Stopwatch

Stopwatch - Online Timer with Lap Counter & Split Times

A precise online stopwatch with millisecond accuracy for timing any activity. Features include unlimited lap recording, split times, fastest/slowest lap detection, statistics calculation, fullscreen mode, and keyboard shortcuts. Perfect for workouts, races, cooking, studying, or any activity that requires precise timing.

How to use the stopwatch?

Using the stopwatch is simple:

1. Click 'Start' or press Space to begin timing
2. Click 'Lap' or press L to record lap times while running
3. Click 'Pause' or press Space to pause the timer
4. Click 'Reset' or press R to reset to zero
5. Click fullscreen button or press F for fullscreen mode

The stopwatch shows time in format:
- MM:SS.MS (minutes:seconds.milliseconds)
- Or HH:MM:SS.MS for times over 1 hour

Keyboard shortcuts:
- Space: Start/Pause the stopwatch
- L: Record a lap (while running)
- R: Reset (when paused)
- F: Toggle fullscreen mode
- ESC: Exit fullscreen

Features:
- Precise to 10 milliseconds
- Unlimited lap recording
- Automatic fastest/slowest lap detection
- Real-time statistics
- Fullscreen mode for better visibility
- Copy all results to clipboard
- Works offline
- No ads or distractions

What are lap times and how do they work?

Lap times help you measure intervals during timing:

How laps work:
- Each lap records the time since the last lap
- First lap = time from start
- Subsequent laps = time since previous lap
- Total time continues running

Lap information shown:
- Lap number (Lap 1, Lap 2, etc.)
- Lap time (interval time)
- Delta (difference from previous lap)
- Fastest lap highlighted in green
- Slowest lap highlighted in red

Example - running 5 laps:
- Lap 1: 2:30.50 (first interval)
- Lap 2: 2:28.30 (2 seconds faster, -0:02.20)
- Lap 3: 2:35.10 (slowest lap, +0:06.80)
- Lap 4: 2:29.00
- Lap 5: 2:27.50 (fastest lap)
- Total time: 12:30.40

Use cases:
- Track running laps around a track
- Time swimming laps
- Measure workout intervals
- Monitor cooking stages
- Track study session segments
- Time presentation sections

What statistics are calculated?

The stopwatch automatically calculates useful statistics:

Statistics shown:

1. Total Laps
- Number of laps recorded
- Updates in real-time

2. Fastest Lap
- Shortest lap time
- Highlighted in green in lap list
- Shows your best performance

3. Slowest Lap
- Longest lap time
- Highlighted in red in lap list
- Identifies where you slowed down

4. Average Lap
- Mean of all lap times
- Helps gauge overall pace
- Useful for consistency tracking

Example statistics:
- 10 laps recorded
- Fastest: 2:25.30
- Slowest: 2:38.50
- Average: 2:30.15
- Consistency: 13.20 second spread

Why statistics matter:
- Track improvement over time
- Identify pacing issues
- Set realistic goals
- Monitor fatigue
- Optimize performance
- Compare workouts

Tips:
- Aim for consistent lap times
- Watch for progressive slowdown
- Use average as target pace
- Focus on reducing spread
- Record results for comparison

How to use fullscreen mode?

Fullscreen mode provides better visibility and focus:

How to enter fullscreen:
- Click the fullscreen button (top-right corner)
- Or press F key on your keyboard
- The stopwatch will expand to fill your entire screen

Fullscreen features:
- Larger time display (8x size)
- Bigger control buttons
- Distraction-free interface
- Perfect for presentations
- Great for group viewing
- Ideal for distant viewing

How to exit fullscreen:
- Click the fullscreen button again
- Press F key
- Press ESC key
- The stopwatch returns to normal size

When to use fullscreen:
- During workouts (hands-free viewing)
- In competitions (clear visibility)
- For presentations (audience can see)
- Group training sessions
- When timing from a distance
- Racing events
- Classroom demonstrations
- Sports practice

Fullscreen tips:
- All controls work in fullscreen
- Keyboard shortcuts still active
- Laps are recorded normally
- Statistics update in real-time
- Works on all devices
- Mobile-friendly
- Auto-adjusts for screen size

Compatibility:
- Desktop browsers: Full support
- Mobile browsers: Most supported
- Tablets: Excellent experience
- Smart TVs: Works great
- Fallback mode if API unavailable

Common uses for a stopwatch

Stopwatches are useful for many activities:

Sports & Fitness:
- Track running/jogging times
- Time interval training (HIIT)
- Measure workout rest periods
- Record swimming laps
- Time cycling segments
- Monitor sports practice drills
- Track yoga/meditation sessions
- Time stretching holds
- Racing competitions
- Sprint training

Cooking & Baking:
- Time multiple dishes simultaneously
- Track marinating times
- Monitor boiling/simmering
- Time rising/proofing
- Track steeping tea/coffee
- Follow recipe time steps
- Monitor food temperature checks

Study & Productivity:
- Pomodoro technique (25 min focus)
- Time study sessions
- Track task completion
- Measure reading speed
- Time practice tests
- Monitor break periods
- Track project time

Meetings & Presentations:
- Time presentation sections
- Monitor speaker time
- Track agenda items
- Control meeting length
- Time Q&A sessions
- Monitor break times

Gaming & Competitions:
- Speedrunning games
- Time puzzle solving
- Track game rounds
- Monitor turns
- Time challenges
- Record best times

Other uses:
- Time parking meters
- Track phone calls
- Monitor laundry cycles
- Time pet feeding intervals
- Track medication timing
- Monitor battery charging
- Time daily routines

Tips for accurate timing

Getting the most accurate results:

Before timing:
- Close unnecessary browser tabs
- Ensure stable internet (works offline)
- Position screen for easy viewing
- Familiarize with controls
- Test keyboard shortcuts
- Plan your lap points
- Consider using fullscreen mode

During timing:
- Click promptly at start/stop
- Use keyboard shortcuts for speed
- Record laps at consistent points
- Keep browser tab active
- Don't minimize window
- Avoid screen timeout
- Stay in fullscreen if needed

For best accuracy:
- Start button: ~50ms reaction time
- Keyboard shortcut: ~30ms faster
- Lap recording: Press L at exact moment
- Anticipate lap points
- Practice button timing

Accuracy limitations:
- Display updates every 10ms
- Human reaction time: 150-300ms
- Browser performance varies
- Screen refresh rate matters
- Background processes affect timing

Professional timing needs:
- For official competitions, use dedicated hardware
- This tool is perfect for:
* Personal training
* Casual timing
* General purpose use
* Practice sessions
* Non-competitive activities

Tips for consistency:
- Use same starting position
- Same lap recording method
- Same device/browser
- Same environment
- Record conditions (indoor/outdoor)
- Note any variables

Review results:
- Copy laps to spreadsheet
- Track trends over time
- Compare sessions
- Note improvements
- Set new goals

How is this different from a countdown timer?

Stopwatch vs Countdown Timer - key differences:

Stopwatch (this tool):
- Counts UP from zero
- Measures elapsed time
- Records lap/split times
- No end point
- Stop when you want
- Perfect for: timing activities, workouts, racing

Countdown Timer:
- Counts DOWN from set time
- Alerts when time expires
- Fixed duration
- Defined end point
- Stops automatically
- Perfect for: reminders, cooking, breaks

When to use stopwatch:
- You don't know how long activity will take
- Need to record multiple intervals
- Tracking performance/improvement
- Racing or competing
- Open-ended activities
- Measuring actual duration

When to use timer:
- Know exact duration needed
- Need reminder/alarm
- Following timed instructions
- Managing breaks
- Cooking with specific times
- Limiting activity duration

Example scenarios:

Use stopwatch for:
- "How long did my run take?"
- "What's my best lap time?"
- "How much time did I study?"
- "Track my workout intervals"

Use timer for:
- "Bake cake for 30 minutes"
- "Take 5-minute break"
- "Work for 25 minutes (Pomodoro)"
- "Steep tea for 3 minutes"

Many activities benefit from both:
- Workout: Timer for work periods, stopwatch for rest
- Cooking: Timer for oven, stopwatch for prep
- Study: Timer for sessions, stopwatch for tasks
- Sports: Timer for drills, stopwatch for runs

Choose based on:
- Do you need an alert? → Timer
- Do you need to measure? → Stopwatch
- Fixed duration? → Timer
- Open-ended? → Stopwatch
- Multiple intervals? → Stopwatch
- Single duration? → Timer

Key Features

• Precise timing to 10 milliseconds
• Unlimited lap recording
• Real-time lap statistics
• Fastest/slowest lap detection
• Lap time delta calculation
• Average lap time
• Fullscreen mode for better visibility
• Large display in fullscreen (8x size)
• Copy all results to clipboard
• Keyboard shortcuts (Space, L, R, F, ESC)
• Clean, distraction-free interface
• Large, easy-to-read display
• Responsive mobile design
• Dark mode support
• Works offline
• No ads or popups
• No registration required
• 100% free
• Privacy-friendly
• No data collection