15 Second Timer
Fifteen seconds is a quarter of a minute: the transition gap in 45/15 circuits and a common short-video length. Press Start and it rings at zero, even if you switch tabs.
Space start/pause · R reset · F full screen
Alarm & notification settings
Sound needs one tap on the page first (a browser rule). Keep this tab open: closing it stops every timer’s alarm. Why timers stay accurate in background tabs.
What people time with 15 seconds
- The 15-second switch between circuit stations
- Rehearsing a short video clip or voice-over
- A rapid-fire round in a party game
- Short breath holds or balance holds
15 seconds in other units
| Seconds | 15 |
|---|---|
| Minutes | 0.25 |
| Hours | 0.0042 |
| Share link | countdownpro.app/?t=15s |
Questions
How do I set a 15 seconds timer?
Press Start on this page. The 15 seconds countdown begins at once and rings when it reaches zero. You can also press the space bar to start and pause.
How many seconds are in 15 seconds?
15 seconds is 15 seconds.
Will it still ring if I switch to another tab?
Yes, while the tab stays open. The alarm is scheduled for an exact end time when you press Start, so a background tab does not delay it. Turn on notifications to get a system alert too.
Can I run this alongside other timers?
This page runs one big timer. For several at once, open the main countdown timer board, which runs any number of labelled timers side by side.