All timers

20 Minute Timer

Press start and this 20 minute timer counts down 1,200 seconds to zero — full screen if you want it, with a gentle chime or a silent green flash when time is up. The 20 minute timer is one of the most-used timers on the web: roughly 246,000 US searches a month (Semrush, 2026). This page is free, with no ads and no sign-up, works offline once loaded, remembers your volume on this device, and shows the exact clock time it will finish — so one glance tells you where you stand. It is built for power naps, recipe steps, and presentation rehearsals.

20:00 of 20:00
20:00 of 20:00

Done at —

We keep the tab title updated too, so you can watch it from another tab.

Time's up. Done.
30%

Sound level is remembered on this device. Muted? Time-up flashes the screen instead.

Full screen

One click. Nothing but the timer.

Silent option

Screen flashes fern green when time is up.

Completion time

You always see exactly when it ends.

Frequently asked questions

Why do people set a 20 minute timer for naps?

A 20 minute nap hits the sweet spot sleep researchers describe: long enough to relieve sleep pressure and restore alertness, short enough to avoid waking from deep sleep, which causes grogginess. Set the timer, mute the chime so you get the silent flash, and keep the volume decision remembered on your device.

How do I make the 20 minute full screen?

Press Start, then click the Fullscreen button (or press F). The whole window becomes nothing but the timer: digits big enough to read from across a classroom or office. Press Esc to leave full screen; the timer keeps running either way.

Does the 20 minute make a sound when time is up?

Only if you want it to. The default chime is a soft, synthesized two-note tone, not a harsh buzzer. Drag the volume slider to set the level, or mute it entirely: when muted, the screen flashes fern green instead, so a silent room stays silent. Your setting is remembered on this device.

Can I use the 20 minute offline?

Yes. The page is a single self-contained file with no external requests beyond Cloudflare’s privacy-respecting, cookie-less page-view counting, and it installs as a PWA: after your first visit, the timer keeps working with no network at all. That makes it reliable on school networks, planes, and dead zones.

How many seconds is 20 minutes?

20 minutes is exactly 1,200 seconds. If you need a different length, the All timers page links every preset from 1 to 90 minutes and 1 hour, and each page switches between a shrinking-disc view and plain digits.

Related timers

Adjacent lengths and the tools people pair with this one.

15 Minute Timer

A quarter hour instead.

30 Minute Timer

Stretch it — take thirty.

Classroom Timer

Silent default, board-readable digits.

All timers

Every length, from 1 to 90 minutes.