Tools / Calculators

Single Timer

Set hours/minutes/seconds and count down — a sound and the tab title let you know when it's done.

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Single Timer

Waiting05:00

Set to5m

Ends at—

Progress0%

Duration

Changing this resets to the start

hms

Notifications

SoundVolume60%

Countdown beep for the last 3 seconds

Shortcuts

Space Start/stopR ResetM Mute

Settings are stored only in this browser. The remaining time shows in the tab title even when you’re on another tab, and time that passed while the screen was off is caught up using the real clock. Sounds are synthesized in your browser, so nothing is downloaded.

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Tool info

Category Calculators

Processing Directly in your browser

Data storage Stored only in this browser

Updated 2026-08-29

How to use

Enter hours, minutes, and seconds — it takes effect right away.

Click "Start" to begin the countdown. You can pause and resume, and adjust the remaining time on the fly with the −1m/+1m/+5m buttons.

When time's up, your chosen sound plays, and the remaining time shows in the tab title so you notice even on another tab.

FAQ

자주 묻는 질문

Q1. Will I get notified if I'm on another tab?

Yes. While counting down, the remaining time updates live in the tab title, and your chosen sound plays when it hits zero.

Q2. Does it stay accurate while the screen is off?

Yes. The remaining time is recalculated from the actual end time rather than counted by interval ticks, so time that passed while the screen was off or you were on another tab is caught up exactly.

Q3. I don't hear the alarm sound.

Browsers require at least one interaction with the page (like a click) before audio can play. Since you have to click Start, it should play normally in most cases — you can also preview it with "Test sound".

Q4. Can I pause and resume?

Yes. After pausing, clicking Start again continues the countdown from where it left off. You can also nudge the remaining time with the −1m/+1m/+5m buttons.

Q5. Can it repeat the same duration multiple times?

This tool only counts down once. For repeating the same duration automatically, with an optional rest between rounds, use the Repeat Timer instead.

Favorites

Related tools

↻ Repeat Timer

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