Free Online Stopwatch
A clean, millisecond-accurate digital stopwatch with split times, lap recording, keyboard shortcuts, and full-screen mode. 100% ad-free.
How to Audit Task Duration & Pacing
Accurate time tracking dismantles the planning fallacy. Follow these 3 steps:
Start with Spacebar
Hit Space the moment you begin a sprint or exercise. No mouse required.
Record Milestone Laps
Press L at each milestone to log splits. Compare your fastest and slowest intervals automatically.
Export & Benchmark
Copy your lap table with 1-click to paste into your dev notes, workout log, or project sprint retro.
"Kahneman and Tversky demonstrated that humans consistently underestimate task completion times by 30–50%. Measuring elapsed duration with a precise stopwatch replaces optimistic bias with objective empirical data, accelerating productivity calibrations."
Popular Stopwatch Use Cases
From cognitive sprint tracking to fitness intervals:
Task & Bug Triage Audits
Time how long code reviews, customer tickets, and PR triage actually take to budget your work day realistically.
Speeches & Pitch Rehearsals
Keep elevator pitches under 60 seconds and rehearse conference presentations with split times per slide.
Athletic Drills & HIIT Laps
Track sprint intervals, plank holds, swim laps, and rest pauses with millisecond accuracy.
Speed Reading & Exam Timing
Benchmark words-per-minute comprehension and practice speed runs on standardized test sections.
Frequently Asked Questions
How accurate is this online stopwatch?
It uses high-resolution browser timing (performance.now()) with millisecond accuracy, ensuring zero clock drift even during extended recording sessions.