Enter a start time and end time to find the elapsed time between them. The calculator returns the duration broken down into hours, minutes, and seconds, plus the total elapsed time expressed in each unit individually. Works across midnight when end time is earlier than start time. Also try the use the 45 Day Calculator.
Elapsed Time
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Total Hours
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Total Minutes
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Total Seconds
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Elapsed time is the total amount of time that passes between a start event and an end event. For example, if you start working at 9:00 AM and finish at 5:30 PM, the elapsed time is 8 hours and 30 minutes. It measures duration, not the clock time itself. See also our find Total Duration (HH:MM:SS) with Time Adder Calculator.
Convert both times to 24-hour format (or total minutes/seconds since midnight), then subtract the start time from the end time. The result gives you the duration. If the end time is earlier than the start time, the duration crosses midnight — add 24 hours to the end time before subtracting.
From 3:40 AM to 2:00 PM is 10 hours and 20 minutes. Converting to 24-hour format: 3:40 to 14:00. Subtracting 3h 40m from 14h 00m gives 10h 20m, or 620 minutes total.
Yes. Select 'Yes — crosses midnight' from the Overnight option to indicate the end time falls on the next day. The calculator will automatically add 24 hours to account for the overnight span, giving you the correct elapsed duration. You might also find our Working Days Calculator useful.
Enter the known start time and end time into the respective fields. The calculator will display the elapsed duration in hours, minutes, and seconds. If you only know the start time and a duration, you can work backward by adding the duration to the start time manually or using a time addition calculator.
The 12-hour format uses AM and PM to distinguish morning (12:00 AM to 11:59 AM) from afternoon and evening (12:00 PM to 11:59 PM). The 24-hour format runs from 00:00 (midnight) to 23:59, eliminating ambiguity. For example, 3:00 PM in 24-hour time is 15:00.
A negative result usually means the end time is earlier than the start time on the same day, which indicates an overnight duration. Enable the 'Spans Overnight' option so the calculator adds 24 hours to correctly compute the elapsed time across midnight.
This calculator is optimized for durations within a single day or crossing one midnight boundary. For multi-day durations, use a date and time duration calculator that lets you input full dates alongside the times for accurate results. Check out our Date to Date (with Time) Calculator as well.