Date & Time
Countdown Timer & Stopwatch
Run an accurate browser countdown or stopwatch with laps.
Your inputs
Adjust the values
The display uses elapsed wall-clock time to avoid interval drift. Keep the page open while timing.
Time remaining
00:05:00.00
About this tool
A straightforward countdown timer & stopwatch
Run an accurate browser countdown or stopwatch with laps. Elapsed wall-clock timestamps update the display, avoiding the drift caused by simply counting interval callbacks.
Browser throttling can delay visual updates, but the next update recalculates from wall-clock elapsed time. Inputs are processed in your browser, and changing a value updates the result immediately.
How it works
Use the Countdown Timer & Stopwatch in three steps
- 1Enter your values
Choose countdown or stopwatch, set a countdown duration when needed, and use the start controls.
- 2Check the setup
Choose the units or calculation mode that matches your situation.
- 3Use the result
Track hundredths of a second and record up to 20 recent stopwatch laps.
Common questions
Countdown Timer & Stopwatch FAQ
How does the Countdown Timer & Stopwatch work?
Elapsed wall-clock timestamps update the display, avoiding the drift caused by simply counting interval callbacks.
What information do I need?
Choose countdown or stopwatch, set a countdown duration when needed, and use the start controls.
How accurate is the result?
Browser throttling can delay visual updates, but the next update recalculates from wall-clock elapsed time.