Classroom Timer
Set a countdown timer for activities, tests, breaks, and transitions. Preset times or enter your own custom duration.
Free Classroom Timer for Teachers
The SmarterSources Classroom Timer is designed for teachers, presenters, and anyone who needs a simple, full-featured countdown timer. Choose from preset durations or set a custom time. The large display is easy to read from anywhere in the room.
How to Use the Classroom Timer
Click a preset button or enter a custom duration using the hour, minute, and second inputs. Press Start to begin the countdown. The timer changes color as time runs low (yellow for the last 20%, red for the last 10%). An alarm sounds when time is up (if enabled).
Ideas for Using a Classroom Timer
Timed activities: Set time limits for group work, writing prompts, or lab experiments. Tests and quizzes: Give students a clear visual countdown. Transitions: Set 2-3 minute timers for switching between activities. Breaks: Use 5-10 minute timers for recess or brain breaks. Presentations: Keep student presentations on schedule.
Frequently Asked Questions
Does the timer work if I switch tabs?
Yes. The timer continues running accurately even if you switch browser tabs or minimize the window. It uses absolute time tracking to stay accurate.
Can I change or turn off the alarm sound?
Yes! Choose from 15 different alarm sounds across four categories: Traditional (Classic Bell, School Bell, Digital Beep), Fun (Chime, Celebration, Gentle Gong, Level Up), Funny (Sad Trombone, Cartoon Boing, Duck Quack, Air Horn), and Epic (Buzz, Pew-Pew, Magic Wand, Fairy Dust). Click the play button on any sound to preview it. You can also uncheck "Play alarm when time is up" to mute the alarm entirely.
Is my data safe?
Yes. This timer runs entirely in your browser. No data is sent to any server and nothing is stored.