Logo

Stopwatch

Precision stopwatch with lap timing and split tracking

00:00.00

Related Tools

Batch Timestamp Converter

Convert multiple Unix timestamps to human-readable dates simultaneously

Week Number Calculator

Check the current week number or find the week number for any date

World Clock

View current time in multiple cities and time zones around the world

Timestamp Converter

Convert between UNIX timestamps and readable dates with timezone-aware conversions, batch processing, and natural language parsing

Time Zone Converter

Convert time between multiple time zones with ease and precision

Countdown Timer

Create countdown timers for events, deadlines, and time-sensitive tasks

Online Precision Stopwatch

A high-precision online stopwatch capable of measuring time intervals to the nearest 10 milliseconds (1/100th of a second). Whether you're tracking athletic performance, timing scientific experiments, or simply measuring how long a task takes, this tool provides accurate, reliable timing directly in your browser.

Features include splits/lap timing, pause/resume functionality, and automatic "best lap" highlighting to help you analyze performance at a glance.

⏱️ Professional Features

  • Split Timing: Record unlimited lap times without stopping the main timer.
  • Performance Analysis: Automatically highlights your fastest (green) and slowest (red) laps.
  • Centisecond Precision: Measures down to 0.01s for competitive accuracy.

Perfect For...

🏃 Sports & Fitness

Track interval training, sprint times, or rest periods between sets.

🍳 Cooking & Brewing

Time precise steep times for coffee, tea, or critical cooking steps.

💼 Productivity

Measure exactly how long specific work tasks take to improve estimation.

How to Use Lap Timing

  1. Start the Timer: Click the Start button to begin.
  2. Record a Lap: Press Lap whenever you complete a circuit or segment. The timer continues running.
  3. Review: The lap list below updates instantly. The delta time (difference) between laps is calculated automatically.
  4. Analyze: Look for the green row to see your personal best for this session.

Frequently Asked Questions

How accurate is this stopwatch? ▼
Browser-based stopwatches are generally accurate to within a few milliseconds. However, they depend on your device's system clock. For Olympic-level timing, specialized hardware requires less than 0.001s variance, but for 99% of human uses (sports, cooking, work), this tool is perfectly accurate.
Will it run in the background? ▼
Yes! The stopwatch calculates time based on the system clock difference, not just by counting ticks. This means if you switch tabs or minimize the window, the time will still be correct when you return.
Does it work offline? ▼
Once loaded, the tool runs entirely in your browser using JavaScript. You do not need an active internet connection to use it.