90 Minute Timer
This is a free online 90 minute timer built for focus. Press start and it counts down a full 90 minutes, then rings and rolls you into a 18-minute break. You can also press “Float” to pop the countdown into a small always-on-top window that stays visible while you work in another app.
A 90-minute block is good for a full ultradian cycle — the body's natural ~90-minute focus rhythm. Because the timer runs on a real wall-clock deadline, it keeps perfect time even if you switch tabs, lock your screen, or reload the page — so you can trust the count and forget about it. It works well with the Pomodoro Technique: focused sprints separated by short breaks.
A 90-minute block roughly matches an ultradian focus cycle — the body's natural rhythm of alertness followed by a dip. Treat the chime at the end as a hard stop to actually rest, not just a suggestion; a session this long only pays off if the break after it is real.
Other timer lengths
Frequently asked questions
How do I start a 90 minute timer?
Just press the Start button — the timer is already set to 90 minutes on this page. You can pause, reset, or skip at any time.
Can the 90 minute timer run in the background?
Yes. Press “Float” to open a small always-on-top Picture-in-Picture window, or simply leave the tab open — the countdown stays accurate either way because it is based on a real clock deadline.
Will it make a sound when the 90 minutes are up?
If you allow notifications, you’ll get a desktop notification when the session ends. The on-screen timer also clearly shows when a session is complete.
Is 90 minutes too long for one focus session?
For most tasks, yes — unless you're in genuine deep work. If your attention drifts well before the timer ends, switch to a shorter preset instead of forcing out the full block.
Will it remember my completed sessions?
Yes. Your finished focus sessions are saved locally in your browser so you can see how many you have completed today and in total.