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Classroom Timer

Bell-clear digits sized for the back of a room.

Press F for fullscreen
10:00
:

About Classroom Timer

The classroom timer is a 10-minute default countdown sized for projection. The digits use a heavy tabular numeric face so the kids in the back row can read them. Reset and edit the duration without leaving the keyboard. Built for teachers who need to time a quiz, a silent-reading block, or a transition between activities without watching a clock on the wall.

Designed for the Back Row

The digits scale up to 22vw on large panels, which at a typical classroom throw of 8 meters is roughly 18cm tall. The tabular-nums font variant keeps every digit the same width so the colon never jitters as numbers tick down. Contrast is tuned for a projector with a slightly washed-out bulb, not a reference monitor.

Keyboard-First for Teachers

Space starts and pauses. R resets to the original duration. Arrow keys nudge the edit time in one-minute steps. You can edit the duration with your eyes on the class instead of the keyboard, which is the point.

How to use it

  1. 01

    Edit the duration

    Before pressing Start, click the minutes and seconds to change them, or use the up/down arrows. Default is 10 minutes.

  2. 02

    Press Start

    The countdown begins. Digits are readable from anywhere in the room.

  3. 03

    Pause or Reset mid-run

    Press Space to pause, R to reset to the full duration. Both work without touching the mouse.

  4. 04

    Project fullscreen

    Press F so the timer fills the projector output. The black background keeps the room dim.

Frequently asked

The shortest path between you and the answer.

Can I set it to 45 minutes?

Yes. Edit the minutes field before starting. Any duration up to 99:59 works.

Is this tool free?

Yes. Every ScreenTools.co tool is free, with no account, no paywall, and no install.

Does it work on mobile?

Yes. Layouts adapt to phone and tablet screens. Mobile Safari restricts true fullscreen, but the page fills the viewport and you can add the page to your Home Screen for an app-like experience.

Does it work offline?

Once a tool's page has loaded once, the runtime is local. A few tools that fetch fonts or icons need the first hit online; after that, refresh works offline.

Does this collect my data?

No personal data leaves your browser. The site has lightweight, privacy-respecting analytics for aggregate counts (which tool was opened) and nothing else.

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