21 seconds timer
Set a timer for 21 seconds. Rings when it's done.
00:21
A countdown timer for 21 seconds. Press the "Start" button to start the timer. The timer will alert you when it expires. You can reset the timer at any time using the "Reset" button. You can also pause the timer at any time using the "Pause" button.
Custom timer
Hours
Minutes
Seconds
Things you can do in 21 seconds
- Read 0.175 pages of a book
- Walk 0.0175 miles
- Read 1 email
- Watch 1 TikTok
- Blink 42 times
- Click this 131 times
In 21 seconds...
- Your heart beats 21 times
- Light travels 3,906,002 miles
- Earth travels 399 miles around the Sun
- The International Space Station travels 99 miles
- Elon Musk earns $105,000
- 1,323,001 Google searches get made
- The U.S. national debt increases by $955
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Frequently asked questions
Why do I need a timer?
If you're here, you probably already need it for something. In any case, timers are useful any time you need to perform a certain action for a specific amount of time. The timer alerts you when that time period is over.
How do I know when the timer is up?
When the timer is up, we'll play a 2 second alert and the timer will blink red. We'll also update the timer in the page title, so you will instantly see it even if you have multiple browser tabs open.
Can I use it on my phone?
Yes, it works on any device with a browser.
How can I support you?
Bookmark timer.guru and share it on social media.