Stopwatch
Time anything to a tenth of a second, with lap splits you can copy out.
Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server.
How to use the stopwatch
- Press start.
- Press lap to record a split without stopping.
- Copy the laps when you are done.
About this tool
Start, pause, resume and lap, with each lap showing both its own split and the total elapsed time — the two figures runners and anyone timing repeated work actually need.
Elapsed time is taken from the clock rather than accumulated from intervals, so the reading is right even if the tab was in the background while it ran. Laps can be copied as a tab-separated list, which pastes straight into a spreadsheet.
Common uses
- Timing intervals in training.
- Measuring how long a task actually takes.
- Recording splits during a process.
Frequently asked questions
- How accurate is it?
- It reads a monotonic high-resolution clock and displays tenths. It is accurate enough for training and process timing, and not intended for official results.
- Are my laps saved?
- Only while the page is open. Copy or note them before you leave.
Related tools
Countdown Timer
Set a timer for any length, with presets, a progress bar and an alert when it finishes.
Pomodoro Timer
A focus timer that cycles between work sessions and breaks, with adjustable lengths.
Running Pace Calculator
Work out pace, finish time or distance for a run, with splits for common races.
Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks and years.