Time Difference Calculator
About Time Difference Calculator
What Is a Time Difference Calculator?
A time difference calculator computes the exact duration between two times. Enter a start time and an end time to find out how many hours, minutes, and seconds have elapsed. This is useful for tracking work hours, calculating billable time, measuring cooking durations, timing exercise routines, and computing shift lengths. The calculator supports both 12-hour (AM/PM) and 24-hour formats and handles overnight spans correctly.
How It Works
The calculator converts both times to minutes (or seconds) from midnight, subtracts the start from the end, and converts back to hours, minutes, and seconds. If the end time is earlier than the start time, it assumes the duration crosses midnight and adds 24 hours accordingly. The result is displayed in multiple formats: hours and minutes, total minutes, total seconds, and as a decimal (e.g., 2.5 hours).
How to Use This Calculator
Enter the start time and end time using the time inputs. Click Calculate to see the duration. Use the format toggle to switch between AM/PM and 24-hour input modes. Results show the difference in multiple units.
Frequently Asked Questions
What if the end time is before the start time?
The calculator assumes the time span crosses midnight. For example, 10:00 PM to 6:00 AM calculates as 8 hours.
Can I calculate more than 24 hours?
This calculator is designed for durations within a single day or overnight. For multi-day durations, use the Date Difference Calculator which handles both date and time.
What is decimal time?
Decimal time expresses hours as a decimal number. 1 hour 30 minutes = 1.5 hours. This format is commonly used for billing and payroll calculations.
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