4 Hour Timer (4h Timer)
Free online 4 hour (4h) countdown timer with alarm
Start a 4h timer for long focus sessions, study blocks, cooking, exams, or a half-day work countdown. Runs in the browser with alarm sound and optional notifications.
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Customise colour, duration and size →Use in Google Docs or Canva →About the 4 Hour Timer
A 4 hour timer, also written 4h, that runs from an absolute finish time so a sleeping laptop or throttled tab cannot make it drift. Shows the clock time it ends at, fullscreens for a shared screen, and alarms at zero.
TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.
Common Uses
- Four-hour study block
- Long focus session
- Project deadline countdown
- Slow cooking reminder
- Half-day work timer
How to Use the 4 Hour Timer
- Press Start — or the Space bar — to run the 4 hour countdown. Space also pauses and resumes it; R resets it
- Adjust by 5 minutes with the +/- buttons while it runs, toggle Repeat to loop it, and check the finish time shown under the display
- Use the Fullscreen control below the timer for a room-sized countdown (Esc to exit)
- Choose or mute the alarm in the header's sound settings, and pick a background sound — rain, ocean, fireplace or brown noise — that fades out at zero
- Enable notifications to be alerted when your 4 hour timer finishes in a background tab, and add
?autostart=1to the link to start the countdown on load
Frequently Asked Questions
How long is 4 hours in minutes?
4 hours is exactly 240 minutes or 14,400 seconds. Our free 4-hour countdown timer tracks every second and sounds an alarm when done.
What is a 4 hour timer used for?
A 4 hour timer is commonly used for four-hour study block, long focus session, project deadline countdown. Set the countdown and focus on your task with confidence.
Does the timer work in the background?
Yes, our timer continues running even if you switch to another tab or minimize your browser. Enable push notifications to get alerted when your countdown finishes.
Will the alarm sound after 4 hours?
Yes, an alarm sound plays automatically when the 4-hour countdown reaches zero. You can also enable push notifications for an extra alert, even if you’re in another tab.
Can I make the timer fullscreen?
Yes, use the Fullscreen control below the timer for a distraction-free full-screen countdown — useful for long study sessions, offices, and shared screens. Press Esc to exit fullscreen.