Clock arithmetic
Add Hours to a Time
Add a duration to a clock time and get the resulting time of day.
Clock result11:30Added 2 hr 30 min
How this calculator works
The duration is converted to minutes, added to the starting time, then wrapped into a 24-hour clock result.
The tool is arithmetic only. Where legal, payroll, holiday, timezone or jurisdiction-specific rules matter, the page states what is and is not included.
Frequently asked questions
What happens if the result passes midnight?
The clock wraps to the next day, such as 23:00 plus 3 hours = 02:00.