onlinestopwatch.

Build your rhythm

Saved on this device
Interval timer configuration

Phases advance automatically. Reset to edit a session.

Interval timer

FREE
ROUND 1
Ready when you are

Work

00:00:30

Your time, at your pace.

Keep this page open. Sound may be delayed or blocked when your device sleeps or the browser suspends this tab.

Your session at a glance

    Reset this session?

    This clears your timer’s progress and returns to the beginning of the routine.

    Save this routine

    Give this setup a short name. It stays only in this browser.

    INTERVAL TIMER

    A little effort. A little recovery.

    Build a custom interval timer with work, rest, and repeated rounds for practice, exercise, or daily routines.

    Your routine. One round at a time.

    Set work and rest durations in seconds, choose your number of rounds, and apply the routine. Work and rest alternate automatically, with no rest period after the final round. Set rest to zero for continuous work rounds. Pause or reset whenever you need to.

    Your setup, saved

    Your routine and progress stay in this browser. After a refresh, choose Restore timer. Time away is included for a previously running timer; it then pauses for review.

    Sound that respects your space

    Use Test sound to check your volume before starting, or turn alerts off for a silent session. Sounds require browser support and may not play in a suspended tab.

    A clock you can trust

    Countdowns use a deadline, so delayed screen updates do not extend a phase. Changing your device clock can affect time remaining. Keep your browser active for important alerts.