Classroom length without a dedicated hardware timer
Hardware timers die or get borrowed. This browser timer is the same tool students can reopen at home. For a full hour lecture, use the 60 minute timer; for a short station, try 10 or 15 minutes.
45:00
45:00
Up next
While running, tap a preset to queue up to 3 timers.
Presets
One tap: skin, backdrop, and motion.
Ready
00:30
Ember focus
D · display mode
Time’s up!
Photo gallery
Tap a photo to set the stage backdrop. Instant looks still control skin and motion.
Timer settings
Set a custom duration and title, then fine-tune look and alarm if you need to.
Timer setup
Appearance
Looks on the stage already set the scene. Here: digit style, photo gallery / custom photo, and display blur.
Digit style
Custom photo
Sound
Volume
Saved setups
Favorites
No favorites yet. Set up a timer you like, then tap "Save current".
History
No completed timers yet. Finish a countdown to see it here.
More timers
More durations or a short countdown to a date — pick a pane.
Durations
Seconds
Hours
Countdown
Custom date & time
Day of week
Time of day
Date & holiday countdowns
Live days–hours–minutes–seconds to any date or holiday.
Learn more
Forty-five-minute countdown
A 45-minute period, ready for the room
Forty-five minutes matches many school periods and exam sections. This page opens at 45:00. Put it on the projector, press Start, and let the alarm end the block without watching a wall clock.
A visible 45-minute countdown reduces “how much time is left?” interruptions. Sleep and fullscreen keep the digits large. You can still add a minute if the bell schedule slips.
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01
Start at 45:00
Start the forty-five-minute countdown when the period begins. Queue a 5-minute wrap-up if you want a warning before the alarm.
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02
Start the countdown
Press Start or Space. Progress updates on a circular dial, and the face shows when the timer ends. Pause anytime, add +1 min, queue another timer, or go fullscreen / sleep for a distraction-free display. The tab title shows remaining time while you work elsewhere.
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03
Hear the alert & keep going
When time is up, stop the alarm with one tap. Start the next queued timer, review local history, export CSV, or copy a shareable link. A refresh restores an in-progress countdown on this device.
What you get
- Presets & quick lengths Jump to common seconds, minutes, and hours, or named timers like study and classroom. The Countdown pane still offers weekdays, times of day, and a custom datetime — holiday countdowns are on the Online Countdown tool.
- Background-tab accuracy Countdown uses deadline math so it stays correct when the browser throttles hidden tabs.
- Sounds, notifications & wake lock Choose alert sounds and ring length, get a desktop notification when finished, and keep the screen awake while running.
- Fullscreen & sleep mode Go fullscreen for a large dial display, or sleep to dim the whole page so only the countdown stays visible.
- Up-next queue While a timer is running, tap presets to queue up to three countdowns and start the next when you are ready.
- Embed widget Drop a compact countdown on your site with custom colors, size, skin, and default duration.
Frequently asked questions
Setting the dial, presets, alerts, and embeds — quick answers.
Can the whole class see this 45 minute timer?
Yes. Fullscreen on a shared display. Display mode and high-contrast looks help from the back row.
What if the period is 50 minutes, not 45?
Start this 45:00 timer and press +1 min five times, or tap the dial and type 50. The 45-minute page is the preset; the dial is still editable.
Will talking or other tabs stop the 45 minute countdown?
No. It uses an end deadline. Other tabs may slow animations, but the remaining time stays correct when you look back.
Can I embed a 45 minute timer in a lesson site?
Yes. Copy the iframe from the embed section. Set the widget’s default duration to 2700 seconds so students see 45:00 inside the frame.