OmniCalcsStopwatch
Start, pause and lap — measure time intervals to the hundredth of a second in your browser.
How to Use This Stopwatch
- Press Start to begin timing, and Pause to freeze the reading.
- Press Lap to record the current interval without stopping the clock.
- Reset clears the display and all recorded laps.
Frequently Asked Questions
How accurate is it?
It shows hundredths of a second and is suitable for most everyday timing. It is not certified for official sports records.
Does it keep running in the background?
Yes — elapsed time is computed from timestamps, so background throttling only affects how often the display refreshes.
What is a lap time?
The interval since the previous lap mark, useful for comparing splits of a race or task against each other.
Is any data sent anywhere?
No. Everything runs locally in your browser; nothing is recorded on a server.
Practical Example
Time three 400-meter laps and press Lap at the end of each. If the splits are 45.20 seconds, 50.40 seconds, and 40.00 seconds, the lap table shows those three lap times plus a running total of 135.60 seconds — 2 minutes 15.60 seconds (45.20 + 50.40 + 40.00 = 135.60).
- Each lap time measures the interval since the previous lap mark, so the splits can be compared against each other.
What Your Results Mean
- Lap time — the interval since the previous lap mark; press Lap again to start the next split.
- Total — the cumulative time since Start, shown beside each lap so you can verify the sum.
- Hundredths — precision to 0.01 seconds, suitable for everyday and hobby timing but not certified for official records.