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Sub Millisecond High Precision High Resolution Performance Timers

Sub millisecond high precision high resolution performance timers comes up constantly for people who just need the job done correctly the first time. Here's the free Online Stopwatch & Lap Timer that handles it, plus what to watch out for.

🚀 Quick-Start Guide

Log your first entry above. Add more entries as they happen. Watch your running total and average update automatically.

Common Scenarios & Troubleshooting

This tool is built for the moment you need a quick, accurate answer without opening a spreadsheet.

Note on errors: the most common slip-up here is an off-by-one date or a typo in a number that throws off the whole result. If that happens, double-check your input rather than the tool — the calculation itself runs the same way every time.

Your data stays private. Everything you type runs locally in your own browser tab. Nothing is uploaded, logged, or stored on a server — close the tab and it's gone.

Behind the Scenes: The Processing Logic

This tool processes everything client-side, inside your browser window, using a simple running array held in memory for the length of your session. Lap capture tracking boards; pause control triggers; CSV export buttons Nothing is sent to a server, so there's no upload delay and no privacy trade-off.