Enter a start time and an end time (in 24-hour format) to instantly calculate the duration between them. Get the result in hours and minutes, total minutes, decimal hours, and total seconds. If the end time is earlier than the start time, the calculator assumes the period crosses midnight (overnight duration).
Yes. If the end time is earlier than the start time (e.g., 22:00 to 06:00), the calculator automatically adds 24 hours to compute the overnight duration (8 hours in this case).
Decimal hours are useful for billing, timesheets, and payroll calculations. For example, 8 hours 30 minutes = 8.5 hours. Multiply by your hourly rate to get total pay.
Formula: Total minutes = (End hours × 60 + End minutes) − (Start hours × 60 + Start minutes). If result < 0, add 1440 (24×60) for overnight spans. Hours = floor(total / 60) | Remaining minutes = total % 60.
Example: Start: 09:00, End: 17:30 → Duration: 8 hours 30 minutes | Total: 510 minutes | 8.5 hours | 30,600 seconds.
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