Online Timer

How to use the timer

Tap one of the Quick set buttons — 1, 3, 5, 10, 15, 20, 30, 45 or 60 minutes — or type hours, minutes and seconds, then press Start. While it runs, the page shows the time left in large digits, a progress bar, and the clock time when it will end, such as Ends at 3:42 PM. Pause holds the remaining time, +1 min adds a minute, and Reset goes back to the length you set. When time is up, the display turns red, the alarm beeps once a second for up to a minute, and phones that support it vibrate; press Stop to silence it.

The time left also appears in the browser tab’s title, so you can see it while working in another tab. The share link saves the length — send a “25-minute timer” link to a study group and each person starts their own.

Accurate in the background

Many simple timers count down by subtracting one second at a time. Browsers slow those steps down in background tabs and on locked phones, so the timer falls behind. This one stores the moment it will end and computes the remaining time from your device’s clock every time the screen updates, so switching tabs for ten minutes does not change when it ends. The sound is generated with the Web Audio API, which browsers allow only after you tap the page — one reason to press Start yourself. Keep the screen on uses the Screen Wake Lock API to stop a phone from locking while the timer runs, which helps in the kitchen or at the gym; browsers that do not support it simply ignore the switch.

Common timer lengths

The Pomodoro Technique alternates 25 minutes of focused work with a 5-minute break and takes a longer break after four rounds. Use the 5-minute preset for the break, or +1 min to stretch it.

Timers, durations and clock times

To find how long it is between two clock times — when a 45-minute timer started at 2:20 will end, or how long a meeting lasted — use the time duration calculator. To add up several durations, the time calculator; to convert minutes and seconds, minutes to seconds; and for hours worked across a shift, the hours calculator.