Time Duration Calculator
Add or subtract hours, minutes, and seconds, calculate time elapsed between two times, and convert decimal hours.
Start and End Times
Elapsed Duration
8 hrs 30 mins
510 total minutes · 8.50 decimal hours
Total Minutes
510
Decimal Hours
8.50 hrs
How it works
The Time Duration Calculator calculates the time elapsed between two clock times, adds and subtracts hours and minutes, and converts decimal hours.
Elapsed time handles schedules that span across midnight automatically (for example, starting at 10:00 PM and ending at 6:30 AM).
The decimal converter translates fractional hours (like 7.75 hours on a timesheet or payroll stub) into exact hours and minutes (7 hours and 45 minutes).
Useful for tracking work hours, flight durations, workout intervals, and sleep cycles.
Frequently asked questions
- How do I convert decimal hours to minutes?
- Multiply the decimal portion by 60. For example, 0.75 hours * 60 = 45 minutes, so 8.75 hours equals 8 hours and 45 minutes.
- Can this calculate overnight work shifts?
- Yes. If the end time is earlier than the start time, the calculator automatically accounts for the overnight rollover past midnight.
- How do I add multiple hours and minutes together?
- Use the 'Add / Subtract Times' tab to combine hours and minutes into an accumulated total.
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