Free · No sign-up · Millisecond accurate
Space start/pause · L lap · R reset
Press Start or hit Space to begin timing instantly.
Press Lap while running to record a split without stopping the clock.
Pause to stop the clock, Reset to clear everything and start fresh.
Timing is calculated from the real clock, so an accidental reload picks up exactly where you left off.
Your best and worst splits are highlighted automatically once you have two or more laps.
Space to start or pause, L to lap, R to reset — no reaching for the mouse mid-run.
It keeps running if you refresh — timing is calculated from the real clock, not a countdown, so reloading the page picks up exactly where it left off. Closing the tab entirely stops it, same as any browser-based timer.
It's accurate to the millisecond, calculated directly from your device's clock rather than counted in fixed intervals, so it doesn't drift even if the tab is in the background for a while.
Each lap records two numbers: the split (time since the previous lap) and the total elapsed time. Your fastest and slowest laps are highlighted automatically once you've recorded at least two.
Yes — press Space to start or pause, L to record a lap while running, and R to reset once paused.
Yes — laps make it easy to time reps, sets, or intervals. If you want a fixed countdown instead (like a rest timer), our Countdown Timer tool is a better fit.