30 minute timer, a half hour with an alarm.

A 30 minute timer counts down 1,800 seconds and rings at zero. Thirty minutes is half an hour, long enough for a workout, a lesson or a proper meeting. This one has soft cues at halfway and with one minute left, a label, rounds, and full screen mode, and it shows the clock time it ends. It keeps correct time in a background tab.

How to use the 30 minute timer

1. Press Start or the space bar. The countdown begins at 30:00 and the line under the numbers shows the clock time it ends.
2. Pick a label under What is it for?, or type your own in Label. It shows above the countdown, in the tab title and in the alarm notification.
3. Choose Rounds if you want the 30 minutes to repeat. A single bell marks the end of each round and the next one starts at once.
4. Pick the alarm Sound and the Volume, and press Hear the sound to check it before you start.
5. Tick a soft cue if you want one: Soft chime at halfway, Soft chime when 1 minute is left or Tick the last 10 seconds.
6. Press Pause to hold the time and Resume to carry on. +1 min adds a minute. When it rings, press Stop the alarm, or Start again to run it once more.

Thirty minutes of activity

The CDC's page for adults says they need 150 minutes of moderate-intensity aerobic activity a week (CDC guidelines for adults, checked 24 Oct 2026). Divide 150 by 30 and you get five, so five sessions of 30 minutes add up to that figure. Pick the label Workout, press Start, and use the halfway chime as the point to change what you are doing. This page only counts time; it is not medical advice, and a doctor can say what is right for you.

Meetings, lessons and lunch

A half hour slot works when everyone can see the clock. Put the timer in full screen on a shared display. The halfway chime tells the room that 15:00 is left; the one minute left chime asks for the final decisions. A teacher can use the same pattern: 15 minutes of explaining and 15 of practice. For a lunch break, choose Chime so the end is gentle.

Deep work

Thirty minutes is a good block for work that needs thought, such as a report or a design. Close messaging, label the block Deep work, and start. The tab title shows the time left, so you can see it from another tab, and Keep the screen on stops the display from dimming while the page is in view.

Rounds of thirty minutes

30 minutes in other units

Need 35 minutes? Press +1 min five times, or type 35 in Any other time. For a longer session, step up to the 45 minute timer or the 60 minute timer.

A thirty minute plan

Divide a half hour lesson or session as 5 minutes to set up, 15 minutes for the main part and 10 minutes to practise or wrap up: 5 + 15 + 10 = 30. The halfway chime at 15:00 left falls in the middle of the main part. Pick the split that matches your own session and write it before you press Start.

Common problems

• The laptop went to sleep. Closing the lid or letting the computer sleep stops the page, so no alarm can ring. Keep it awake for the half hour.
• The alarm rang while you were away. It stops by itself after a minute. The notification option leaves a message you can read later.