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Stopwatch for HIIT and Interval Workouts

Time your high-intensity intervals, rest periods, and circuit workouts with precision and lap recording.

No login required
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Ready

Keyboard: Space start/stop Β· L lap Β· R reset

Fitness tips

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For Tabata workouts (20s work / 10s rest Γ— 8 rounds), use the lap button after each work or rest phase to track interval consistency.

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The fastest/slowest lap highlighting shows whether your intensity is dropping over rounds β€” useful for tracking endurance improvement over weeks.

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Use the keyboard shortcut Space to start/stop without taking your hand off the mat. Great for floor exercises where you can't easily touch your phone.

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Copy your laps after a workout to log to a fitness journal or spreadsheet. The tab-separated format pastes cleanly into Google Sheets or Excel.

How It Works

1
Enter
Enter your data into the tool above. Everything stays local to your browser.
2
Process
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Download
Get your result instantly. Nothing is stored after you leave the page β€” complete privacy.

Why use ours?

βœ“Completely free β€” no hidden costs, ever
βœ“No account, email, or login required
βœ“Files never leave your device
βœ“No file size limits whatsoever
βœ“No watermarks on any output

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Frequently Asked Questions