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Online interval timer

Set work time, rest time and number of rounds for workouts, studying or any repeated task, with a sound alert on every change.

Processed on your device. Nothing is sent to any server.
Work

00:30

Round 1 of 8

A generic interval timer that alternates work time and rest time over a number of rounds, useful for HIIT training, circuits, study blocks or any repeated task.

Each work or rest phase is a countdown calculated from its own start time, so the time shown is always accurate even if the tab stays in the background for a while. When a full round (work + rest) ends, it automatically moves to the next one until the configured number is reached.

Use cases

  • HIIT or circuit training with work and rest series.
  • Study techniques using short blocks with fixed breaks.
  • Any task repeated in timed rounds, such as language drills or rehearsals.

How it works

  1. 1

    Set work, rest and rounds

    Enter the work seconds, the rest seconds, and how many rounds you want to complete.

  2. 2

    Start

    Press "Start"; you'll see the current phase (work or rest) and the countdown.

  3. 3

    Let it chain the rounds

    When each phase ends an alert sounds and the next one starts automatically, until all rounds are complete.

Frequently asked questions

Is it only for exercise?

No, it's a generic tool: it works with a "work phase" and a "rest phase" without assuming any specific context, so it works equally well for training, studying or repeating any task by intervals.

What happens if I close the tab before finishing all rounds?

Progress isn't saved: reopening the tool starts you back at the initial setup, just like a physical timer that gets unplugged.

Does it sound different at the end of a phase versus the end of the whole workout?

Yes. Every phase change has a short alert, and completing the last round plays a distinct final alarm so you know it's fully done.

Related tools

← Dates & time