Timers

Online Stopwatch

By 3 min read Evidence based

Time a run, a workout, a speech or a nap. Start, stop, resume and record laps with hundredth of a second accuracy.

Stopwatch

Start, stop and record laps. Accurate to a hundredth of a second.

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    On this page
    1. How to use the stopwatch
    2. What a stopwatch is useful for

    How to use the stopwatch

    Press Start to begin. Press Lap to record a split without stopping the clock. Each lap shows the time for that lap and the total so far, with the newest lap on top. Press Stop to pause and Resume to continue, or Reset to clear everything.

    What a stopwatch is useful for

    • Running laps and finding your running pace.
    • Timing rest between gym sets (60 to 90 seconds for muscle, 2 to 3 minutes for heavy lifts).
    • Timing how long you take to fall asleep. Healthy adults usually take 10 to 20 minutes.
    • Practising a talk or a presentation.
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    Frequently asked questions

    How accurate is the online stopwatch?

    It uses your device clock and updates every screen refresh. It is accurate to about one hundredth of a second for everyday use.

    Can I use it on my phone?

    Yes. It works in any modern browser on phone, tablet and desktop.

    Does it keep running if I switch tabs?

    Yes. The time is calculated from the clock, so it stays correct even if the tab was in the background.

    Medical references: for evidence based health information see CDC Sleep and Sleep Disorders, NIH NHLBI on Sleep Deprivation, American Academy of Sleep Medicine Sleep Education and MedlinePlus. This page is general information, not medical advice.