loads pre-set to twelve minutes here, full screen and legible across a track, gym or classroom, with the same silent-mode and background-tab accuracy as every duration on this site.
Need a different length? The full timer page has quick presets from ten seconds to ten minutes plus a custom field for anything else, and pairs well with charades cards, bingo cards and word searches if you are running a game rather than a work session.
FAQ
Is this timer free?
Yes, completely, no signup, no account and no limit on how many times you run it. Pick it and press start.
What is the Cooper test?
A fitness test where you run or walk as far as possible in exactly twelve minutes, with the distance covered used as an estimate of aerobic fitness. This timer covers the twelve minutes; it does not measure or record distance.
Does it keep correct time in a background tab?
Yes. The countdown is worked out from the clock rather than counted tick by tick, so a tab you switched away from comes back showing the correct time even if the browser paused it while it was hidden.