Online stopwatch

Press Start to begin timing. Lap records a split: the table shows each lap's own time and the running total, and marks the fastest and slowest laps once you have two or more.

Copy laps copies the table as plain text, one lap per line, ready to paste into a spreadsheet, a message or your training notes.

Fullscreen shows large digits for a classroom, gym or sports session. While the stopwatch runs we ask your device to keep the screen on, where it supports that.

Accuracy: the stopwatch reads the clock rather than counting ticks, so the time stays right if you switch tabs or lock your phone briefly. It shows hundredths of a second; for official race timing use dedicated equipment.