EventTimerEventTimer.io

Free Interval Timer for Workouts and Productivity

Set work and rest intervals, hit start, and let the timer auto-cycle through your rounds. Built for HIIT, Tabata, circuit training, and focused work sessions.

No signup  ·  No download  ·  Works on every device

Live Demo

00:28

This is the real timer engine

Millisecond precision·Works on all devices·Fullscreen display·Instant start

Interval Timer for HIIT and Tabata Workouts

Interval training depends on precise timing. A Tabata protocol is exactly 20 seconds of work followed by 10 seconds of rest, repeated 8 times. HIIT sessions might use 30 seconds on, 15 seconds off, for 10 to 20 rounds. Getting these intervals wrong means a less effective workout. EventTimer lets you set custom work and rest durations, choose how many rounds you want, and the timer auto-advances through the entire sequence. Color-coded warnings tell you when a transition is coming so you can prepare for the next burst. Display it fullscreen on a gym TV and the whole class stays in sync.

  • Custom work and rest durations
  • Automatic round progression
  • Color-coded transition warnings
  • Fullscreen display for group visibility
00:30
0-minute default

Circuit Training and Group Fitness

Circuit classes rotate between stations, each with a fixed work period and a transition period. A coach running a 6-station circuit with 45-second work and 15-second transitions needs a timer that handles the sequence automatically, station after station, round after round. EventTimer links timers in sequence so they run back to back with no manual intervention. Mount a tablet on the wall or connect a laptop to the gym TV, start the sequence, and focus entirely on coaching form and motivation instead of watching a clock.

  • Sequential timer linking for stations
  • Hands-free auto-advance
  • Large display for gym environments
  • Works on smart TVs, tablets, and phones
00:30
0-minute default

Interval Timer for Productivity and Studying

The same work-rest principle that powers physical training also powers mental performance. The Pomodoro Technique is a 25-minute work interval followed by a 5-minute break, and research on ultradian rhythms suggests that 90-minute deep-work blocks followed by 20-minute breaks can boost sustained focus. EventTimer handles any interval pattern you choose. Set your work duration, set your break duration, choose the number of cycles, and the timer takes care of the rest. When the work interval ends, the alert tells you to step away. When the break ends, it tells you to get back to it.

  • Customizable work and break durations
  • Multiple cycles with auto-advance
  • Sound alerts for transitions
  • Works for Pomodoro, 90-min blocks, or custom intervals
00:30
0-minute default

Get started

Three steps, no signup

1

Open the timer

Visit eventtimer.io. The timer loads instantly in your browser, on any device.

2

Set your duration

Type any duration or choose a preset. Switch between countdown, count-up, or clock mode.

3

Go fullscreen and start

Press F for fullscreen, Space to start. Share the link if your team needs to see it.

Common questions

Can I set different durations for work and rest intervals?

Yes. Set any duration for the work period and any duration for the rest period. Common setups include 30/10, 20/10 (Tabata), 45/15, and 25 min/5 min (Pomodoro).

Does the timer auto-advance through rounds?

Yes. Once you set the number of rounds, the timer cycles through work and rest periods automatically. You do not need to touch anything until the full sequence is complete.

Can I display the interval timer on a gym TV?

Yes. Open EventTimer on the device connected to your TV, set up the intervals, and press fullscreen. The large digits and color-coded warnings are visible from across the room.

Can I use it for Pomodoro study sessions?

Absolutely. Set a 25-minute work interval and a 5-minute break. After 4 cycles, take a longer 15 to 30-minute break. The timer handles the transitions automatically.

Is there a sound when intervals change?

Yes. An audio alert plays at each transition so you know when to start or stop, even if you are not looking at the screen.

Does it work on my phone during a workout?

Yes. EventTimer is fully responsive and works on mobile browsers. Prop your phone up where you can see it, or connect to a Bluetooth speaker for louder alerts.

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