Timers › 15 Minute Timer
15 Minute Timer
Press Start for a 15:00 countdown. The ring shows how much of the quarter-hour is left, and the alarm rings at zero until you stop it.
Time is up
Keys: Space start/pause · R reset · F full screen · M mute · Esc stop alarm
Good uses for a 15 minute timer
- A focused study or homework block
- A quarter-hour stand-up or meeting slot
- Folding laundry or a "15-minute tidy"
- A rest or nap that stays short
- Practice for an instrument
- A timed section of a practice exam
Tips
- The ring changes colour when a quarter of the time is left and again in the last tenth, so you can see the end coming at a glance.
- Press Copy link to send the same 15-minute timer to someone else.
- Choose None as the sound if you only want a visual alarm.
15 minutes in other units
| Unit | 15 minutes |
|---|---|
| Minutes | 15 |
| Seconds | 900 |
| Hours | 0.25 |
| Milliseconds | 900,000 |
Questions and answers
What does the ring colour mean?
Green while more than a quarter of the time is left, amber in the last quarter, red in the last tenth and when time is up.
How many seconds is 15 minutes?
900 seconds. It is a quarter of an hour (0.25 h).
Does the timer keep running if I switch tabs?
Yes. TimerNook works out the time left from your device clock and a fixed end time, not by counting ticks, so a background tab is still right. While a timer runs, the page also plays a tone too quiet to hear, so the browser keeps the tab awake; your browser may show a speaker icon on the tab. If you also tick "Notify me", you get a system notification at the end.
Will the alarm ring if my phone screen locks?
Not always. Phone browsers can pause web pages when the screen locks, and an iPhone on silent can mute browser sound. Keep the screen on; while the timer runs TimerNook asks the browser to keep the screen awake where that is supported. If the page was paused, the alarm rings as soon as you return.