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Online 90 minutes countdown timer. Starts automatically with 15 alarm sounds to choose from. Fullscreen mode for classrooms and big screens.
This 90 minutes countdown timer starts automatically. When the time is up, you'll hear an alarm sound. Keep this browser tab open and your volume turned up.
A 90-minute timer matches one full sleep cycle and is the ideal nap duration for complete rest without grogginess. Also used for movie watching, long study sessions, and extended deep-work blocks.
A 90 minutes timer is great for deep work sessions, exams, movie watching, or baking. Choose from 15 alarm sounds including loud fire alarms and sirens, adjust how long the alarm rings, and customize the display with 60+ fonts and multiple color themes. Hit fullscreen to use it on a big screen, projector, or classroom TV.
The timer starts counting down as soon as this page loads. When it reaches zero, your selected alarm sound plays. You can pause, resume, or reset the timer at any time using the controls. To change the alarm sound, click the sound icon and choose from options like Classic Bell, Fire Alarm, Radar Ping, Rooster, and more. Adjust the ring duration from 30 seconds up to 10 minutes depending on how loud and long you need it.
Long timers like 90 minutes work best as background monitors for extended activities. Set the timer, start your task, and let it run in a separate tab or on a secondary screen. The alarm sound will alert you when time's up, even if you've shifted your attention elsewhere. Great for slow-cooking recipes, long study marathons, and timed creative work.
No app or download needed — works instantly in any modern browser on phones, tablets, laptops, and desktops. Bookmark this page to quickly return to your 90 minutes timer anytime. You can also share this timer with others using the share button — they'll get the exact same timer with your settings.
Need a different kind of timer? Try the Pomodoro Timer for structured work sessions with automatic breaks, the Interval Timer for HIIT and circuit training, or the Classroom Timer for visual countdowns with fun animations. For tracking multiple things at once, use Multiple Timers.