Alarm options
Space start / pause · R reset · F fullscreen
A 45 minutes timer, ready to start
This timer is already set to 45 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.
What people use a 45 minutes timer for
- A school lesson or lecture (many are 45 minutes)
- A gym session or long run
- An exam or practice test section
- A deep-work focus block
- A board game or debate round
Many schools plan 45-minute lessons — put this timer on the classroom screen in full screen.
Features
- Ready at 45 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 and a progress bar
- 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
- A stopwatch too, one tab away
How to use it
- Press Start (or the Space bar) — the 45 minutes 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 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.
Can I show the timer on a projector or TV?
Yes. Click Fullscreen: the time fills the whole screen with a progress bar, and the screen stays on while it runs.
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
- Pomodoro Timer — work and break cycles
- Online Clock — a big full-screen clock
