Time Duration Calculator
Last updated: July 2026
Calculate elapsed hours and minutes between two times.
Elapsed time
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- Total minutes: —
- Decimal hours: —
On this page
Quick summary: Calculate elapsed hours and minutes between two times. Enter the requested values, calculate, review the result, and compare more than one realistic scenario before making a decision.
Read the complete guide
What this calculator does
The Time Duration Calculator measures elapsed time between two clock times or date-time values and can express the result in hours, minutes, and seconds.
How to use the calculator step by step
Enter the starting and ending time using the format requested by the page. Check whether the interval crosses midnight or spans multiple dates.
How the calculation works
The calculator converts both inputs to comparable time values and subtracts the starting instant from the ending instant.
Worked example and scenario testing
From 9:15 AM to 1:45 PM is 4 hours 30 minutes. If an interval begins at 11 PM and ends at 1 AM the next day, the duration is 2 hours rather than negative 22 hours.
How to interpret your result
The result represents elapsed time between the two inputs. It may differ from billable hours or working hours if breaks are excluded separately.
Accuracy, assumptions, and limitations
Time zones, daylight-saving changes, leap seconds, unpaid breaks, and overnight scheduling rules can require additional treatment.
Common mistakes to avoid
The most common errors are mixing 12-hour and 24-hour formats, forgetting AM or PM, or failing to account for crossing midnight.
Privacy and browser-based calculations
Only time values are needed. No schedule owner or identity information is required.