ToolStack › Countdown Timer
Productivity

Countdown Timer
& Stopwatch

Three tools in one: a custom countdown timer with alarm sound, an event countdown clock that counts down to any date and time, and a precision stopwatch with lap tracking. All free, all in your browser.

Hours
Minutes
Seconds
05:00
Ready
Alarm:
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📖 How to Use This Timer
Three modes — each works differently. Here's exactly how to use each one.
⏱️ Mode 1: Countdown Timer
1
Set your time
Use the ▲ ▼ arrows to adjust hours, minutes, and seconds — or click directly into any field and type a number. Use the preset buttons (1 min, 5 min, 10 min, etc.) to jump to common durations instantly. The ring gauge fills as you set longer times.
2
Start the timer
Click ▶ Start — the ring begins draining clockwise as time counts down. Click ⏸ Pause at any point to freeze it without losing your place. Click Start again to resume from exactly where you left off.
3
Alarm when done
When the timer hits zero, the selected alarm plays and the display flashes red. Choose your alarm sound using the Alarm dropdown — Beep, Bell, Chime, Buzzer, or Silent. Use ▶ Test to preview it before starting. Check Repeat alarm to keep it sounding until you reset.
4
Reset and reuse
Click ↺ Reset to return to your set time and start over. The timer remembers the last duration you set — so after cooking pasta once, hitting Reset and Start again is all it takes for the next batch. Use ⛶ for fullscreen mode on a big screen.
📅 Mode 2: Event Countdown
1
Name your event
Type a name in the Event Name field — it appears on the countdown display. This is optional but makes the countdown feel personal ("My Wedding", "Launch Day", "Finals Week"). It doesn't affect the calculation.
2
Set the target date
Click the Date field and pick your target date from the calendar. Optionally set a Time for precision countdowns (e.g. 11:59 PM for New Year's, or 9:00 AM for a meeting). Without a time, midnight is used.
3
Use quick events
Click any Quick Event button (Christmas, New Year, Halloween, etc.) to instantly load that date. The days remaining are shown on each button so you can see at a glance how far away each is without setting anything manually.
4
Read the countdown
The display shows days, hours, minutes, and seconds updating live every second. The total days remaining is shown below. If the date has already passed, the display shows how long ago it was instead.
🏁 Mode 3: Stopwatch
1
Start timing
Click ▶ Start to begin. The stopwatch counts up with hundredths-of-a-second precision. The ring fills as time progresses (it resets every 60 seconds to keep showing progress). Click ⏸ Pause to freeze the time at any point.
2
Record lap times
Click ◉ Lap while the stopwatch is running to record the current time without stopping it. Each lap shows: the lap number, the cumulative time, the lap split (time since last lap), and the difference from the fastest lap. The fastest lap is highlighted green, the slowest in amber.
3
Pause and resume
Clicking ⏸ Pause freezes the timer. Click ▶ Resume to continue from that point. You can record a lap immediately before pausing to capture a segment time precisely. The Lap button is disabled when paused to prevent accidental recordings.
4
Reset and clear
Click ↺ Reset to zero the stopwatch and clear all lap times. This cannot be undone — if you need the lap data, write it down or screenshot first. The stopwatch is ready to start immediately after resetting.
Keyboard shortcuts: Press Space to start/pause the active timer or stopwatch. Press L to record a lap (stopwatch mode). Press R to reset. Press 1 / 2 / 3 to switch between Timer, Event Countdown, and Stopwatch modes. These shortcuts work when you're not typing in an input field.

Why use an online timer instead of your phone?

Your browser stays on screen while you work, whereas your phone timer gets buried under other apps. An online timer is ideal when you're working at a computer — studying, cooking with a recipe open, running a meeting, or timing a presentation. It's always visible in your browser tab, the tab title updates with the remaining time so you can see it without switching tabs, and you don't need to unlock your phone every time you want to check it.

How lap timing works

Lap timing records the total elapsed time at each press, then calculates the time between consecutive laps (the "split"). If Lap 1 is at 1:23.45 and Lap 2 is at 2:51.10, the split for Lap 2 is 1:27.65. The fastest split is highlighted green and the slowest in amber — which is useful for running (identifying which laps you slowed down) or tracking any repetitive timed task where consistency matters.

Tab title countdown

When your countdown timer is running, the browser tab title updates with the remaining time every second — so you can see "04:32 – Timer" in your tab bar without switching to this tab. This works in all modern browsers. It's especially useful when you have the timer running in a background tab while working in another window. The tab title resets to normal when you pause or the timer finishes.

Common timer uses

Cooking and kitchen timers. Pomodoro study sessions (pair with our Pomodoro Timer for structured sessions). Workout intervals and rest periods. Presentation rehearsal. Meeting time management. Egg timing, pasta, baking. Meditation and breathing sessions. Game show buzzers. Classroom quiz timing. HIIT workout rounds. Speech practice. Board game turn timers. Any situation where you need to know when a fixed amount of time has passed.

Frequently Asked Questions
Will the alarm still go off if I switch tabs? ▾
Yes — the timer continues running in the background even when you switch to another tab. The alarm will play when the timer reaches zero regardless of which tab is in focus, as long as you haven't muted your browser or system audio. Modern browsers throttle background JavaScript slightly, which can cause up to 1–2 seconds of drift on very short timers, but for timers longer than 30 seconds the accuracy is effectively perfect. The tab title also counts down, so you can see the time remaining without switching back.
How accurate is the stopwatch? ▾
The stopwatch uses JavaScript's performance.now() API which provides sub-millisecond precision. In practice, display updates happen every 10ms (hundredths of a second), which is accurate enough for most uses — sports timing, workout intervals, presentations, and tasks. For competition-grade precision (e.g. professional athletic timing), dedicated hardware stopwatches are used, but for everyday use the accuracy is completely reliable. The total elapsed time is calculated from actual clock timestamps, not counted ticks, so pausing and resuming doesn't accumulate error.
Can I set a timer for more than 60 minutes? ▾
Yes — the hours field goes up to 99, so you can set timers up to 99 hours, 59 minutes, and 59 seconds. Type directly into the hours field or use the ▲ arrow button. For example, to set a 2-hour timer: set hours to 2, minutes and seconds to 0. The ring gauge shows progress relative to the total time set, so a 2-hour timer fills exactly the same visual arc as a 5-minute one — the ring always drains from full to empty over whatever duration you set.
How do I count down to a specific date and time? ▾
Click the "Event Countdown" tab. Enter your event name (optional), then select the target date using the date picker. If you want to count down to a specific time — like midnight, 9:00 AM, or 3:30 PM — enter that in the Time field. The countdown updates live every second, showing exact days, hours, minutes, and seconds remaining. Quick-event buttons for common dates (Christmas, New Year, Halloween) are provided so you don't have to look up the dates manually.
How to Use the Countdown Timer & Stopwatch

Set countdown timers for any duration, or use the stopwatch with lap tracking.

01
Choose countdown or stopwatch mode
Use the tabs at the top. Countdown counts down from a set time; stopwatch counts up from zero.
02
Set your countdown duration
Enter hours, minutes, and seconds. For common durations, use the quick-set buttons: 5 min, 10 min, 25 min (Pomodoro), 1 hour.
03
Start and manage the timer
Press Start. Pause at any time without losing progress. Reset returns to your original duration so you can restart quickly.
04
Enable sound alerts
Turn on the audio notification to hear a chime when the countdown reaches zero — essential if you're doing something else while the timer runs.
05
Use lap in stopwatch mode
Press Lap while the stopwatch is running to record split times. Useful for timing intervals, race splits, or multi-step tasks.
💡
💡 Pair this with the Pomodoro Timer for structured work sessions. Use countdown for single-task focus; use the stopwatch to see how long tasks actually take vs how long you think they take.