Stopwatch
Record elapsed time, lab sections, and cumulative time per lab. Save up to 200 labs as CSV, excluding pause times.
Elapsed time
Waiting
Records are lost when refreshing or navigating pages. Sounds may be delayed or absent during screen lock or background mode.
Lab recording
No records yet.
Share result
Share the tool link and result text together. No URL is included in the result. Check the below content and then share it.
How to use and criteria
A tool to create elapsed time and lap intervals with cumulative records using start and stop times.
Actual example
After 12.34 seconds, the first lap is recorded, and at 20.00 seconds, the second lap is recorded. Thus, the intervals are 12.34 seconds and 7.66 seconds, with the total time being 12.34 seconds and 20.00 seconds.
Changing the device time may affect the measurement values. Due to browser shutdown, power saving, and notification restrictions, use the device alarm for important appointments.
Frequently Asked Questions
How is lab time different from cumulative time?
The lab interval is the measurement time after the previous lab. Cumulative time is the total time from the first start excluding pauses. Up to 200 labs can be recorded.
Does the second decimal place on the screen ensure precise measurement?
Displayed in 1/100 seconds, but affected by screen refresh, input delay, and device visual changes. It does not replace professional competitions or equipment measurements. The maximum duration is 7 days.
When was the shared content in the CSV?
This is a snapshot of the moment when the ‘Create Current Record’ button was pressed. Create a new record if you want to reflect lap and time later. Save the file before navigating or refreshing the page.
Calculation criteria and reference materials
- MDN — Background tab time handling
Refreshing the screen for hidden tabs and timer limits. No guarantee for notifications like device alarms.
Verification of calculation criteria: · Calculation·verification principles · Report errors