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Stopwatch

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A stopwatch that times to hundredths of a second and records lap splits as you go, so you can capture intervals without stopping the overall count.

Laps are the feature that makes a stopwatch more useful than a clock. Each lap records the time since the previous one while the total keeps running, which is what you want for intervals, sets, or repeated attempts.

How to use it

  1. Press start to begin timing.
  2. Press lap to record a split without interrupting the running total.
  3. Press stop to pause, and reset to clear the timer and all recorded laps.

What it is useful for

  • Interval training, where each lap captures one work or rest period.
  • Timing presentations or rehearsals, recording how long each section actually takes.
  • Cooking steps that need to be tracked within a longer overall time.
  • Timing repeated attempts at a task to see whether you are getting faster.
  • Classroom activities where students time experiments or races.

Frequently asked questions

What is the difference between lap time and total time?
Lap time is the interval since the previous lap was recorded; total time is the elapsed time since you pressed start. Recording a lap does not interrupt the total.
Does the stopwatch keep running if I switch tabs?
Timing is based on elapsed clock time rather than counting frames, so it stays accurate when the tab is in the background.
How precise is it?
It displays hundredths of a second. Practical accuracy is limited by your reaction time pressing the buttons, which is typically a fifth of a second or so.