How to Time Tasks, Laps and Events Accurately

Use laps to compare stages of the same activity rather than relying on one total.

Use the Stopwatch alongside this illustrative example.

A practical example

For a three-stage rehearsal, record a lap after the introduction, demonstration and questions. A total of six minutes does not reveal whether the introduction used four minutes; the splits do. Copy the lap record before resetting so the next rehearsal can be compared.

Check the result

Use the same start and end cues each time. Human reaction time and device input delay can be larger than the hundredths shown on screen.

Try a comparison

Compare cumulative lap times with individual stage durations. If a lap marks two minutes and the next marks five minutes, the second stage lasted three minutes. Do not interpret the five-minute cumulative mark as five additional minutes.

What this does not establish

A browser stopwatch is not calibrated sporting or laboratory equipment. Keep an external record if the result matters after the tab is closed.

Report unclear guidance or a result that needs checking.