Free 15 Minute Timer — 900 Second Countdown

Fifteen minutes is the ideal power nap duration — long enough to refresh without entering deep sleep. Start this 15 minute countdown and the alarm wakes you at exactly the right moment.

Best Uses for a 15 Minute Timer

A 15-minute power nap is one of the most well-researched performance interventions available. Studies show it improves alertness, cognitive function, and mood without the grogginess that comes from sleeping longer than 20 minutes. Set this timer, close your eyes, and let the alarm handle the waking.

In classrooms, 15 minutes is the recommended duration for silent sustained reading (SSR) periods. It is long enough for students to engage with a text but short enough to maintain focus without restlessness. Teachers project the fullscreen countdown on the interactive whiteboard so every student can see the time remaining.

For exercise, 15 minutes covers a complete warm-up before intense training: 5 minutes of light cardio, 5 minutes of dynamic stretching, and 5 minutes of activation exercises. A 15-minute HIIT session using the Interval Timer with 30/30 work-rest ratio produces 15 rounds of effective conditioning.

Features

Progress bar, 15 alarm sounds, tab title countdown, fullscreen mode, repeat toggle. For the Pomodoro long break (which defaults to 15 minutes), use the Pomodoro Timer which handles the entire focus-break cycle automatically.

Other durations: 10 minute timer, 20 minute timer, 25 minute timer.