Time Duration Calculator
Find the hours and minutes between any two times — including across midnight.
Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026
Duration
8h 30m
Total minutes
510
What is a time duration calculator?
A time duration calculator works out how much time passes between a start time and an end time, shown in hours and minutes (and total minutes). It is useful for timesheets, shifts, cooking and travel.
How it works
The tool converts both times to minutes since midnight, subtracts the start from the end, and converts the result back to hours and minutes. If the end time is earlier than the start, it treats the span as crossing midnight. Example: 09:00 to 17:30 is 8 hours 30 minutes, or 510 minutes.
All calculations happen in your browser. Nothing is sent, stored, or tracked.
Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer
How to use
Enter a start time and an end time in 24-hour format (HH:MM). The duration is shown in hours and minutes, plus the total in minutes.
If the end time is earlier than the start time, the calculator assumes the end is on the following day. That makes it perfect for night shifts, overnight travel, or any interval that crosses midnight.