Online Stopwatch & Timer
Free online stopwatch and countdown timer. Track time with lap functionality, millisecond precision, and fullscreen mode.
How to Use the Online Stopwatch
Click Start to begin timing. Use the Lap button to record split times without stopping the clock. Click Stop to pause, and Reset to clear. The stopwatch tracks time down to millisecond precision.
Countdown Timer
Switch to Timer mode, set your desired duration using the input fields or quick presets, and click Start. The timer counts down and alerts you when time is up. Great for cooking, workouts, study sessions, and presentations.
When to Use a Stopwatch vs Timer
Use a stopwatch when you want to measure how long something takes — running laps, cooking times, or work tasks. Use a countdown timer when you know the duration in advance and need an alert when time expires — exam time limits, break reminders, or game rounds.