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10 Second Timer
A ten-second countdown, ready the moment the page loads: press Start (or Space) and watch the tenths tick down to zero, with 3-2-1 beeps before the alarm. Great for games, quick challenges and reaction drills.
0:10
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?s=40 to the address to open a custom number of seconds.
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How to use the 10 Second Timer
- Press Start or hit the Space bar. The 0:10 countdown begins immediately.
- Leave the 3-2-1 beeps on to hear when the last seconds are ticking away.
- 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 0:10.
How long is 10 second?
| Measure | 10 Second equals |
|---|---|
| Seconds | 10 s |
| Milliseconds | 10,000 ms |
| Hours | 0.002778 h |
| Share of a day | 0.0116% (1/8640 of a day) |
| Walking at 5 km/h (3.1 mph) | about 0.014 km (0.0086 mi) |
| Speaking at 130 words per minute | about 22 words |
| Reading at 230 words per minute | about 38 words |
What you can do in 10 second
| Activity | Why 10 second works |
|---|---|
| Party games | Ten seconds to name an animal, a city or a song title |
| Countdown starts | Launch a race, a toast or a reveal with a dramatic 10-9-8 count |
| Breath hold | A short, comfortable pause in breathing exercises |
| Quiz buzzers | Give players exactly ten seconds to answer |
| Stretch reps | Short dynamic holds between movements |
| Camera self-timer | Time to get into a group photo |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 10,000 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 10 second timer?
It is already set. Press Start or the Space bar and the countdown runs from 0:10 to zero, then the alarm rings until you stop it.
How many milliseconds are in 10 seconds?
10 seconds is 10,000 milliseconds, one sixth of a minute (about 0.167 minutes).
Why does the timer show tenths of a second?
In the final ten seconds the display switches to tenths (for example 4.3) so you can see the countdown precisely. You can turn this off in the settings.
Can I restart it quickly?
Yes. Press R to reset to 0:10 and Space to start again, so you can run round after round.
Can I change the length?
Use the +5 s and −5 s buttons, choose a preset from 5 seconds to 1 minute, or add ?s= with a number of seconds to the address, for example ?s=12.
Is it accurate?
Yes. The timer stores the exact end time and measures the time left from the clock, so it does not drift even if the browser is busy.
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