Run a wall-clock stopwatch with pause, resume, reset, and up to fifty lap and split records.
Ready to use · Runs in your browser · No signup
Loading tool…
How to use the Stopwatch
Start a simple elapsed-time stopwatch, record each lap interval with its cumulative split, pause and resume, and reset the session without creating an account.
Measure elapsed time with start, pause, reset, and lap controls. It works well for study drills, informal exercise, presentations, and repeated tasks where relative timing is enough.
The timer runs in the browser and does not create an account or cloud history. Keep the page open because Fieldlet timers use visual completion states and do not play alarms or send system notifications.
Start the stopwatch; Fieldlet records the wall-clock start time instead of assuming every timer tick arrives on schedule.
Record a lap to preserve both the interval since the previous mark and the cumulative split since start.
Pause, resume, or reset the session as needed.
Last reviewed for accuracy:
Worked examples
Record practice laps
Scenario: A user starts the stopwatch, records three lap marks, pauses after the final lap, and compares the intervals.
Result: Each row shows the lap interval and its cumulative split since the stopwatch started.
The lap value is the current split minus the previous split, while the split preserves total elapsed time at that checkpoint.
How the result is produced
Elapsed time is calculated from high-resolution browser timing or timestamp differences, with paused duration excluded. Display updates are visual samples and do not redefine the underlying elapsed interval.
Lap values measure the interval since the previous mark
Split values preserve total elapsed time at each mark
Pause excludes the paused interval after timing resumes
Reset clears the active measurement and lap history
Limitations and common mistakes
Browser timing is not certified for competitive, laboratory, legal, or industrial measurement.
Suspension, system clock changes, or closing the page can interrupt a session.
Common questions
Will background-tab throttling make the stopwatch lose time?
The display updates on an interval, but elapsed time is calculated from wall-clock timestamps, so delayed browser ticks do not accumulate as missing seconds.
What is the difference between a lap and a split?
A split is the total time since start at a checkpoint; a lap is the interval since the previous checkpoint. Fieldlet displays both in every recorded row.