15 Minute Timer
Free online 15 minute countdown timer with alarm
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Customise colour, duration and size →Use in Google Docs or Canva →About the 15 Minute Timer
A 15 minute countdown that keeps running in a background tab and tells you the clock time it will finish at. Fullscreen it for a room to see, add rain or brown noise while it runs, and get an alarm at zero.
TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.
Common Uses
- Focused work sprint
- Walking break
- Cooking prep time
- Reading session
- Email time-box
How to Use the 15 Minute Timer
- Press Start — or the Space bar — to run the 15 minute countdown. Space also pauses and resumes it; R resets it
- Adjust by 1 minute with the +/- buttons while it runs, toggle Repeat to loop it, and check the finish time shown under the display
- Use the Fullscreen control below the timer for a room-sized countdown (Esc to exit)
- Choose or mute the alarm in the header's sound settings, and pick a background sound — rain, ocean, fireplace or brown noise — that fades out at zero
- Enable notifications to be alerted when your 15 minute timer finishes in a background tab, and add
?autostart=1to the link to start the countdown on load
Frequently Asked Questions
How long is 15 minutes?
15 minutes is exactly 900 seconds, or 0.3 of an hour. Our free 15-minute timer counts down precisely and alerts you when time is up.
What can I do in 15 minutes?
A 15 minute timer is great for focused work sprint, walking break, cooking prep time. Set it and focus on your task — the alarm will let you know when time is up.
Does the timer work in the background?
Yes, our timer continues running even if you switch to another tab or minimize your browser. Enable notifications to get alerted when it finishes.
Does the alarm sound when the timer finishes?
Yes, an alarm plays automatically the moment the 15 minute countdown reaches zero, with an optional vibration on mobile. Enable notifications for an extra system alert, even from a background tab.
Can I make the timer fullscreen?
Yes, use the Fullscreen control below the timer to expand the countdown to your whole screen — great for classrooms, presentations, and workouts. Press Esc to exit fullscreen.
Can I use the 15 minute timer on my phone?
Yes, our 15 minute timer is fully responsive and works on all devices including iPhone and Android. Open this page in your mobile browser and tap Start.