90 Minute Timer — Free Online Countdown

Need a 90 minute timer? Press start above for a free hour-and-a-half countdown with an alarm. It runs in your browser, keeps accurate time in the background, and can go full screen. Adjust with −1/+1 or type any length into the box.

Why 90 Minutes?

Ninety minutes is a popular length for deep, uninterrupted work — long enough to get fully absorbed in a hard problem, then stop for a proper break before your focus fades. Many writers, programmers and students plan their hardest task of the day as a single 90-minute block, usually first thing.

Good Uses for a 90 Minute Timer

• Exam practice — a number of school and university papers run for around 90 minutes plus reading time. Rehearse against the clock with a past paper. Our silent exam timers are built for this.
• Deep work — one important task, notifications off, phone out of the room. Our guide to keeping your phone from wrecking your focus helps.
• A long study session — one subject, then a 15 to 20 minute break.
• Films, games and events — many movies and matches land around the 90-minute mark.

Too Long in One Go?

If ninety minutes feels like a slog, split it into three Pomodoro rounds with the 25 minute timer and short breaks — you'll cover the same ground with less fatigue.

Where does the 90-minute rule come from? It borrows from sleep research and a famous study of violin students, but a built-in 90-minute daytime cycle has never been confirmed. The Interval Atlas explains the evidence and when a 90-minute block is worth it.

90 Minute Timer Video

Prefer a video version? Play the same countdown on YouTube — handy on a TV, classroom projector or second screen. Silent while it runs, with a gentle chime at the end.

Opens the YouTube player only when you press play. More free timer videos on our YouTube channel.

90 Minute Timer — FAQ

Does the timer keep running if I switch tabs?

Yes. The countdown is based on the clock, not the tab, so it stays accurate in the background and the alarm is scheduled to sound on time. The time left also shows in the browser tab title.

Should I take breaks during a 90 minute session?

It depends on the task and on you. Many people work the full 90 minutes and then take a real 15 to 20 minute break; others prefer shorter Pomodoro rounds. Try both and keep what works.

Is it free?

Completely free, with no sign-up, no app and no ads.