Measurement
Chronometer
Measure elapsed time, pause and resume a session, and record cumulative checkpoints while a page remains open.
About this tool
When to use it
Measure elapsed time, pause and resume a session, and record cumulative checkpoints while a page remains open.
How to use it
Select Start, record a Lap at each checkpoint, and Pause when the task stops. Resume adds to the accumulated time. Reset clears both elapsed time and the lap list.
Guide updated . Examples checked against this implementation.
Worked examples
A reset timer
Input
Start, pause, then ResetExpected output
00:00:00.00Reset removes accumulated time and checkpoints. Lap entries are cumulative elapsed times, not the interval since the preceding lap.
Errors and unsupported input
The display refreshes slowly in a background tabBring the tab to the foreground. The browser may throttle repaint or timer callbacks; this display is not a precision measurement instrument.
Continue this workflow
- Benchmark Builder: Turn a measured duration and operation count into throughput.
Questions
Frequently asked questions
Does Pause include time spent paused?
No. Resume begins another active interval added to the accumulated elapsed duration.