Stopwatch
A stopwatch with lap times, showing the elapsed time in seconds, minutes and hours at once.
Results
What this tool does
Start, pause and lap, with each lap showing both the time on the clock and the split since the previous one — which is the number that actually tells you whether you are speeding up or slowing down. The elapsed time is given in seconds, minutes and hours side by side, because a reading of 1:02:03 is useless the moment you need to multiply it by an hourly rate. Nothing is sent anywhere and nothing is stored.
Formula
formats the elapsed milliseconds as hours, minutes, seconds and hundredths
Variables
| Symbol | Meaning | Unit |
|---|---|---|
elapsed_ms | Milliseconds elapsed | — |
OUT | Time elapsed | — |
SC | Seconds | s |
MN | Minutes | min |
HR | Hours | h |
Worked example
- Milliseconds elapsed0
- Time elapsed0:00.00
- Seconds0.00 s
- Minutes0.0000 min
- Hours0.000000 h
Limitations
- The calculation runs entirely in your browser. The values you type are never sent to a server.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
Frequently asked questions
How accurate is it?
The time itself comes from the computer's clock and is accurate to the millisecond; the display refreshes about twenty times a second, which is why the hundredths appear to skip. What it cannot account for is your reaction time on the button, which is typically between 150 and 300 milliseconds and is far larger than any error in the clock. For anything that has to stand up to scrutiny, use equipment that triggers itself.