Stopwatch & Timer
Track time with precision
🏁 Laps
About Stopwatch and Timer
A stopwatch for measuring elapsed time with lap splits, and a countdown timer for a fixed duration. Both run in the browser tab and keep counting while you work elsewhere on the page.
Stopwatch or countdown
A stopwatch counts up from zero and is for measuring something whose length you do not know — how long a task actually took, or lap times in training. A countdown runs from a set duration to zero and is for enforcing a length you have decided in advance — a presentation slot, a rest interval, cooking.
Does it keep running if I switch tabs?
The count continues, but browsers throttle background tabs to save battery, so updates may become less frequent and the display can jump when you return. Timing that must be exact should not rely on a background browser tab — use a device stopwatch instead.
How accurate is it?
Precise enough for cooking, exercise and presentations — within a few tens of milliseconds. It is not suitable for anything where a fraction of a second is contested, because the browser's timer resolution is deliberately coarsened as a security measure and screen refresh adds further latency.