Chronometer
A clean stopwatch for measuring elapsed time in the browser — start, stop and reset.
Monitor the duration of a thing. Basically a chronometer with simple chronometer features.
Steps and notes
What is Chronometer?
A minimal stopwatch that runs entirely in the page: start to begin counting, stop to freeze the display, reset to return to zero. Useful as a lightweight timer for coding sprints, meeting segments, brewing instructions — anything where opening your phone is a bigger context switch than a spare tab.
- Click start to begin counting
- Click stop to freeze the elapsed time
- Click reset to return to zero
- The count is not saved: refreshing the page or navigating away resets it to zero — copy any duration you need before leaving
- While the tab is hidden the on-screen number stops repainting, but the next visible update catches up to the true elapsed time, so the total stays wall-clock accurate
Frequently asked questions
- Does it keep running if I switch tabs?
- Yes — it tracks elapsed wall-clock time rather than counting ticks, so background throttling does not make it lose seconds. Return to the tab and the correct total is shown.
- Is there a lap or split-time feature?
- No — this stopwatch has start, stop and reset only. It tracks a single running total rather than per-segment laps; use reset to zero it between intervals.
- How accurate is a browser stopwatch?
- It reads the system clock, so accuracy is that of your device — well within what human timing needs. For sub-millisecond engineering measurements, use the benchmark tool instead.
Category: Measurement
Date & time workflow
Date Converter — Formats, Time Zones and ISO 8601 → Unix Timestamp Converter — Epoch to Date, Seconds vs Milliseconds → ETA Calculator → Chronometer