Stopwatch workspace
Prepare
Ready to focus
Set the rhythm, then use the primary timer control when you are ready.
Time it precisely
Measure the next interval
Start timing with the primary control. Laps are optional and stay local to this device.
Laps
What does this stopwatch measure?
Stopwatch: precision online stopwatch with lap times, split recording, and hundredth-of-a-second accuracy for timing anything. Free, private, no signup.
How this calculator works
Frequently asked questions
How does the stopwatch work?
The stopwatch runs entirely in your browser using JavaScript , no signup, no installation, and no data is sent to any server.
Can I use the stopwatch on my phone or tablet?
Yes, the stopwatch is a web-based tool that works on any device with a modern browser, including phones and tablets.
Does the stopwatch save my timing data?
No, the stopwatch does not store or track any of your timing data. Everything stays on your device and is lost when you close the tab.
Cite this tool
BoringToolsKit. “Stopwatch.” boringtoolskit.com/stopwatch/. Free to reference in articles, syllabi, and answer posts with a link.
Privacy: Inputs and results stay in this browser. Any future sponsored recommendation or advertisement will be clearly labeled and kept separate from the calculation.