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Works on any device
Built for any workout
15 Second Interval Timer
Set up fast, repeating 15-second intervals to sharpen your training, pace your workouts, and keep every session focused.
How to Use a 15 Second Repeating Timer for Training
Our 15 second interval workout timer makes it easy to structure short bursts of work or recovery without having to watch the clock. Whether you are running sprint intervals, bodyweight drills, agility work, or fast-paced strength sets, a repeating 15 sec timer helps you stay on pace and fully focused.
This timer is ideal for fitness challenges, combat sports rounds, athletic speed training, or managing quick rest periods between heavy lifts. You can set your timer to repeat every 15 seconds automatically, so you can train or coach without constantly resetting or guessing the time.
Our free online 15 second timer works on any device, lets you switch to fullscreen for better visibility, and gives you clear audio signals so you know exactly when to move. There are no downloads, no logins, and no unnecessary steps, just open the timer, set it up, and get to work.