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20 Minute Timer
Your 20:00 countdown is ready: press Start (or Space) and the alarm sounds after twenty minutes. Ideal for naps, study blocks, workouts, meditation and baking.
20:00
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?m=15 to the address for a custom length. Keep this tab open; the countdown stays accurate in the background.
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How to use the 20 Minute Timer
- Press Start or hit the Space bar. The 20:00 countdown begins immediately.
- Want a reminder midway? Tick Soft chime at the halfway mark to hear a gentle chime at 10:00 left.
- Fine-tune the length with the ± buttons or pick another preset.
- Choose an alarm sound and volume, then press Play test sound to check you can hear it.
- When time is up, press Stop alarm or Space. Press R to reset to 20:00.
How long is 20 minute?
| Measure | 20 Minute equals |
|---|---|
| Minutes | 20 min |
| Seconds | 1,200 s |
| Milliseconds | 1,200,000 ms |
| Hours | 0.3333 h |
| Share of a day | 1.39% (1/72 of a day) |
| Walking at 5 km/h (3.1 mph) | about 1.7 km (1 mi) |
| Speaking at 130 words per minute | about 2,600 words |
| Reading at 230 words per minute | about 4,600 words |
What you can do in 20 minute
| Activity | Why 20 minute works |
|---|---|
| Nap | The classic 20 minute power nap |
| 20-20-20 rule | Every 20 minutes of screen time, look at something 20 feet away for 20 seconds |
| Study block | A focused session followed by a short break |
| Workout | A full HIIT or core session |
| Baking | Many cookies, muffins and roast vegetables take 15 to 25 minutes |
| Meditation | A common length for a longer seated practice |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 1,200,000 ms on the browser's monotonic clock (performance.now()). Every screen update subtracts the current time from that end moment instead of counting ticks, so a throttled background tab or a busy computer cannot make it fall behind. Pausing stores the time left, and Resume sets a new end moment that far in the future.
Frequently asked questions
How do I set a 20 minute timer?
It is already set to 20:00. Press Start or the Space bar; the alarm rings at 0:00 until you press Stop alarm.
How many seconds are in 20 minutes?
20 minutes is 1,200 seconds or 1,200,000 milliseconds, one third of an hour (about 0.333 hours).
What is the 20-20-20 rule?
It is an eye-strain tip: every 20 minutes of looking at a screen, look at something about 20 feet (6 metres) away for 20 seconds. Restart this timer after each break.
Can I hear a reminder at the halfway point?
Yes. Tick "Soft chime at the halfway mark" and a quiet chime plays once when 10 minutes are left.
Will it keep running if my screen locks?
The timer stays accurate while the tab is open, but some phones pause web pages when locked. Keep the screen on, or use notifications on a computer.
Can I add or remove time?
Use +1 min and −1 min at any time, or pick a preset. During the alarm, +1 min acts as a one-minute snooze.
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