Free to use, no account
Interval Timer
Build a simple work-and-rest interval session for HIIT, Tabata-style workouts or custom circuits. Choose the interval lengths, rounds and a preparation countdown, then start the timer.
How do I use this interval timer?
Choose a preset or enter whole seconds for work, rest, rounds and optional preparation. Press Start to begin. Pause and resume preserve the current interval; Reset ends the session. The final round has no extra rest.
Frequently asked questions
How do I use this interval timer?
Choose a preset or enter whole seconds for work, rest, rounds and optional preparation. Press Start to begin. Pause and resume preserve the current interval; Reset ends the session. The final round has no extra rest.
Does the interval timer upload my workout settings?
No. The timer runs in this browser and does not upload, store or send your settings to a server.
How long is a Tabata timer session?
The common Tabata pattern is 20 seconds of work and 10 seconds of rest for 8 rounds: 4 minutes total, without an added rest after the final work interval.
Will the timer keep sounding if I switch tabs or lock my phone?
Not reliably. Browsers can throttle background pages, and a sleeping device can delay both the timer and audio. Keep the page open and the device awake when precise cues matter.
Can I turn off the interval timer sound?
Yes. Uncheck Sound cues before starting. The timer and visual phase changes continue without audio.