Stopwatch

What Is a Stopwatch?

A stopwatch is a timekeeping device used to measure elapsed time from a specific starting point. Unlike a clock that shows the current time of day, a stopwatch counts upward from zero, allowing you to precisely measure the duration of an activity. This online stopwatch provides centisecond (1/100th of a second) precision and includes lap timing, making it suitable for a wide range of timing needs without requiring a physical device.

How to Use

Click Start to begin the stopwatch. Use Lap to record split times without stopping. Click Stop to pause, and Reset to clear everything. You can resume timing after stopping by clicking Start again.

Common Use Cases

• Sports and fitness — time runs, laps, intervals, and workout sets
• Cooking — track boiling, steeping, or baking durations
• Productivity — measure how long tasks take using time-boxing techniques
• Education — time exams, presentations, or science experiments
• Games — set time challenges or measure reaction times

Features

• Centisecond precision (1/100th of a second)
• Lap time recording with split display
• Pause and resume without losing elapsed time
• Clean, distraction-free interface
• Works entirely in the browser — no installation required

Privacy

All processing happens in your browser. No data is sent to any server.