Millisecond Timer

This is a countdown timer that displays minutes, seconds, and milliseconds. Enter a custom duration or choose a preset, then start, pause, resume, or reset the countdown.

The timer reconciles against the browser performance clock while it is running, so the visible display updates with milliseconds rather than only whole seconds.

Use it for short timing drills, animation checks, video or audio timing, quick developer tests, classroom demos, games, practice timing, or any countdown where seconds alone are too coarse.

For elapsed timing instead of countdown timing, use the stopwatch with milliseconds. For a simpler whole-second countdown, use the seconds timer. For current time with milliseconds, use the clock with milliseconds.

A duration of 1000 milliseconds is one second. A duration of 1500 milliseconds is one and a half seconds. If you need to convert values instead of run a countdown, use the milliseconds converter.

Browser update rate, inactive tab throttling, display refresh rate, and device performance can affect the visible millisecond display. This page is useful for practical browser timing, not calibrated measurement.

Can I set 1000 milliseconds?

Yes. Set milliseconds to 1000 by using the 1 second preset, or set 0 minutes, 1 second, and 0 milliseconds in the custom inputs.

How is this different from the countdown timer?

The countdown timer is a general minutes-and-seconds timer. This page is built around a millisecond display and millisecond input.

Can I use it for reaction practice?

For click-response practice, use the reaction time test. This page is a countdown timer, not a reaction measurement tool.