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Free HIIT & Tabata Workout Timer Online
Free HIIT & Tabata Workout Timer is a free online tool by US AI. Set work/rest intervals and rounds, follow the animated exercise cards, and train with countdown beeps — right in your browser.
💪 Jumping Jacks
Rough calorie estimate appears when you finish.
📖 How to use
- Pick a preset (Tabata 20/10 ×8, HIIT 40/20 ×10) or set your own work/rest/rounds.
- Press Start and follow the big timer, progress ring and exercise card.
- A rough calorie estimate appears when you finish — estimates only, not medical advice.
✨ Why use this tool?
US AI's free HIIT timer runs entirely on your device with zero downloads. Perfect for home workouts, gym intervals and Tabata sessions.