20 Minute Timer
Counts down 20 minutes in your browser and sounds an alarm when it finishes. No sign-up, no ads.
00:20:00
20 minutes
- A nap short enough to avoid grogginess
- Baking or roasting
- A focused reading block
This is a ready-to-go 20 minute timer: press start and it counts down from 00:20:00, then plays an alarm. Nothing is sent anywhere — the countdown and the alarm both run in your browser, so it keeps working with no connection.
What people set 20 minutes for: a nap short enough to avoid grogginess, baking or roasting, a focused reading block. Twenty minutes is the usual advice for a nap: long enough to restore alertness, short enough to wake before deep sleep begins.
Need a different length, laps, or a sequence of intervals back to back? The full stopwatch and timer takes any duration, records lap times, and runs multi-step interval workouts.
How long is a 20 minute timer?
20 minutes — that is 1,200 seconds, or 33.3% of an hour. The countdown on this page starts at 00:20:00 and runs to zero.
What is a 20 minute timer used for?
Most often: a nap short enough to avoid grogginess, baking or roasting, a focused reading block. Twenty minutes is the usual advice for a nap: long enough to restore alertness, short enough to wake before deep sleep begins.
Does the 20 minute timer keep running if I switch tabs?
The elapsed time is measured against the clock rather than counted frame by frame, so the total is unaffected by a background tab — it catches up the moment the tab is visible again. Browsers do throttle background tabs, though, so the alarm can be late if the timer finishes while the tab is hidden. Closing the tab stops it entirely; for anything longer than an hour a phone alarm is more reliable.
Does it work offline?
Yes. The page is cached the first time you visit, and the timer and its alarm are entirely local — nothing is sent to a server and there is no account to create.