Time Duration and Hours Between Times Calculator
Works out the hours and minutes between two times on a 24-hour clock.
Duration
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
In decimal hours — hours
In minutes — minutes
In seconds — seconds
Reading this —
The formula
duration = end − start if the end is earlier, add 24 hours
Convert both times to minutes since midnight, subtract, and convert back.
What to watch out for
Borrow an hour when the end minutes are smaller: 17:10 minus 9:45 is 16:70 minus 9:45, or 7 hours 25 minutes.
Frequently Asked Questions
How many hours are there from 10 pm to 6 am?
8 hours: enter 22:00 and 06:00. An end time earlier than the start is taken as the next day.
How do I write 7 hours 30 minutes as a decimal?
Divide the minutes by 60 and add them to the hours: 7.50.