Alarm options
Space start / pause · R reset · F fullscreen
A 40 minute timer, ready to start
This timer is already set to 40 minutes. Press Start — or the Space bar — and it counts down, then plays an alarm when the time is up. No setting up, no sign-up, nothing to install.
Leave it in a tab while you work: the time left shows in the browser tab, so you can see it from any other tab. Or press Fullscreen to fill the screen with big numbers and a progress bar — handy in a classroom, a kitchen or a meeting room.
Features
- Ready at 40 minutes — or click another preset, or type any time
- Four alarm sounds — beep, bell, digital watch or a gentle chime — that keep ringing until you press Stop
- Ends at — see the clock time when the timer will finish, and add +1 min while it runs
- The time left in the browser tab, which blinks "Time's up!" at the end — plus an optional notification
- Fullscreen with big digits, a progress bar and six colour themes
- Keeps the screen on while it runs, so a phone or laptop does not go dark
- Pause and resume without losing the time left
- Keyboard shortcuts: Space start / pause, R reset, F fullscreen
What people use a 40 minute timer for
- A 40-minute lesson or class period
- A workout or a run
- Baking a cake, brownies or a tray of potatoes (35–45 minutes)
- A study or homework block with a break after it
- A meeting slot or a kids' screen-time limit
Many school periods and gym classes last 40 minutes — put the timer in full screen so the whole room can see it.
How to use it
- Press Start (or the Space bar) — the 40 minute countdown begins
- Press Pause to stop for a moment and Resume to go on
- Press Fullscreen to show the timer big on your screen
- When the alarm rings, press Stop, then Reset to start again
Frequently asked questions
Does the timer keep running in another tab?
Yes. You can switch tabs or minimize the window; the timer keeps counting and the alarm rings on time. Just do not close this tab.
Will the alarm ring if my computer goes to sleep?
No — a sleeping computer runs nothing. That is why the timer asks the browser to keep the screen on while it counts down.
How long do I bake potatoes?
Cut potatoes roast in about 35–45 minutes at 200 °C (400 °F); whole baked potatoes take about an hour. Check with a knife — it should slide in easily.
Can I change the alarm sound?
Yes. Open Alarm options and pick a beep, a bell, a digital watch or a gentle chime — you hear it when you choose it. You can also let it ring just once, or keep ringing until you press Stop.
Is it free?
Yes. No sign-up and nothing to install, and it works offline once the page is open.
Related tools
- Timer & Stopwatch — set any time
- Visual Timer — a coloured disc that shrinks as time runs out
- Pomodoro Timer — work and break cycles
