Chronometer
Simple stopwatch and timer tool
00:00.00
Start
Lap
Reset
TL;DR
What is Chronometer?
A chronometer is a precise timekeeping instrument. In this context it is a browser-based stopwatch: start, stop, and reset to measure elapsed time with millisecond precision. Lap times let you record intermediate splits without stopping the overall timer.
Common use cases
- ‣Performance benchmarking: measure how long a manual process takes to establish a baseline
- ‣Presentations and demos: time a live walkthrough to stay within a session slot
- ‣Focus sessions: track time spent on a task using the Pomodoro or time-boxing technique
Frequently asked questions
How accurate is a browser-based stopwatch?
Browser timers use performance.now() which has sub-millisecond resolution in most browsers. However, browsers throttle timers in background tabs (Firefox and Chrome reduce resolution to 1ms or more). Keep the tab focused for the most accurate measurements.