Timer Alarm
Timer Alarm — runs in your browser. Inputs are not stored.
Timer alarm
Enter values, then press Calculate.
Set minutes and seconds, then count down. The beep plays only after a user gesture, per browser policy.
How to use
- Enter Minutes and Seconds. Minutes are 0–999 and seconds are 0–59. The default is 5 minutes 0 seconds.
- Leave Beep when finished (AudioContext) checked to play a short sine wave when time is up. Uncheck it to only show 00:00.
- Press Start to switch to running and count Time remaining down as mm:ss. If minutes plus seconds are 0, you are asked to enter a time.
- Press Stop to pause. Starting again begins a new countdown from the minutes and seconds in the fields; it does not resume from the leftover time.
- Reset returns the state to idle and sets the remaining-time display to the current field values.
- If you need sound, turn the checkbox on before you press Start. Some browsers allow audio only after a click.
Key concepts
A timer alarm counts N minutes and N seconds from now, not a clock time. That is different from a countdown timer that uses a calendar date and time. The display is minutes:seconds; deadlines longer than a day fit a countdown timer or D-day tool better.
The beep is a short 880 Hz sine wave from Web Audio’s AudioContext. Audio is woken at start, so it is safest to press Start with the checkbox on. Background tabs may have their timers delayed by the browser. Do not enter more than 59 seconds; 90 seconds is 1 minute and 30 seconds. It is meant for short focus sessions such as cooking or a Pomodoro; multi-day deadlines belong on a countdown timer.
Example
To boil eggs for 7 minutes, set minutes to 7, seconds to 0, enable the beep, and start. When remaining time hits 00:00 and the status is complete, a short sound plays. If the tab is behind another window, the sound can be late or blocked, so keep this tab open while cooking. For coffee, start with 4 minutes and 0 seconds. If the sound is annoying, uncheck it and watch the completed status on screen.
Related: Repeat timer · Stopwatch · Countdown timer
Frequently asked questions
Why can’t I hear the timer alarm beep?
The browser may block sound until you click. Press Start once with Beep when finished checked to allow audio. Also check mute and tab mute.
If I stop the timer alarm and start again, does it resume?
No. Start creates a new countdown from the minutes and seconds in the fields. To continue from a leftover value, enter those minutes and seconds again.
What is the maximum timer alarm duration?
Minutes up to 999 and seconds up to 59. For longer deadlines, use a countdown timer with a target date and time.
Are timer alarm values saved?
No. It runs only in the browser and is not sent to a server.
How does a timer alarm differ from a repeat timer?
A timer alarm counts once and stops. If you need the same interval over several rounds with a beep each time, use the repeat timer.
Is the timer alarm accurate in the background?
Not always. Some browsers throttle timers in hidden tabs. For important alarms, keep the tab in front or use the device’s clock app.
Last reviewed: 2026-09-04