Stopwatch
9 toolsA stopwatch with lap timing.
Runs in your browser — your files and text stay on your device
A complete date and time toolkit — convert Unix timestamps, calculate exact age or the difference between two dates, check the world clock across timezones, run a countdown or stopwatch, add business days, or look up a week number. Everything runs locally in your browser.
Timestamp ConverterAge CalculatorDate DifferenceTimezone ConverterWorld ClockCountdown TimerStopwatchBusiness Days CalculatorWeek Number Lookup
00:00.00
How to use this tool
- 1Click Start to begin timing.
- 2Click Lap to record a split without stopping.
- 3Pause and Resume as needed, or Reset to clear everything.
Frequently asked questions
How precise is this stopwatch?
It updates every 10 milliseconds, precise enough for most everyday timing needs.
Does it keep running if I close the tab?
No — timing state lives only in the page and resets on reload.