Time Duration Calculator
Free online Time Duration Calculator. Simple, fast, and secure tool running in your browser.
What is the Time Duration Calculator?
Figuring out the exact difference between a start time and an end time can be surprisingly frustrating, especially when crossing the 12-hour mark or calculating overnight shifts. Stop manually counting on your fingers!
Our Time Duration Calculator instantly computes the exact hours, minutes, and seconds between any two time inputs. Whether you are logging billable hours, checking your sleep cycle, or tracking a flight duration, this tool guarantees mathematical accuracy every single time.
How to Use the Time Difference Calculator
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1
Set Start Time
Input the Starting Time (select your hour, minute, and AM/PM format).
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2
Set End Time
Input the Ending Time.
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3
Calculate Duration
Click the calculate button to instantly view the distinct total time difference formatted in hours and minutes.
💡 Pro Tips for Best Results
- • If you are calculating a duration that passes midnight, simply ensure your AM/PM descriptors are correctly assigned—the tool automatically handles overnight logic.
- • Use the 24-hour mode toggle for military time or aviation logging to streamline your input process.
Frequently Asked Questions
Does this account for overnight calculations?
Yes. If you enter a start time of 10:00 PM and an end time of 6:00 AM, the calculator correctly identifies the duration as 8 hours.
What is military time?
Military time uses a 24-hour clock system (e.g., 14:00 instead of 2:00 PM), eliminating the need for AM/PM indicators and preventing scheduling errors.
How do I convert minutes to decimals for payroll?
Divide the minutes by 60. For example, 45 minutes / 60 = 0.75 hours.