Stopwatch
Precise stopwatch with lap times and split tracking
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Ready
Space start / pause · L lap · R reset
About this tool
Provides a precise stopwatch with lap time and split tracking - useful for timing workouts, races, presentations, or any activity where you need to measure elapsed time accurately, including intermediate lap times along the way.
How to use this tool
- Start timing sessionBegin elapsed-time tracking for activity, test, or event.
- Record laps or splitsCapture intermediate checkpoints without stopping total timer.
- Pause/resume as neededHandle breaks while preserving measurement continuity.
- Stop and review resultsAnalyze lap distribution and overall elapsed duration.
Lap times vs split times
A lap time is how long one segment took on its own - for example, each lap of a track. A split time is the total elapsed time at the moment you pressed the button. In a 4-lap run, the laps might be 1:32, 1:35, 1:33 and 1:30, while the splits are 1:32, 3:07, 4:40 and 6:10.
For interval training, press Lap at the end of each work and rest period so you can compare them afterwards.
Key features
- Accurate elapsed-time measurement with checkpoint support.
- Ideal for workouts, drills, and productivity timing.
- Lap and split tracking improves performance analysis.
- No setup required for fast timing needs.
Common uses
- Timing running laps and interval training.
- Measuring presentation and speaking duration.
- Tracking coding sprints or focus sessions.
- Benchmarking repeated process/task execution.
Tips for better results
- Label lap purpose in notes immediately after session.
- Use consistent start triggers when comparing runs.
- Pause only for true interruptions to keep data meaningful.
- Export or record results before resetting timer.
Mistakes to avoid
- Confusing split and lap metrics during analysis.
- Resetting timer before saving critical measurements.
- Starting late and treating inaccurate baseline as valid.
- Comparing sessions captured with different timing rules.
Frequently asked questions
Lap time measures the duration of each individual segment (like each lap of a race). Split time measures the cumulative total elapsed time at each checkpoint - both are useful depending on what you're trying to analyze.
Typically precise to fractions of a second, suitable for most timing needs from casual workouts to more serious performance tracking.
Yes - record as many laps as needed during a single stopwatch session without stopping the overall timer.
Elapsed time is measured from the start timestamp rather than by counting ticks, so it stays correct even when the browser slows a background tab. The display catches up as soon as you return.
Press lap at the end of each work and rest block. The lap list then shows each interval's length, so you can check that repeats stayed consistent through the session.
Yes. Start it as you begin and mark a lap at each section; the laps show where you ran long, which is the part to cut when rehearsing for a fixed slot.