Online Stopwatch with Laps & Split Export

Every press of Lap records two numbers. The lap time is how long that segment took, measured from the previous Lap press. The split time is the total elapsed time on the clock at the moment you pressed it. A runner doing four 400 m repeats who presses Lap at 1:32.40, 3:05.10, 4:36.95 and 6:10.20 ran laps of 1:32.40, 1:32.70, 1:31.85 and 1:33.25.

• Use lap times to compare effort between repeats, sets or presentation sections.
• Use split times when you need to know where you were against a total target, such as a 25-minute talk or a race pace plan.
• Fastest and slowest are marked once you have two or more laps; ties go to the earlier lap.

• Interval training: record each repeat and export the session to track pace over weeks.
• Speeches and rehearsals: press Lap at each section change to see which part runs long.
• Lab and classroom timing: reaction experiments, pendulum periods (time 10 swings and divide by 10 to reduce reaction error) and chemistry reactions.
• Work sampling: time repeated tasks to estimate a realistic standard time.

For counting down to zero instead of counting up, use a countdown timer; a stopwatch measures how long something took.