Online Stopwatch
Counts up from zero with hundredths of a second, records laps, and keeps going in a background tab.
Space to start · L for a lap · R to reset
How to use the stopwatch
- 1Start and pausePress Start (or the space bar). Pause keeps the time; Resume continues from the same instant.
- 2Record lapsPress Lap (or L) while running. Each row shows that lap’s time and the total; the fastest and slowest laps are highlighted.
- 3ResetPause first, then Reset (or R) clears the time and the laps.
Online Stopwatch FAQs
Does the stopwatch keep running if I switch tabs?
Yes. The elapsed time is calculated from the moment you pressed Start, not by counting ticks, so it stays exact even when the browser slows down a background tab. The tab title shows the running time.
How precise is it?
It displays hundredths of a second and uses your device clock. Reaction time in pressing the buttons (about a tenth of a second) matters more than the clock’s precision.
What is the difference between a stopwatch and a timer?
A stopwatch counts up from zero to measure how long something takes; a countdown timer counts down from a length you set and alerts you at zero. Use the timer for “30 minutes of focus” and the stopwatch for “how long did that run take”.
Can I use keyboard shortcuts?
Yes: space starts or pauses, L records a lap, R resets (when paused). Shortcuts are ignored while you are typing in a text field.
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