Add Time Durations
DATES & TIME
Add Time Durations
Add clock-style durations without wrapping at 24 hours.
UNDERSTAND YOUR RESULT
How it works
Add clock-style durations without wrapping at 24 hours.
THE CALCULATIONsum H:MM or H:MM:SS entries
Using this calculator
Enter one duration per line. sum H:MM or H:MM:SS entries.
What to keep in mind
Gregorian calendar, years 1900–9999. Calendar dates use UTC to avoid daylight-saving shifts. Business days mean Monday–Friday; holidays are not excluded.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.