A 15 second timer is handy for a quick reaction game, a plank hold, or hand-washing. 15 second is 15 seconds. Second timers are perfect for workouts and games.
Need a different length? Type any time in the box above, or use +1 min while it runs. Pick a louder sound like School bell if you are across the room.
Teaching? Our sister site has a classroom timer with a noise meter, student picker and seating charts.
Frequently asked questions
How do I set a timer for 15 second?
Just press Start on this page. The timer is already set to 15 second. Press the space bar to pause and resume.
How many seconds is 15 second?
15 second is 15 seconds.
Is TimerTab free?
Yes. Every clock, timer and alarm is free, with no account and no download. It works in any modern browser on desktop, phone or tablet.
Will it keep time if I switch tabs?
Yes. TimerTab counts from the real clock time instead of counting ticks, so it stays accurate when the tab is in the background and catches up instantly when you come back.
Does it work offline?
Yes. After your first visit the pages are cached on your device, so timers, the stopwatch and alarms keep working without an internet connection.