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Free Online Stopwatch – Precise Millisecond Timing with Unlimited Laps
Free online stopwatch with millisecond precision and unlimited lap recording. Keyboard shortcuts: Space, L, R. Continues in background. No signup. Try now!
✅ 100% Free⚡ Instant Results🔒 No Signup📱 Mobile Friendly🔐 No Data Stored
Stopwatch
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Common Use Cases
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Athletic Training
Time running laps, swimming sets, cycling intervals, and workout circuits with millisecond accuracy.
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Productivity Tracking
Measure exactly how long individual tasks take to improve time estimates and find inefficiencies.
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Presentation Rehearsal
Time presentations, speeches, and pitches to ensure they fit within allotted time slots.
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Scientific Experiments
Record precise timing data for controlled experiments and reaction time tests.
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Cooking Timing
Track cooking steps with accurate timing when multiple recipe components have different cook times.
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Performance Testing
Manually benchmark code execution time and API response times during development.
Frequently Asked Questions
How accurate is the stopwatch?
Millisecond precision using the performance.now() API — more accurate than Date.now().
Does it work when I switch tabs?
Yes — timing continues in the background and the display updates correctly when you return.
Can I record lap times?
Yes — press L or click Lap to record unlimited split times with individual lap durations shown.
What are the keyboard shortcuts?
Space to start/pause, L to record a lap, and R to reset the timer and clear all lap records.
Is the stopwatch free?
Yes — completely free with no account or download required.