Overview
Split and lap timing explained for runners, swimmers, and anyone tracking performance segments.
Hit the lap button at the split you care about, such as each 400 meters, and write the number down before you refresh.
How to use it
- Open Online Stopwatch.
- Press start at the gun, whistle, or first step, and mark a lap at each split you care about.
- Keep Lap Stopwatch or Online Timer for a second phase.
Good to know
Laps stay in this browser. Clearing site data removes them, and a closed tab stops the count.
The tools are free on the TimerClock home page. Settings stay in this browser. The privacy policy explains what is stored.
Frequently asked questions
What is this guide for?
Split and lap timing explained for runners, swimmers, and anyone tracking performance segments.
Which TimerClock page should I open?
Start with Online Stopwatch. Use Lap Stopwatch when you want a closer variation.
Do laps save after I refresh?
Treat a refresh as a new session. Write down any split you need to keep before you leave the page.
Can I use this beside a countdown?
Yes. Use the stopwatch for elapsed time and a separate timer if you also need a fixed end point.
When was this guide updated?
October 2, 2026. The steps match the tools linked on this page.