Stopwatch & Timer
Stopwatch and countdown timer tool
Controls
Quick timers
The countdown uses your device clock. A suspended tab or sleeping device can delay the alarm.
Start the stopwatch or set a countdown. Timing stays on this device.
Stopwatch
Laps 0
Record a lap while the stopwatch is running.
About Online Stopwatch & Timer
Our free online stopwatch and countdown timer delivers precise time measurement with nothing to install. Time interval sets at the gym, run 25-minute Pomodoro blocks, or count down the last five minutes of a talk, with a millisecond readout and nothing else on screen.
The stopwatch mode features start, pause, reset, and lap controls so you can record split times during races, drills, or any activity that requires interval tracking. Every lap is displayed with both the individual split and the cumulative total for easy comparison.
The countdown timer mode lets you set custom durations down to the second, choose from quick presets (1, 5, 10, or 25 minutes), and receive an audio alert when time is up. A toggleable sound setting ensures it works in quiet environments as well as noisy ones.
Key Features
- High-precision stopwatch with centisecond (1/100 s) display
- Unlimited lap recording with split & total times
- Customizable countdown timer with minutes & seconds controls
- Quick timer presets: 1 min, 5 min, 10 min & 25 min (Pomodoro)
- Audio alert when the countdown reaches zero
- Sound on/off toggle for quiet environments
- Start, pause, resume & reset controls for both modes
- Large, easy-to-read monospaced time display
- Fully responsive layout for phone, tablet & desktop
- No installation or sign-up required
How to Use
- Choose a mode: Click the "Stopwatch" or "Timer" tab at the top to switch between modes.
- Start the stopwatch: Press the green Start button to begin timing; press Lap while running to record a split.
- Set a countdown: In Timer mode, adjust the minutes and seconds using the + / - buttons or select a quick preset.
- Control playback: Use Pause to freeze the clock, then Start again to resume, or Reset to clear and start over.
- Toggle sound: Click the sound button to enable or disable the alarm that plays when the countdown ends.
- Review laps: Scroll through the lap list to compare splits and identify your fastest & slowest intervals.
Use Cases
- Sports & athletics: Time sprints, laps, and relay handoffs with centisecond precision.
- Pomodoro technique: Use the 25-minute preset for focused work sessions, then rest with a 5-minute timer.
- Cooking & baking: Set a countdown to avoid over- or under-cooking your meal.
- Classroom activities: Give students a timed quiz or limit group discussion rounds.
- Public speaking practice: Track speech duration to stay within allotted time.
- Meditation & mindfulness: Set a gentle timer for breathing exercises or quiet reflection.
- Fitness & HIIT workouts: Alternate work and rest intervals with accurate countdowns.
- Board games & chess: Enforce turn time limits for a fairer game experience.
Frequently Asked Questions
How accurate is the stopwatch?
The display shows hundredths of a second, and elapsed time is measured against your device clock, so it stays accurate even when the tab is in the background or the device is busy. It is more than sufficient for everyday timing, though not a substitute for certified race timing equipment.
Will the timer alarm work if I switch tabs?
The countdown derives remaining time from your device clock, so it catches up when you return to the tab. Enable sound for an audio alert. Browser throttling, a suspended tab or a sleeping device can delay the alarm.
Can I use this on my phone?
Absolutely. The interface is fully responsive and works great on any smartphone or tablet browser.
Tips & Best Practices
- Use lap splits for interval training: Record each set or round and compare splits to track improvement over time.
- Try the Pomodoro preset: Work for 25 minutes, break for 5, repeat. It is one of the most effective productivity techniques.
- Keep the tab pinned: Pin this browser tab so the timer is always one click away during your workflow.
- Mute sound in quiet spaces: Toggle sound off before using the timer in libraries, offices, or meetings.
- Reset before each session: Always reset the stopwatch or timer to zero before starting a new measurement to avoid stale data.
- Combine with full-screen mode: Press F11 for a distraction-free, large-digit display during presentations or group activities.