20 Minutes Timer
A free, full-screen 20 Minutes countdown with an alarm. Press Start and it counts down from 20 Minutes; when it reaches zero, the alarm sounds.
20:00
How it works
Twenty minutes anchors the 20-20-20 rule for eye strain (every 20 minutes, look at something 20 feet away for 20 seconds), a power nap, and a full 20-minute HIIT session. Twenty minutes as a nap length is specifically chosen to stay in light sleep — long enough to feel a benefit, short enough to avoid waking up groggy from deep sleep.
If you're using this timer for the 20-20-20 rule, keep it running continuously through a work session rather than resetting it manually each time; let the alarm be your cue to glance away from the screen, then restart it right after.
Common uses
- Following the 20-20-20 rule to reduce digital eye strain during screen work.
- Taking a 20-minute power nap without sliding into deep sleep.
- Running a complete 20-minute HIIT session including work and rest intervals.
Frequently asked questions
- Does the 20 Minutes timer keep running if I switch tabs?
- Yes. The 20 Minutes countdown is based on the real clock, so it stays accurate in the background and the alarm still rings when time is up.
- Will it make a sound when the time is up?
- Yes — a short alarm beep plays when the countdown reaches zero. Make sure your device isn't muted.
- What is the 20-20-20 rule?
- Every 20 minutes of screen work, look at something at least 20 feet away for 20 seconds. It's a commonly recommended habit for reducing digital eye strain from prolonged close-up screen focus, not a cure for underlying vision problems.
- Is a 20-minute nap better than a 30-minute nap?
- For avoiding grogginess, generally yes — 20 minutes tends to stay in lighter sleep stages, while 30 minutes is more likely to tip into deep sleep, which causes sleep inertia (grogginess) if you wake up in the middle of it. Naps closer to 90 minutes let you complete a full sleep cycle and avoid that same grogginess.