Pick a duration
Use a quick preset or open Settings to create a countdown with the exact number of days, hours, minutes, and seconds you need.
Countdown Timer
05:00
Set your time and start.
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Popular timers
Start a timer in one click
Every preset opens a dedicated timer page with the duration pre-loaded, helpful context, and internal links to related countdowns.
Seconds
1s Camera shutter 2s Quick countdown 3s Countdown start 4s Short burst 5s Reaction time 6s Vine loop 7s Lucky interval 8s Quick check 9s Brief pause 10s Deep breath 11s Eleven seconds 12s Twelve seconds 13s Unlucky pause 14s Two-week sprint 15s Ad skip 16s Sweet sixteen 17s Seventeen seconds 18s Eighteen seconds 19s Nineteen seconds 20s Eye rest 21s Twenty-one seconds 22s Twenty-two seconds 23s Twenty-three seconds 24s Twenty-four seconds 25s Short burst 26s Twenty-six seconds 27s Twenty-seven seconds 28s Twenty-eight seconds 29s Twenty-nine seconds 30s Quick burst 31s Thirty-one seconds 32s Thirty-two seconds 33s Thirty-three seconds 34s Thirty-four seconds 35s Sprint interval 36s Thirty-six seconds 37s Thirty-seven seconds 38s Thirty-eight seconds 39s Thirty-nine seconds 40s Plank check 41s Forty-one seconds 42s Answer to everything 43s Forty-three seconds 44s Forty-four seconds 45s Short interval 46s Forty-six seconds 47s Forty-seven seconds 48s Forty-eight seconds 49s Forty-nine seconds 50s Almost a minute 51s Fifty-one seconds 52s Fifty-two seconds 53s Fifty-three seconds 54s Fifty-four seconds 55s Nearly there 56s Fifty-six seconds 57s Fifty-seven seconds 58s Fifty-eight seconds 59s Almost a minute
Minutes
1m Tooth brushing 2m Full brush cycle 3m Soft-boiled egg 4m Hard-boiled egg 5m Coffee & breaks 6m Pasta check 7m Ramen noodles 8m Fresh pasta 9m Brew timer 10m Power break 11m Eleven minutes 12m Twelve minutes 13m Thirteen minutes 14m Fourteen minutes 15m Power nap 16m Sweet spot 17m Seventeen minutes 18m Eighteen minutes 19m Nineteen minutes 20m NASA nap 21m Twenty-one minutes 22m Twenty-two minutes 23m Twenty-three minutes 24m Twenty-four minutes 25m Pomodoro session 26m Twenty-six minutes 27m Twenty-seven minutes 28m Twenty-eight minutes 29m Twenty-nine minutes 30m Cardio block 31m Thirty-one minutes 32m Thirty-two minutes 33m Thirty-three minutes 34m Thirty-four minutes 35m Extended session 36m Thirty-six minutes 37m Thirty-seven minutes 38m Thirty-eight minutes 39m Thirty-nine minutes 40m Yoga routine 41m Forty-one minutes 42m Answer to everything 43m Forty-three minutes 44m Forty-four minutes 45m Study session 46m Forty-six minutes 47m Forty-seven minutes 48m Forty-eight minutes 49m Forty-nine minutes 50m Extended focus 51m Fifty-one minutes 52m Fifty-two minutes 53m Fifty-three minutes 54m Fifty-four minutes 55m Almost an hour 56m Fifty-six minutes 57m Fifty-seven minutes 58m Fifty-eight minutes 59m Fifty-nine minutes
Hours
1h Full work block 2h Deep work 3h Half workday 4h Morning session 5h Study marathon 6h Quarter day 7h Long shift start 8h Full workday 9h Extended shift 10h Long haul 11h Nearly half day 12h Half day 13h Afternoon block 14h Long project 15h Extended day 16h Two shifts 17h Full day plus 18h Three quarters 19h Night stretch 20h Marathon block 21h Nearly a day 22h Full day minus 23h Almost a day 1d Full day 1d Beyond a day 1d Twenty-six hours 1d Twenty-seven hours 1d Twenty-eight hours 1d Twenty-nine hours 1d Thirty hours 1d Thirty-one hours 1d Thirty-two hours 1d Thirty-three hours 1d Thirty-four hours 1d Thirty-five hours 1d Thirty-six hours 1d Thirty-seven hours 1d Thirty-eight hours 1d Thirty-nine hours 1d Standard workweek 1d Forty-one hours 1d Answer to everything 1d Forty-three hours 1d Forty-four hours 1d Extended workweek 1d Forty-six hours 1d Forty-seven hours 2d Two full days 2d Forty-nine hours 2d Fifty hours 2d Fifty-one hours 2d Fifty-two hours 2d Fifty-three hours 2d Fifty-four hours 2d Fifty-five hours 2d Fifty-six hours 2d Fifty-seven hours 2d Fifty-eight hours 2d Fifty-nine hours 2d Sixty hours 2d Sixty-one hours 2d Sixty-two hours 2d Sixty-three hours 2d Sixty-four hours 2d Sixty-five hours 2d Sixty-six hours 2d Sixty-seven hours 2d Sixty-eight hours 2d Sixty-nine hours 2d Seventy hours 2d Seventy-one hours 3d Seventy-two hours 3d Seventy-three hours 3d Seventy-four hours 3d Seventy-five hours 3d Seventy-six hours 3d Seventy-seven hours 3d Seventy-eight hours 3d Seventy-nine hours 3d Eighty hours 3d Eighty-one hours 3d Eighty-two hours 3d Eighty-three hours 3d Eighty-four hours 3d Eighty-five hours 3d Eighty-six hours 3d Eighty-seven hours 3d Eighty-eight hours 3d Eighty-nine hours 3d Ninety hours 3d Ninety-one hours 3d Ninety-two hours 3d Ninety-three hours 3d Ninety-four hours 3d Ninety-five hours 4d Four full days 4d Ninety-seven hours 4d Ninety-eight hours 4d Ninety-nine hours 4d One hundred hours
Days
1d One-day sprint 2d Weekend project 3d Three-day goal 4d Four-day push 5d Work week 6d Six-day stretch 1w Week-long goal 1w Eight-day plan 1w Nine-day run 1w Ten-day challenge 1w Eleven days 1w Twelve days 1w Thirteen days 2w Two-week sprint 2w Half-month goal 2w Sweet spot 2w Seventeen days 2w Eighteen days 2w Nineteen days 2w Twenty-day goal 3w Three-week plan 3w Twenty-two days 3w Twenty-three days 3w Twenty-four days 3w Extended goal 3w Twenty-six days 3w Twenty-seven days 4w Twenty-eight days 4w Twenty-nine days 1mo Month-long goal 1mo Thirty-one days
Countdown Timer
What is an Online Countdown Timer?
A countdown timer counts down from a duration you set and alerts you the moment it reaches zero. ClockUnit's free online timer is built for fast, distraction-free timing across study sessions, workouts, meetings, and daily routines.
How it works
How to Use the Countdown Timer
Start the countdown
Press Start and the timer begins immediately. The page title updates while it runs so you can track time from another tab too.
Hear the alert
When time runs out, ClockUnit plays the alarm and can show a browser notification. Restart, reset, or let it repeat automatically.
Features
Everything You Need in a Timer
Built for cooking, workouts, studying, and anywhere exact timing matters.
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Custom Duration for Any Countdown
Set days, hours, minutes, and seconds in Settings so the timer matches anything from a 20-second drill to a multi-hour deep-work block.
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One-Click Preset Durations
Jump into common times instantly with preset buttons and dedicated slug pages for high-intent countdown searches.
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Alarm Sound and Volume Control
Choose a sound, preview it before saving, and dial the volume to the level that works for your desk, kitchen, or workout space.
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Auto-Repeat for Intervals
Turn on repeat and the timer restarts automatically when it reaches zero, which is perfect for recurring drills and tabata-style sessions.
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Extend the Countdown Mid-Flow
Need more time? Add one minute without interrupting the countdown so you can keep moving instead of resetting the tool.
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Private, Local-Only Settings
Your timer preferences and completed-count stats stay in your browser. No login, no sync account, and no unnecessary tracking.
Use cases
Use the Timer For Anything
One countdown tool for everyday tasks, routines, and longer focused sessions.
Cooking
Use accurate countdowns for eggs, tea, pasta, baking, and anything else that relies on timing.
Exercise
Run workout intervals, rest periods, circuits, EMOM rounds, and recovery timers without extra setup.
Study
Set reading blocks, quiz drills, writing sprints, and timed revision windows with a clean focus-first display.
Meditation
Count down quiet sits, breathing sessions, and mindfulness practice without constantly checking the clock.
Gaming
Track cooldowns, queue breaks, timed challenges, and screen-time limits with one visible countdown.
Work
Use timers for meetings, presentation pacing, time-boxed tasks, and intentional breaks through the day.
FAQ
Countdown Timer — Frequently Asked Questions
What is an online countdown timer?
An online countdown timer counts down from a duration you choose to zero and alerts you when time is up. ClockUnit's timer runs directly in the browser with no install or account required.
Can I set the timer for any duration?
Yes. You can choose a preset or set a custom duration in days, hours, minutes, and seconds through the settings drawer.
Does the timer keep running when I switch tabs?
Yes. The countdown continues in the background, and the browser tab title updates live so you can glance at the remaining time without returning to the page.
Can I add more time while the countdown is running?
Yes. Use the +1 min button during the session to extend the timer without resetting it.
Can the timer repeat automatically?
Yes. Enable auto-repeat in Settings and the timer restarts itself when it reaches zero, which is useful for interval sessions and recurring reminders.
Does ClockUnit save my timer settings?
Yes, but only locally in your browser. Your settings and completed timer count are stored on-device and are not sent to a server.