Math
Stopwatch / Timer
Two tools in one page: stopwatch with laps and countdown timer with alert.
Space Start / Stop
L Lap
Esc Reset
Laps
Lap
What does Stopwatch / Timer?
A stopwatch and countdown timer tool — precise time measurement with lap support, running entirely in your browser.
How to use Stopwatch / Timer?
- Click Start to begin the stopwatch, Stop to pause, and Reset to clear.
- Click Lap to record a split time while the stopwatch is running.
- Switch to the countdown timer, set a duration, and start.
Key features
- Stopwatch with millisecond precision
- Lap / split time recording
- Built-in countdown timer
Frequently asked questions
How accurate is the stopwatch?
The tool displays millisecond precision — accurate enough for everyday use, sports, and general timing.
Does the time reset on page reload?
Yes. The stopwatch is session-based and resets when the page reloads.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.