Add up multiple time durations
Add up a list of HH:MM:SS durations, or find the difference between two, and get the total in hours, minutes, and seconds.
Calculated in your browser. Nothing you enter is sent to a server.
Fullscreen
Durations (H : M : S)
::
::
Total
00:00:00
Row 1: 00:00:00Row 2: 00:00:00
0.00 decimal hours · 0 seconds
Calculated in your browser. Nothing is sent anywhere.
01
Choose a mode
Sum a list of durations, or find the difference between two.
02
Enter hours, minutes, and seconds
Add as many rows as you need in sum mode, or fill in both durations in difference mode.
03
Read the total
Get the result as H:MM:SS, plus decimal hours and total seconds.
Frequently asked
Can I add more than two durations?
Yes, in "Sum a list" mode you can add as many rows as you need with the "Add duration" button.
What happens if duration B is longer than duration A in difference mode?
The calculator still shows a positive result, computed as B minus A, and notes that the values were effectively swapped.
What's 'decimal hours' useful for?
It's the same total expressed as a single decimal number (e.g. 2.50 instead of 2:30:00), which is handy for timesheets or billing spreadsheets.