30 minute timer

This page runs a 30 minute countdown and sounds an alarm when it ends. It works for anyone who needs to track a half hour block, from a meeting to a reading sprint.

or press Ctrl D (⌘ D on a Mac)

What fits inside 30 minutes

Thirty minutes is half an hour. It is 1,800 seconds. That is long enough for a full meeting block, a classroom quiz section, or a reading sprint. It is short enough that you can finish and move on without losing your day.

People set a 30 minute timer for many tasks. A common one is a meeting or presentation slot. Another is a reading sprint, where you read without checking your phone. A third is a rest between longer tasks, like a break after a workout set. A fourth is a timed exam section or a classroom activity. Each of these fits neatly into a half hour.

This timer counts down from 30 minutes by default. It uses your computer's clock, not a tick counter, so it stays accurate even if you switch tabs or your device sleeps. The tab title shows the remaining time, so you can read it from another tab. When time is up, a tone plays from your browser. You can choose beeps, a chime, or silent with a flashing tab title.

Frequently asked questions

How do I set a timer for 30 minutes?

Open the timer page. The default is often 30 minutes, but if not, type 30:00 in the duration field. Press Space to start. The countdown begins and the tab title shows the remaining time. When it reaches zero, an alarm sounds.

Can I change the 30 minute timer to a different length?

Yes. You can type a new duration in several formats. For example, 45m for 45 minutes, 1h for 1 hour, or 90s for 90 seconds. You can also type an exact clock time like 14:30 to count down to that moment.

Does the 30 minute timer keep running if I switch tabs?

Yes. The timer uses your computer's clock, not a tick counter, so it stays accurate even when the tab is in the background or your device sleeps. The tab title updates with the remaining time, so you can check it from another tab.