TimerStopwatch.com

12 Minute Timer

This free 12 minute timer counts down 12 minutes (720 seconds) and rings an alarm at zero. It is already set — press Start or the space bar and it begins. It keeps time in a background tab, and full screen makes the digits big enough to read across a room.

12:00
Ready

Set the time

Shortcuts Space start / pause R reset F full screen + add a minute Esc stop alarm

12 minutes at a glance

Duration12 minutes
On the clock0:12:00 (h:mm:ss)
In seconds720
In milliseconds720,000
In hours0.2
Share of a day0.83%
Start now, ends at—

What is a 12 minute timer good for?

Twelve minutes is the Cooper test — the running test Dr. Kenneth Cooper devised in 1968 — a quarter of an NBA basketball game, and a typical bake time for a tray of cookies.

  • The Cooper 12-minute run test
  • Baking cookies (about 10–12 minutes)
  • One quarter of an NBA game
  • Steaming vegetables

← 10 Minute Timer 15 Minute Timer →

How to use the 12 minute timer

  1. Press Start

    The timer is already set to 12 minutes. Press Start or Space.

  2. Watch the ring

    The ring empties as time passes, and the tab title counts down with it so you can check from another tab.

  3. Adjust if you need to

    Pause any time, press +1 min to add a minute, or change the time in the panel.

  4. Stop the alarm

    At zero the alarm rings. Press Stop alarm or Esc, or +1 min to snooze.

Other quick timers

One click starts the countdown — every preset rings an alarm, works full screen and keeps time in a background tab.

Seconds

Minutes

Hours

Frequently asked questions

How do I start a 12 minute timer?

Press Start (or the space bar) on this page — the timer is already set to 12 minutes. When it reaches zero the alarm rings until you stop it or the ring time you chose runs out.

How many seconds are in 12 minutes?

12 minutes is 720 seconds, or 720,000 milliseconds.

Will the 12 minute timer ring if I switch tabs?

Yes. The alarm is scheduled ahead on your browser’s audio clock, so background-tab throttling cannot delay it. Turn on notifications in the panel to get a pop-up too. If you reload the page, it keeps counting from where it was.

Can I pause the timer or add more time?

Yes. Pause stops the countdown and Start resumes it. +1 min (or the + key) adds a minute, and after the alarm it starts a one-minute snooze. To set a different length, use the time boxes, the number pad, or one of the other quick timers.

More free timing tools

Online Stopwatch Lap and split times to 1/100 s, best and worst laps, CSV export. Pomodoro Timer 25-minute focus sessions and breaks, with auto-start and a daily tally. Interval Timer HIIT, Tabata, EMOM and boxing rounds with 3-2-1 beeps and voice cues. Countdown to a Date Days, hours, minutes and seconds to any date and time zone, shareable by link. Tabata Timer20 seconds on, 10 seconds off, eight rounds — four minutes, done.

Last reviewed October 31, 2026