TimerHub
TimerHub

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100 Second Timer

One hundred seconds — 1 minute 40 — for a plank challenge, a short pitch, or counting to 100 in hide-and-seek.

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How to use the 100 second timer

  1. Press StartThe 100 second countdown begins at once. The Space bar starts and pauses it too; R resets it.
  2. Adjust as you goUse − and + to change it by 10 seconds, or click the digits and type any time, like 12:30, 1h30 or until 5:30pm.
  3. Hear the alarmA loud bell and beep rings at zero until you press Stop, with a vibration on phones. Pick a chime, a shorter ring or a silent glow under More.
  4. Make it yoursPick a scene and sound, press Fullscreen for a room-sized Clear view (Esc to exit), turn on notifications for a background tab, or add ?autostart=1 to the link to start on load.

Shortcuts

SpaceStart / pauseRReset+Add time (− removes it)FFullscreen

Single-key shortcuts can be switched off under More.

100 second timer at a glance

AccuracyCounts to an absolute finish time, so it stays exact in a background tab and after the device sleeps. How the timing is tested
AlarmLoud bell & beep that rings until you press Stop, with the whole screen flooding sunrise-warm. Chime, bell, beep, a shorter ring or a silent glow under More.
DisplayLarge digits that never jitter, a progress horizon, and a fullscreen Clear view (or Daylight, for bright rooms) readable across a room.
SoundOptional rain, ocean, fireplace, café, night, brown or white noise and a focus pad — made in your browser, faded out at zero.
MemoryA running or paused countdown survives a reload or a browser restart, saved on this device only.
PriceFree. No ads, no signup, nothing to install — and it works offline once visited.

100 seconds at a glance

In minutes1 minute 40 seconds, or about 1.67 minutes
Counting to 100About 100 seconds at one number a second: the hide-and-seek count
As a plankA strong hold, and a stretch goal for many beginners
SpeakingAbout 220–270 words at a relaxed 130–160 words a minute
Green teaInside the usual 1–3 minutes, at the lighter end

Other ways to time 100 seconds

The same countdown as a picture, a soundscape, a projector view or a video.

Sand timerVisual timer · set it to 100 secondsCandle timerVisual timer · set it to 100 secondsRocket timerVisual timer · set it to 100 secondsTimer with musicRain, sea or fire under the countdownClassroom timerProjector view · gentle chimeTimer video (MP4)For Slides, Canva & Keynote

About the 100 second timer

100 seconds is 1 minute and 40 seconds: long enough to feel, short enough to finish. It's how long it takes to count to 100 at a number a second, a stiff plank for most people, and a tight limit for a lightning pitch or a quick explainer. Press Start and the digits count down from 1:40, with the clock time it will finish shown underneath.

A 100 second timer (1 minute 40 seconds) for plank challenges, 100-second pitches and hide-and-seek counts. Shows its finish time; alarm at zero.

TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.

1:40 timer1 minute 40 second timer100 sec timer100s timer

100 second timer FAQ

How long is 100 seconds?
1 minute and 40 seconds, or about 1.67 minutes. The timer starts at 1:40 and counts down to zero, with the clock time it will end shown before you start.
How many words can I say in 100 seconds?
At a relaxed speaking pace of 130 to 160 words a minute, about 220 to 270 words. Read your script aloud against the timer once or twice and trim until you finish with a few seconds to spare.
Is a 100 second plank good?
For most people, yes: it's a solid hold. If you can't reach it yet, build up in steps — hold for as long as your form stays good, rest, and go again. The 60 second and 90 second timers make good stepping stones.
Can I use it for hide-and-seek?
Yes. Counting to 100 at a number a second takes about 100 seconds, so press Start instead of counting and let the alarm tell everyone the search has begun. Fullscreen shows the hiders how long they have left from across the room.
Will it keep counting if I switch apps?
Yes. It runs to an absolute end time, so it stays exact in a background tab and the alarm sounds at zero. Turn on notifications under More for an alert while you're in another tab.

Build repeating work and rest rounds in the Interval Timer →

Take this timer with you

Keep it beside your notes in Notion, embed it on a class page or website, put it on stream, or drop an MP4 into your slides. Free, no account, no ads.

Use this timer in your workspace →