15 Second Timer
A 15 second timer that is ready to go. Press Start, or the space bar, and it counts down 15 seconds and then sounds the alarm.
15 seconds
Spacestart / pauseRresetFfull screen+ −add or remove a minute0–9type a time
Good for 15 seconds
- Count your pulse for 15 seconds and multiply by 4 to get beats per minute.
- The rest half of a 45/15 interval round: 45 seconds on, 15 seconds off.
Other timers
Questions people ask
Will the 15 seconds timer still go off if I switch tabs?
Yes. The end time is fixed when you press Start, so the countdown stays correct in a background tab and the alarm sounds on time as long as the tab stays open. If you turn on “Notify me”, you also get a notification.
What happens if I close the page or my computer sleeps?
The end time is saved on this device. Reopen the page and the timer shows the correct time left, or tells you how long ago it finished. A closed tab or a sleeping device cannot play the alarm.
Can I change it from 15 seconds?
Yes. Use the + and − steppers or type a new time, press + or − on a keyboard to add or remove a minute, or open the main timer to save your own presets.