Online stopwatch and countdown timer

Use the stopwatch to measure elapsed time or set a countdown for a chosen duration. Lap times stay visible on the page, and no installation is required.

00:00:00

Choose a mode and start.

Recorded laps

    How to use the stopwatch

    1. Choose stopwatch or countdown mode.
    2. For a countdown, enter hours, minutes and seconds, then select Set duration.
    3. Start, pause or reset the timer. In stopwatch mode, record intermediate lap times.

    When it can help

    • Study: set a focus period or a break.
    • Exercise: note intervals and lap times; this is not a certified sports timing device.
    • Cooking and meetings: keep track of a duration without installing software.

    Accuracy and limitations

    The display updates in your browser using the page’s monotonic clock. Browsers may slow visual updates in background tabs, and settings or silent mode can block the alert sound. Keep the page open. Do not use this tool for official timing or safety-critical tasks.

    Frequently asked questions

    Does the stopwatch stay accurate in another tab?

    The calculation uses a monotonic clock, but a browser may slow visual updates in background tabs. Use a suitable device for critical measurements.

    Can I record lap times?

    Yes. In stopwatch mode, select Record lap to add the displayed time to the list.

    Will the sound alert always play?

    At zero, the countdown attempts to play a tone. Browser restrictions or silent mode may block it, so check the on-screen display.