Time Duration Calculator
Add or subtract hours, minutes, and seconds across multiple entries.
About This Tool
Free time duration calculator online — add or subtract two time durations (in hours, minutes, and seconds), or add multiple duration entries together to get a total. Enter durations like "2h 30m" and "1h 45m" and instantly see the sum or difference in a clean HH:MM:SS format, along with the total in decimal hours and total minutes. Useful for totaling work hours from multiple time entries, calculating overtime, adding up video or audio clip lengths, estimating combined task durations for project planning, and payroll time-sheet calculations. All math runs instantly in your browser as you edit any value.
How to Use
- 1
Enter your time durations
Type each duration as hours, minutes, and seconds — add more rows as needed.
- 2
Choose add or subtract
Select whether to sum all durations or subtract one from another.
- 3
Read the total
See the result in HH:MM:SS format, plus total minutes and decimal hours.