β±οΈ Countdown Timer & Stopwatch
Count down from a set time, track elapsed time, or count to a future date.
How to Use This Tool
Choose a mode from the three tabs: Countdown for a fixed duration, Stopwatch for elapsed time, or Event for counting down to a specific future date and time. Each mode has Start, Pause, and Reset controls.
Select Countdown, enter hours/minutes/seconds, then click Start. The display counts down and plays a beep at zero.
Select Stopwatch and click Start. The timer counts up in hundredths of a second. Use Lap to record split times.
Select Event, enter a name and future date, then click Start Countdown. It shows days, hours, minutes, seconds remaining.
Use Pause to hold any timer and Reset to clear it back to zero.
Common Use Cases
Why Timer Accuracy Matters
Browser-based timers use JavaScript's setInterval, which has accuracy of roughly 10-50 milliseconds per tick. For everyday tasks β cooking, studying, presentations β this is plenty accurate. The stopwatch uses Date.now() as its reference so accumulated drift is essentially zero even over long sessions: each tick recalculates elapsed time from the original start moment rather than just adding a fixed increment.
The Pomodoro Technique is the most researched timer-based productivity method. The standard protocol is 25 minutes of focused work followed by a 5-minute break, repeated four times before a longer 15-30 minute break. Using a visible countdown makes the work period feel bounded and defensible, which research shows reduces both internal distraction and the urge to multitask.
Frequently Asked Questions
Can I count down to a specific date?
Yes β enter any future date and time to get a live countdown showing days, hours, minutes, and seconds remaining.
Does the timer work in background tabs?
Modern browsers may throttle JavaScript timers in background tabs. For precise timing, keep the tab active.
Can I get an audio alert when the timer ends?
Yes β the browser plays a beep using the Web Audio API when the countdown reaches zero.
What is a stopwatch vs countdown timer?
A stopwatch counts up from zero. A countdown timer counts down from a set time to zero. Both are here.
How accurate is this timer?
Browser setInterval has typical accuracy of Β±10β50ms. For everyday use this is more than sufficient.