Online Stopwatch

A stopwatch that is always ready

A stopwatch is one of those simple tools you do not think about until you need it, and then you need it immediately. This one is built to be exactly that: open the page and it is ready, with start, stop, reset and lap controls and a display accurate to a hundredth of a second. It is handy for interval workouts and timed runs, for rehearsing a presentation or a speech, for cooking and brewing, for science experiments and classroom activities, and for any small contest where a fair, precise time settles the matter. There is no download, no account and no clutter, just a clean face and four buttons.

What the lap button is really for

The lap feature is what turns a plain stopwatch into a measuring instrument. Each time you tap Lap, the tool records two things: the split, which is the time since your last tap, and the running total. It then lists them so you can compare your efforts at a glance. Runners use this to see whether they are speeding up or fading across repeated intervals; anyone rehearsing can use it to check how long each section takes and trim the parts that run long. Because the timing is tied to your device's high-resolution clock rather than a crude counter, it stays accurate even when the page is busy doing other things, and the laps remain on screen until you reset.

Timing across every scale

A stopwatch is the right tool for seconds and minutes, but time comes in many sizes, and the rest of the toolkit picks up where it leaves off. If you need to count down to a moment in the future rather than measure time as it elapses, the countdown timer is the one to reach for. For spans measured in days, weeks or years rather than minutes, the date-difference and age calculators take over, and the working-days calculator handles the special case of business days. Together they let you measure any stretch of time, from the hundredth of a second on this page to the decades of a lifetime.