Online Stopwatch
A simple online stopwatch with lap timing.
Assumptions used in this calculation
- No persistence: Elapsed time and laps are kept only in the browser session and reset to zero if the page is refreshed or closed.
About this calculator
Not everyone has a dedicated stopwatch on hand, and a phone's built-in timer app isn't always convenient to reach mid-activity, especially when you're already looking at a screen for something else, like a recipe or a workout plan. This online stopwatch lets you start, stop and reset a running timer directly in the browser, and record individual lap times without losing the overall elapsed time, tracked against your device's system clock to the nearest hundredth of a second. It's useful for timing workouts and interval training, keeping a presentation or speech within a time limit, timing a cooking step, or any activity where you need a precise running total plus a record of individual segments.
Worked example
Timed workout with laps
Result: Live elapsed time
Was this helpful?