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Time Duration Calculator

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).

Frequently Asked Questions

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.

How this calculator works

Formula explanation

**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.