Time Addition/Subtraction Calculator
Add or subtract hours, minutes, and seconds.
Useful for timesheets, project tracking, and cooking timers.
Result
Time Addition/Subtraction handles the base-60 math of hours, minutes, and seconds.
How it works:
- Convert everything to total seconds
- Add or subtract
- Convert back to hours:minutes:seconds
Conversion:
- 1 hour = 60 minutes = 3,600 seconds
Total seconds = (hours × 3600) + (minutes × 60) + seconds
Examples:
- 2:45:30 + 1:30:45 = 4:16:15
- 8:00:00 − 5:15:30 = 2:44:30
Practical uses:
- Adding up timesheet hours
- Calculating total recipe/cooking time
- Combining workout intervals