Interval Timer

A big, loud interval timer for Tabata, HIIT and circuit training – green for work, blue for rest.

Ready

0:20

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Quick presets

Space starts and pauses, arrow keys skip. The screen stays on while the timer runs, where your browser allows it. Settings stay in this browser.

Train in intervals without watching the clock

Interval training alternates short bursts of work with rest – the best-known form is Tabata: 20 seconds all-out, 10 seconds rest, 8 rounds, four minutes in total. This interval timer counts it for you: the whole screen turns green for work and blue for rest, beeps count down the last three seconds, and the round counter shows how far you are.

Pick a preset (Tabata 20/10, 30/30, 40/20, 45/15 or EMOM) or set your own work, rest, rounds, get-ready and cool-down times. Add exercise names and the timer shows which one comes next – perfect for circuit training at home, in the gym or in a PE lesson. Skip or go back an interval at any time.

How to use

  1. Choose a preset or set work, rest and rounds.
  2. Optionally list your exercises, one per line.
  3. Press Start (or Space).
  4. Follow the colours and beeps – ⏮ ⏭ jump between intervals.

Ideas for using it

  • Tabata. 20 s work / 10 s rest × 8 = 4 minutes.
  • HIIT at home. 40/20 × 8 with four exercises in rotation.
  • PE lesson. circuit stations: 45 s work, 15 s to change station.
  • Running intervals. 60 s fast, 60 s easy jogging × 10.

Frequently asked questions

What is Tabata?

A form of high-intensity interval training: 8 rounds of 20 seconds maximum effort and 10 seconds rest. It is short but tough – warm up first.

Does the screen stay on?

In most modern browsers, yes: the timer asks the device to keep the screen awake while it runs.

Does it work in the background?

The countdown is based on the clock, so it stays correct. Beeps may be muted by your phone when the browser is in the background.

Need exercises?

Try the random workout generator, or use the stopwatch for timing runs.