Time Duration Calculator
Calculate the exact duration between two times in hours, minutes, and seconds. Supports overnight ranges that cross midnight.
Time range
Duration
8:30:00
8 hours, 30 minutes, 0 seconds.
Total seconds
30,600
Total minutes
510
Total hours
8.5
Frequently Asked Questions about the Time Duration Calculator
How do I calculate the duration between two times?
Enter your start time and end time. The calculator returns the duration in hours, minutes, and seconds, plus the total in each unit.
What does the crosses midnight option do?
Tick it when your end time falls on the next day, for example a night shift from 22:00 to 06:00. The calculator then adds 24 hours so the duration stays positive.
Why does the calculator show nothing when my end time is earlier than my start time?
Without the midnight option, an earlier end time produces a negative duration. Tick crosses midnight or swap your inputs.
Can I use seconds in the input?
Yes. The time inputs accept HH:MM:SS, so you can measure precise stopwatch ranges down to the second.
What is the difference between total minutes and the H:MM:SS result?
The H:MM:SS format splits the duration into hours, minutes, and seconds. Total minutes expresses the same duration as a single decimal number, useful for billing or spreadsheets.