Time Duration Calculator
Find the elapsed time between a start and end time in hours, minutes and decimal hours.
Start time
End time
8h 30m
8
30
8.5
510
Formula
Examples
| Input | Result |
|---|---|
| 09:00 to 17:30 | 8h 30m = 8.5 hours |
| 22:00 to 06:00 (overnight) | 8h 0m = 8.0 hours |
About this calculator
The time duration calculator measures how much time passes between a start time and an end time. Enter both in 24-hour HH:MM format. The result is shown in hours and minutes, as a decimal number of hours, and as a total number of minutes.
If the end time is earlier than the start time, the calculator assumes the span crosses midnight and adds 24 hours, which is convenient for overnight shifts or events that run past midnight. For pay calculations that also subtract breaks, use the Work Hours Calculator.
Frequently asked questions
If the end time is earlier than the start time, it assumes the end is on the following day and adds 24 hours, so 22:00 to 06:00 returns 8 hours.
Decimal hours expresses the duration as a single number, so 8 hours 30 minutes becomes 8.5 hours. It is useful for timesheets and billing.
Use 24-hour HH:MM, for example 13:45. The time picker on your device will format this automatically.
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