Time Duration Calculator
Calculate the total duration between a start and finish time, shown in hours and minutes, including durations that cross midnight.
Your results
Calculation breakdown
- Duration
- Finish time − start time (adds 24h if the finish time is earlier)
Worked example
Starting at 22:00 and finishing at 06:00 gives a duration of 8 hours, correctly crossing midnight.
Assumptions
- Uses 24-hour time; seconds are not modelled.
How this calculator works
Enter a start time and finish time to work out the total elapsed duration in hours and minutes. The calculator automatically handles finish times that fall after midnight, so it works for overnight shifts as well as same-day periods.
Frequently asked questions
Can I calculate a duration that crosses midnight?
Yes, if the finish time is earlier than the start time, the calculator assumes it falls on the following day.
What format should I use for times?
Use 24-hour time in HH:MM format, for example 09:30 or 22:15.
Does it round to the nearest minute?
Yes, results are shown to the nearest minute for readability.
Editorial review and responsibility
Reviewed by the CalcAussie editorial team on 21 September 2026. Review scope: Method, Australian terminology, material assumptions, source links and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.