Free online interval timer for HIIT, Tabata, running and circuit training. Customize work/rest durations and rounds. Features sound alerts and visual progress indicators. Perfect for your workout routine.
💡 Tip: Sound alerts play at each phase change. Make sure your volume is on.
How to Use the Interval Timer
Set up your interval workout in three simple steps:
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Set Your Workout
Enter your work time, rest time, number of rounds, prep time, and cool-down duration. Use the presets (Tabata, HIIT, Boxing) for quick setup. -
Press Start
Click "Start Workout" and the timer counts down each phase, switching between work and rest automatically. Sound alerts play at each phase change. -
Track and Finish
Watch the round and elapsed-time counters, then use Stop or Reset at any time. The timer runs entirely in your browser — no data is uploaded to any server.
FAQ
Is this tool free to use?
Yes, this tool is completely free to use. No registration, subscription, or payment is required. All processing happens directly in your browser.
Does this tool upload data to a server?
No. Everything runs locally: work time and rest time are processed on your device and never sent to a server. Your data never leaves your device, and the tool works even when offline.
Does this tool work on mobile devices?
Yes, this tool is fully responsive and works on all modern browsers including Chrome, Safari, Firefox, and Edge on desktop, tablet, and mobile devices.
Is an internet connection required to use this tool?
No internet connection is required after the page loads. Since all processing happens in your browser, you can use this tool offline once the page is loaded.
Are there any limits on rounds or timing?
There are no limits — work/rest durations and round counts are only constrained by reasonable browser values. Everything is processed locally, so performance depends on your device.