Calculate hours worked
From 09:00 to 17:30 is 8 hours 30 minutes. Subtract a 30-minute break to get 8 hours, or 8.0 decimal hours. Enter the break in minutes, not as a decimal fraction of an hour.
Time Duration Calculator
Find elapsed hours and minutes for a shift, a task, or a trip. Subtract a break and choose whether the end time is the next day.
Time Duration Calculator
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How to use this calculator
Cross midnight explicitly
For a 22:00 start and 06:00 finish, choose “Next day.” That gives 8 hours before breaks. With “Same day,” an end time before the start is rejected instead of silently assuming an overnight shift.
Understand decimal hours
Minutes are fractions of 60. Seven hours 30 minutes is 7.5 decimal hours; seven hours 15 minutes is 7.25. The result shows both a hours-and-minutes reading and decimal hours for easier comparison.
Keep clock time separate from real elapsed time
This tool uses clock times and the selected day offset. It does not adjust for travel across time zones or daylight-saving transitions. For a shift affected by a clock change, confirm the actual timestamps and applicable payroll rules separately.
A LITTLE MORE CLARITY
Common questions
What does the same start and end time mean?
On the same day it means zero elapsed time. If you select “Next day,” it means 24 hours before breaks.
Can a break exceed the duration?
No. A break longer than the elapsed interval is rejected. A break equal to the duration leaves zero net time.
About this tool
Created by Marchelle Cook at Roof & Ratio. These calculations run in your browser; entered values are not uploaded or saved by the calculator. Report a calculation issue with an example so we can review it.
Guide updated October 23, 2026. Displayed decimal results may be rounded; exact fraction and integer results are identified in the answer.