Online Timers

Pick a length and press Start — or set your own. Every timer has an alarm, big digits you can read across a room and a full-screen mode.

Preset timers

1 Minute Timer Reading-fluency checks, blood-pressure readings and quick drills. 2 Minute Timer Toothbrushing (the ADA’s two minutes) and the two-minute rule. 3 Minute Timer Boxing rounds and time-outs for three-year-olds. 5 Minute Timer Short breaks, classroom transitions and resting before a blood-pressure check. 10 Minute Timer Short walks and activity breaks that add up to 150 minutes a week. 15 Minute Timer Stand-up meetings, long breaks, the 15-15 rule and post-vaccine waits. 20 Minute Timer Power naps and the 20-20-20 rule for screen time. 30 Minute Timer Half-hour workouts, study blocks and the wait before a blood-pressure check. 45 Minute Timer Soccer halves, class periods and long study blocks. 1 Hour Timer Exams, kids’ daily activity and food left out on a hot day. 2 Hour Timer The two-hour food rule, sunscreen and screen breaks. Pomodoro Timer 25-minute focus sessions with automatic 5-minute breaks.

Set your own time

Countdown Timer Set any time in hours, minutes and seconds, up to 99 hours. Stopwatch Time how long something takes, with laps and splits. Holiday Countdowns Days until Christmas, Thanksgiving, Easter and more.

Which timer should I use?

Each preset page starts with one tap and explains what that length of time is typically used for — two minutes for brushing your teeth, three for a boxing round, twenty for a power nap or the 20-20-20 eye rule. For focused work, the Pomodoro timer runs four 25-minute sessions with breaks in between, automatically. If none of the presets fits, the countdown timer takes any hours, minutes and seconds, and +1 min on every preset adds time as you go.

How these timers keep time

The timers don’t count seconds one by one, which drifts and falls behind in background tabs. When you press Start they save the end time on your device’s clock and show the difference from the current time, so the display is right the moment you look. The alarm is generated in your browser with the Web Audio API — there are no sound files to load — and is scheduled for the end time in advance. The remaining time shows in the browser tab, and the screen is kept awake while a timer runs, where the browser supports it.