Add & subtract durations
Enter hours, minutes and seconds in separate fields. Add durations or subtract breaks and see the total immediately. Files and entered content are not sent to or stored on a server.
How to use
Enter hours, minutes and seconds in separate fields. Add durations or subtract breaks and see the total immediately.
Please note
Hours support 0–23 and minutes and seconds support 0–59 as whole numbers. Empty fields count as zero; up to 100 entries are supported.
Add & subtract durations User guide
Instructions
- Enter hours, minutes and seconds for each entry.
- Choose Add or Subtract. Use Add time when you need another entry.
- The total updates immediately. Copy it if needed or use Clear to start over.
Example
Input / settings
Add 1 h 30 m · add 45 m 30 s · subtract 10 m
Result / checks
2 h 5 m 30 s
Please note
- Hours support 0–23 and minutes and seconds support 0–59 as whole numbers. Empty fields count as zero; up to 100 entries are supported.
- Totals above 24 hours are displayed as days and hours. Entries are saved only in this browser; Clear removes them.