About the Stopwatch
Start, stop and record laps with a precise online stopwatch. Lap and total times are shown side by side, and you can control it with the keyboard: Space, L for lap and R for reset.
Key features
- Accurate to 1/100 of a second
- Unlimited laps with lap and total times
- Fastest and slowest laps highlighted
- Keyboard shortcuts: Space, L and R
- Keeps exact time even in a background tab
- Large, easy-to-read display
A precise online stopwatch with laps
Time a run, a presentation, a cooking step, a game turn or a science experiment. Press Start, record laps as you go, and stop when you're done. Lap times show how long each segment took, with your fastest and slowest laps highlighted.
Keyboard shortcuts
| Key | Action |
|---|---|
| Space | Start / stop |
| L | Record a lap |
| R | Reset |
Common uses
- Running and swimming: lap splits for intervals and pace.
- Presentations and speeches: practice hitting your time slot.
- Productivity: time how long tasks really take.
- Classrooms: reaction-time games and physics experiments.
- Cooking: time steps when a countdown isn't needed.
Reading your laps
| Lap | Lap time | Total |
|---|---|---|
| 3 | 1:58.20 | 6:01.75 |
| 2 | 2:01.05 | 4:03.55 |
| 1 | 2:02.50 | 2:02.50 |
The newest lap is at the top. Green marks your fastest lap and red your slowest.
Stopwatch vs timer
A stopwatch counts up from zero to measure how long something takes. A timer counts down from a set time and alerts you when it ends. For countdowns, use the Online Timer.
Related tools
Count down with the Online Timer, calculate durations between clock times with the Time Duration Calculator, or count down to a date with the Countdown Timer.
How to use the Stopwatch
- Open the tool. It's ready to use immediately, with nothing to install.
- Enter your entries, numbers or settings, or keep the defaults.
- Press the main button (spin, roll, start or generate) and watch the result.
- Repeat as often as you like; results are generated fresh each time in your browser.