Working out hours worked, a schedule gap, or what time something ends after adding a duration is easy to fumble doing it in your head. This tool handles both directions — the duration between two times, or adding/subtracting time from a starting point — instantly.
How to use the time duration calculator tool
- 1
Pick a mode
Find the duration between two times, or add/subtract time from a starting point.
- 2
Enter your times
Use the time pickers to set start/end times, or a starting time plus hours and minutes.
- 3
Read the result
The duration or resulting time updates instantly.
Common use cases
Calculate hours worked
Find the duration between a clock-in and clock-out time.
Plan a schedule
Add a duration to a start time to find when something ends.
Work out a meeting's length
Find the exact duration between a meeting's start and end time.
Frequently asked questions
In "time difference" mode, the calculator assumes the end time falls on the next day — useful for overnight shifts.