Add and subtract HH:MM:SS durations line by line to get a total and its conversions
| Total (seconds) | 0 |
|---|---|
| Total (minutes) | 0 |
| Total (hours) | 0 |
| Valid lines | 0 |
| Average (HH:MM:SS) | 0:00:00 |
Write one duration per line. 1:23:45 is read as 1 hour 23 minutes 45 seconds, and 12:30 as 12 minutes 30 seconds. A line of digits with no colon (for example 90) is read as the unit selected above (seconds, minutes, or hours). A leading minus makes that line a subtraction. Blank lines and lines that cannot be read as a duration are ignored, and the number of ignored lines is shown below.
This tool handles elapsed durations rather than clock times, so the hours digit does not wrap at 24. A total of 30 hours is shown as 30:00:00. If the total is negative, it is shown with a leading minus sign.
Add up daily working hours to get a weekly total, stack up video clip lengths to check the total runtime, tally lap times or practice time, or sum estimated effort in hours. Records that mix minutes and seconds can be pasted in and totalled as they are.
Yes. Hours do not wrap at 24, so a total of 30 hours is shown as 30:00:00 exactly. Use it for sums that exceed a day, such as working hours or the total runtime of videos.
No. All calculation runs in your browser (JavaScript); your input is never sent to a server.
HH:MM:SS and MM:SS, plus digits-only lines such as 90. A digits-only line is read as seconds, minutes, or hours according to the unit you picked. A line with a leading minus is subtracted.