Online Stopwatch - Lap Times & Precision
Precise online stopwatch with lap times. Start, stop, and reset with one click. Free, works in any browser - no install needed.
00:00.00
Online Stopwatch - Lap Times & Split Timer
A precise stopwatch that runs directly in your browser. Use it for sports timing, cooking, presentations, or any activity that needs accurate time measurement. The lap feature lets you record split times without stopping the clock.
The stopwatch displays hours, minutes, seconds, and milliseconds. Record unlimited lap times while the main timer continues running. Each lap shows both the individual split time and the cumulative total, making it easy to compare segments.
Browser-based stopwatches use the high-resolution performance timer API, which provides sub-millisecond accuracy independent of the system clock. However, background tabs may be throttled by the browser to save resources - keep the tab in the foreground for the most consistent timing.
For interval training, use the lap feature to record each set or rest period. Coaches can time multiple athletes by starting the stopwatch once and recording laps for each runner as they pass. The split-time view makes it easy to identify which interval was fastest or slowest.
If you need a countdown timer instead, check our Timer tool. For measuring meeting duration and calculating its cost, our Meeting Cost Calculator combines elapsed time with participant costs.
How the Stopwatch Works
- 01Click Start to begin timing
- 02Use the Lap button to record split times without stopping
- 03Pause and resume at any point
- 04Reset to clear all recorded times
Using Lap Times Effectively
Lap times let you measure individual segments within a longer activity - useful for interval training, cooking steps, or presentations. Each lap records both the split time (since last lap) and the total elapsed time. For best accuracy, use a stable browser tab - background tabs may throttle timers. This stopwatch runs entirely in your browser with millisecond precision.
When to Use the Stopwatch
Use this stopwatch for sports timing (running splits, swim laps, workout intervals), cooking (timing recipe steps that need precision), presentations (tracking speaking time per section), testing (measuring task completion times for usability studies), and any activity where you need to measure elapsed time with split tracking.
Common Use Cases
- Time running intervals and rest periods during workouts
- Record lap times for swimming, cycling, or track training
- Time cooking steps that require precise durations
- Measure speaking time for presentation rehearsals
- Track task completion times for productivity analysis and usability testing
Expert Tips
- Use the lap feature for interval training - record each work and rest period to analyze your pace consistency.
- Keep the stopwatch tab in the foreground for the most consistent display updates. Background tabs may show slightly delayed visual updates.
- For presentations, set target times per section and use laps to track when you move to the next section - this helps you stay on schedule.
- Compare split times across sessions to track improvement. Copy your lap times to a spreadsheet for trend analysis over weeks or months.
Frequently Asked Questions
How accurate is a browser-based stopwatch?→
Will the timer stop if I switch tabs?→
Can I save my lap times?→
What is the difference between split time and lap time?→
Related tools
12 suggested- 01Pomodoro Timer - Free Online Focus TimerStay focused with the Pomodoro technique. 25 min work, 5 min break cycles with notifications. Free online timer, no install needed.
- 02Countdown Timer - Live Event Countdown ClockSet a target date and time to see a live countdown with animated flip-clock display. Add an event name, share the link, or go full screen for presentations.
- 03Study Timer - Pomodoro Focus SessionsTimed study sessions with 25/5 and 50/10 presets, breaks, a daily session counter, and a tab title countdown. Free and browser-based.
- 04Military Time Converter - 24-Hour and 12-Hour TimeConvert between AM/PM and 24-hour military time in both directions, with a full reference chart and spoken phrases. Free, instant, browser-based.
- 05Weekly Planner - Free Printable Week SchedulePlan your whole week in a live 7-day grid with your own time slots, then print it or export a CSV. Free, saved in your browser.
- 06Meal Planner - Weekly Meal Plan & Grocery ListPlan breakfast, lunch, dinner, and snacks for the week and get an automatic grocery list from your ingredients. Free, browser-based, print or export.
- 07Study Planner - Free Revision TimetablePlan revision by subject and exam date, track hours and progress, and export to CSV or Excel. Free and saved in your browser.
- 08Ovulation Calculator - Fertile Window, FreeFree browser-based ovulation calculator showing your fertile window, ovulation day, and next period across three cycles from two simple inputs.
- 09Due Date Calculator - Pregnancy Timeline, FreeFree browser-based due date calculator from last period or conception date, showing gestational age, trimester, and key pregnancy milestone dates.
- 10Date Calculator - Add Days & Find DifferencesCalculate the difference between two dates or add/subtract days from any date. Shows years, months, and days. Free online tool.
- 11Date Difference Calculator - Days BetweenCalculate the exact difference between two dates in years, months, days, weeks, and hours. Includes countdown feature. Free online tool.
- 12Age Calculator - Exact Years, Months & DaysCalculate your exact age in years, months, and days from your date of birth. See total days alive and next birthday countdown.
Link to this tool
Free to use, free to linkMentioning this tool in a README, a blog post or your team wiki? Paste one of these and your readers land straight on the tool, running in their own browser.
- HTML
<a href="https://toolforte.com/tools/stopwatch">Online Stopwatch</a> - MD
[Online Stopwatch](https://toolforte.com/tools/stopwatch)