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Online Stopwatch
時間A precise lap stopwatch with millisecond accuracy.
ttb run online-stopwatch
Precision Stopwatch
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Online Stopwatch の使い方
Click "Start" to begin timing. The stopwatch displays elapsed time down to millisecond precision. Click "Lap" to record split times without stopping the timer. Click "Stop" to pause, and "Reset" to clear. Export your lap times for training analysis or time studies.
1
Enter your parameters
Configure the inputs for the Online Stopwatch according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
よくある質問
How accurate is the browser stopwatch?+
Modern browser timers (using performance.now()) provide sub-millisecond precision. However, due to browser security measures against timing attacks, precision is typically limited to 5 microseconds - more than sufficient for any practical timing need.
Does it keep running if I switch tabs?+
Yes. The timer uses absolute timestamps rather than intervals, so switching tabs or minimizing the browser doesn't affect accuracy. The displayed time is always correct when you return.