How to use this calculator
- 1
Choose a time-only interval or a date-and-time interval.
- 2
Enter both endpoints. For time-only overnight intervals, select “Ends next day”.
- 3
Read the duration in days, hours, minutes, and decimal hours.
The calculation, explained
Wall-clock minutes = calendar day difference × 1,440 + end clock minutes − start clock minutes.
A QUICK EXAMPLE
January 5 at 09:00 to January 6 at 11:30
1 day 2 hours 30 minutes · 26.50 hoursFrequently asked questions
Does this calculate elapsed time across a clock change?+
This tool calculates wall-clock duration. It does not apply a time zone or daylight saving transition. For actual elapsed time across a clock change, use timestamps with explicit UTC offsets instead.
What is the difference from Work Hours?+
Time Duration measures the whole interval without deducting breaks. Work Hours subtracts unpaid breaks and is designed for individual shifts.