Time Duration Calculator
Calculate the duration between two times, with an optional break deduction.
How this calculator works
How to use this calculator
Select a start time and end time. Optionally enter a break time to subtract from the total duration, then calculate the result.
Formula used
The calculator converts the start and end times into minutes, subtracts the start from the end, and subtracts any break time. If the end time is earlier than the start time, the calculator treats it as crossing midnight.
Example calculation
From 9:00 AM to 5:30 PM is 8 hours 30 minutes. With a 30-minute break, the net duration is 8 hours.
What the result means
The result shows the total elapsed time after subtracting any break. Decimal hours are useful for work hours, billing, or timesheets.
Frequently asked questions
Does this handle overnight shifts?
Yes. If the end time is earlier than the start time, the calculator assumes the duration crosses midnight.
Can I subtract a lunch break?
Yes. Enter the break time in minutes or hours.
Is this a time zone calculator?
No. It calculates duration between times, not time zone differences.