20 Minute Timer
This free 20 minute timer is ready to go — the countdown is already set to 20 minutes. Just press Start and watch it tick down. When it reaches zero a built-in alarm sound plays. No download, no signup; works on desktop and mobile.
What is this timer good for?
- A focused study or work sprint before a break
- A power nap (short enough to avoid grogginess)
- A home-workout circuit with timed sets
- Oven or air-fryer cooking steps
- A guided meditation or yoga sequence
How to use it
- The timer opens preset to 20 minutes.
- Adjust the hours, minutes or seconds for a different length.
- Press Start and the big display counts down.
- An alarm sounds at 00:00:00 — press Reset to run it again.
How long is 20 minutes?
20 minutes works out to 1,200 seconds, or exactly 1/3 of an hour. That is roughly 1.4% of a 24-hour day. Half of 20 minutes is 10 minutes, and two rounds back to back add up to 40 minutes.
Twenty minutes is the sweet spot for a power nap — long enough to rest, short enough to avoid grogginess.
Things that take about 20 minutes
- Cap a nap at 20 minutes so you wake before deep sleep leaves you groggy.
- Set a 20-minute screen-time limit for kids and let the neutral alarm end the negotiation.
- Run a 20-minute study or deep-work block, then reward yourself with a short break.
- Do a 20-minute home workout video from warm-up to cooldown.
FAQ
Will it ring if I switch tabs?
Yes. The timer calibrates against your system clock, so it stays accurate even in a background tab. Just don't close the tab.
Do I need to download anything?
No. The timer runs entirely in your browser with no download, signup or plugin.
Can I change the duration?
Yes. Type any hours, minutes and seconds into the fields, or pick a related timer above.
Is it free?
Yes, it is completely free to use.
How many seconds are in 20 minutes?
20 minutes equals exactly 1,200 seconds (20 × 60).
What fraction of an hour is 20 minutes?
20 minutes is exactly 1/3 of an hour. You would need 3 rounds of it to fill a full hour.
Can I restart the 20-minute countdown when it finishes?
Yes. When the alarm sounds, press Reset and then Start to run the full 20 minutes again — handy for repeated rounds.