Stopwatch - Free Online | FunToolX
Use Stopwatch online for free, no download required. FunToolX offers hundreds of fun online tools.
About this tool
Stopwatch is a free online utility tool. Online stopwatch with laps and pause. An everyday helper that saves you time. It runs entirely in your browser — no download or sign-up needed.
Click the Start button to start the stopwatch, and the number beats in real time display hours, minutes, seconds, and milliseconds. Click the Count button to record the current lap speed. The stopwatch continues to run but the duration of each lap will be displayed. Support pause, continue, and reset operations. Lap speed data is displayed in list form, allowing you to compare the fastest and slowest laps.
The stopwatch is implemented based on performance.now (), which is a high-precision timestamp API provided by the browser with an accuracy of up to microsecond. Compared with Date.now (), it is not affected by system time adjustments and is more suitable for accurate timing. Display refreshes use requestAnimationFrame to keep them flowing.
It is suitable for timing sports such as running and swimming, recording reaction time in the laboratory, or any scene that requires accurate timing. The count function is particularly suitable for lap speed analysis in track and field training.
Online stopwatch timer supports positive timing, Split, and lap speed recording with an accuracy of milliseconds. It is suitable for exercise timing and experimental recording.