Online Stopwatch

A lap is one measured segment within a longer timing session. The term comes from racing, where each trip around a track or course is a lap. Stopwatches use the same word for any repeated segment, even when you are not moving around a track.

Selecting Lap records that segment without stopping the main stopwatch, so you can compare parts of one continuous session.

Use laps whenever one continuous activity contains smaller parts you want to compare. For example:

• Time each circuit of a run, swim, or bike ride.
• Compare sets, drills, or rounds during a workout.
• Record how long each speaker, presentation section, or practice task takes.
• Measure stages of cooking, assembly, testing, or another multi-step task.

Lap Time is the time since you started the stopwatch or recorded the previous lap. Total Time is all elapsed time since you first selected Start, excluding any time while the stopwatch was paused. For example, if Lap 1 ends at 00:30 and Lap 2 takes another 00:25, Lap 2 shows a lap time of 00:25 and a total time of 00:55.

The stopwatch measures the time between selecting Start and selecting Stop. It checks your device clock instead of counting screen updates, so a slow screen refresh does not make the stopwatch gradually lose time.

The display shows hundredths of a second, but it is not professional timing equipment. The speed of your button press, a sleeping device, or a change to the device clock can affect the result. It is suitable for everyday timing, but not for scientific tests, official races, or work where safety depends on exact timing.

You can visit another page on Just Set Alarm and return without stopping or resetting the stopwatch. A page reload, closed tab, or browser restart clears the stopwatch and all recorded laps.

Use this stopwatch to measure how long something takes. To count down toward a sound alert, use the online countdown timer. For guided work and rest rounds, try the workout interval timer. For focus sessions and scheduled breaks, use the online Pomodoro timer.