15 Minutes Hourglass Timer — Free Online Sand Timer
Free 15-minute hourglass timer with animated sand particles. Great for study breaks and short focus sessions.
Why a 15 minutes hourglass?
Fifteen minutes is the Pomodoro long break — and a classic 'minimum viable work' block. Long enough for genuine progress, short enough to repeat multiple times without fatigue.
What people use a 15 minutes hourglass for
Pomodoro long break
After every 4 Pomodoros (about 2 hours), take a 15-minute long break. Walk, snack, leave the desk completely.
Power nap (extended)
15-20 minutes is the upper edge of the "no-sleep-inertia" window. NASA found 26 minutes optimal for pilots; many people peak at 15.
Email triage
Cap email processing at 15 minutes per session. Inbox-zero advocates recommend 2-3 such sessions per day, not constant checking.
Quick workout
A 15-minute bodyweight circuit (squats, push-ups, planks, lunges) covers the basics on rest days.
Reading session
A 15-minute reading block, repeated daily, is enough to finish ~25 books per year at average reading speed.
The 15 minutes interval, in context
Habit researchers describe 15 minutes as the '1% improvement window' — what James Clear calls the daily compound interval. Most habit-stacking systems anchor around 15-20 minute blocks because they're long enough to feel meaningful and short enough to never miss.
For shorter focus, see the 5- or 10-minute hourglass. For deeper work, the 30-minute version supports a full Pomodoro long block.
15 Minutes Hourglass Timer
Free 15-minute hourglass timer with animated sand particles. Great for study breaks and short focus sessions.
Related
15 Minutes hourglass FAQ
How long does a 15 minutes hourglass run?
This hourglass timer runs for exactly 15 minutes (900 seconds). The sand animation flows in real time, and an alarm sounds when the timer finishes.
Can I use the 15 minutes hourglass for board games?
Yes — board games like Pictionary, Scrabble, Catchphrase, and Codenames typically use a 15-minute turn timer. The visual sand flow makes it easy for all players to see how much time remains without checking a phone screen.
Can I reset the hourglass before the 15-minute timer is up?
Yes. Click the reset button at any time to flip the hourglass and start the 15-minute countdown from the beginning. The sand returns to the top chamber and you can start fresh.
Does the alarm sound at the end of the 15-minute timer?
Yes. When the last sand grain reaches the bottom chamber after 15 minutes, the timer plays a soft alarm. You can change the alarm sound (Warm, Chime, Bright, or None) using the selector under the timer.
Can I run the 15 minutes hourglass in fullscreen mode?
Yes. Click the Fullscreen button in the top-right corner of the timer panel to expand the hourglass to fill your screen — useful for classroom display, group activities, or distraction-free meditation.