What is a Stopwatch?
A stopwatch is a time measurement tool that precisely measures elapsed time. It can measure time down to milliseconds (1/100th of a second) from the moment you press start until you stop. Unlike a timer that counts down from a set time to zero, a stopwatch starts from zero and measures time indefinitely.
- Start: Begin time measurement
- Pause: Temporarily stop measurement
- Resume: Continue from where you paused
- Reset: Return time to zero
- Lap: Record current time while continuing
How to Use the Stopwatch
Getting Started
Click the green 'Start' button to begin. Time is displayed in minutes:seconds.milliseconds format.
Recording Laps
Press 'Lap' while running to record split times. Useful for comparing different segments.
Pause & Resume
Use 'Pause' to stop and 'Resume' to continue measuring from where you left off.
Managing Records
Lap records are auto-saved. Export to Excel or delete individual entries.
Stopwatch Use Cases
Study & Focus
Track study time with Pomodoro technique (25 min work + 5 min break) or measure total daily study hours.
Sports & Fitness
Record workout times and lap splits for running, swimming, cycling. Perfect for interval training.
Game Speedruns
Measure game completion times and compare segment records. Challenge your personal best.
Cooking Timing
Perfect for precise cooking times - boiling pasta, grilling steaks, and more.
Work Productivity
Measure time spent on tasks to analyze and improve work efficiency.
Test & Competition Prep
Practice solving problems within time limits or rehearse presentations.
Frequently Asked Questions
What's the difference between a stopwatch and a timer?
A stopwatch starts from zero and measures elapsed time indefinitely, while a timer counts down from a set time to zero. Use a stopwatch for 'how long did it take' and a timer for 'how much time is left'.
Will my records be saved if I close the browser?
Lap records are automatically saved in your browser's local storage. You can access previous records when returning with the same browser. However, clearing browser data will also delete records.
Can I use it on mobile devices?
Yes, with responsive design it works optimally on smartphones, tablets, and PCs.
What's the maximum measurement time?
There's no time limit - measure indefinitely. Times over 1 hour are displayed in hours:minutes:seconds.milliseconds format.
Can I save lap records?
Yes, click 'Export Excel' to download all lap records as a CSV file. Open it in Excel or Google Sheets.
Privacy Notice
Stopwatch records are processed only in your browser and are not transmitted to any server. Lap records and settings are stored only in the browser's local storage, so there is no risk of your personal data being leaked.