Stopwatch - Free Online | ToolXHub
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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 timer, and the number will display hours, minutes, seconds and milliseconds in real time. Click the "Count" button to record the current lap speed. The timer continues to run, but displays the duration of each lap. Support pause, resume and reset operations. Lap speed data is displayed in a list format, allowing you to compare the fastest and slowest lap speeds.
The timer is implemented based on performance.now (), a high-precision timestamp API provided by the browser that is accurate as microseconds. Compared with Date.now (), it is not affected by system time adjustments and is more suitable for accurate timing. Display refreshes use the request AnimationFrame to keep flowing.
It is suitable for timing sports such as running and swimming, recording reaction times in the laboratory, or any scenario where accurate timing is required. The counting function is particularly suitable for lap speed analysis in track and field training.
The online timer supports positive timing, Split and lap time recording with an accuracy of milliseconds. Suitable for exercise timing and experimental recording.