150 Second Timer

About this one hundred fifty second timer

This one hundred fifty-second countdown runs entirely in your browser. Handy for interval training, brief meditations, or short timed games. There is nothing to install, nothing to sign up for, and no data is uploaded when you start, pause, or reset.

How long is 150 seconds? 2 minutes and 30 seconds. That is a standard boxing round, a French-press brew, a rest between heavy sets, or a short presentation slot.

A one hundred fifty-second timer sits between two and three minutes. It is useful for timed drills, short focus bursts, tea steeping, and anything where a flat two minutes feels slightly too short.

Because this timer is only a few minutes long, it is ideal for testing the sound setting — start the countdown, let it run, and make sure the end-of-timer tone is audible at the volume you will actually use.

How to use this timer

• Press Start (or the spacebar) to begin the countdown.
• Press Pause (or the spacebar again) to hold the current time.
• Press Reset (or the R key) to return to 150:00.
• When the timer ends, a short tone plays. Click, tap, or press any key to stop it.
• Use the sound toggle to mute the alert — your preference is remembered on this device.

Tips for accurate timing

• Keep this tab visible. Modern browsers slow down background tabs to save power, which can delay the end alert.
• On mobile, keep the screen awake or plug the device in for long sessions.
• For anything safety-critical, use your device's built-in system timer rather than a web page.

Related timers: 100 second timer, 180 second timer, or 200 second timer.

Looking for a different duration? Browse the TimerZen home page or type any whole-number duration into the URL (for example, /45-minute-timer/, /90-second-timer/, or /2-hour-timer/).

Last reviewed on April 24, 2026.