What is Stopwatch & Countdown Timer?
This combined tool gives you two essential timing utilities: a stopwatch that counts up with hundredth-of-a-second precision and lap recording, and a countdown timer that counts down from a set time and sounds an alarm when it reaches zero. Switch between them with a single tap.
Both are accurate, easy to read with large digits, and work entirely in your browser without any app to install.
How to Use the Stopwatch & Countdown Timer
- Choose the Stopwatch or Countdown tab.
- For the stopwatch, press Start and use Lap to record split times.
- For the countdown, set minutes and seconds, then press Start.
- The countdown sounds an alarm and shows a message when it finishes.
Features of Our Stopwatch & Countdown Timer
- Precise stopwatch with hundredths of a second
- Unlimited lap recording
- Countdown timer with audible alarm
- Large, easy-to-read display
- Pause, resume and reset controls
- Works fully offline
Benefits & Use Cases
Use the stopwatch for workouts, cooking, study sessions and timing tasks, and the countdown for interval training, presentations, exams and reminders. Lap times help you track performance across repeated efforts.
Everything runs in your browser, so it is instantly available on any device with no ads interrupting your timing.
The Stopwatch & Countdown Timer is completely free, needs no sign-up or installation, and runs entirely in your browser — nothing you enter is uploaded to a server, so your data stays private. It works on desktop, tablet and mobile, in light or dark mode.
Tips & Best Practices
Use the stopwatch with Lap to record split times for workouts, study sprints or timed tasks, and the countdown for interval training, presentations and cooking. Because timing runs off your device clock, keep the tab open and your screen awake so the alarm fires reliably when the countdown reaches zero.
For longer spans, measure whole days between dates with the Date Difference Calculator, or work with exact moments using the Timestamp ⇄ Date Converter.
FAQ about Stopwatch & Countdown Timer
How accurate is the stopwatch?
It measures elapsed time from the system clock and displays hundredths of a second, so it is accurate enough for everyday and sports timing.
Does the countdown make a sound?
Yes. When the countdown reaches zero it plays an audible beep alarm and shows a Time's up message.
Can I record lap times?
Yes. Press Lap while the stopwatch runs to record split times, which appear in a list below the display.
Will it keep running if I switch tabs?
The timer keeps counting based on the clock, but for reliable alarms keep the tab open and your device awake.