Work Hours Calculator
Total one shift after an unpaid break.
Example · 9h 30m − 1h break = 8h 30m
Time Duration Calculator
Find the time between a start and an end clock time, including shifts that end the next day.
Your entries stay in this browser
This calculator uses nominal clock time and does not adjust for daylight saving changes. See calculation methodology
How to use it
- Input
- 8:15 AM → 5:45 PM
- Calculation
- 5:45 PM − 8:15 AM
- Result
- 9h 30m
- Input
- 10:30 PM → 6:15 AM, Ends next day
- Calculation
- (24h − 10:30 PM) + 6:15 AM
- Result
- 7h 45m
- Enter the start time.
- Enter the end time.
- Turn on “Ends next day” if the end time is after midnight.
- Select Calculate.
How it works
Clock times are converted to minutes after midnight. Without “Ends next day”, the duration is the end minus the start, and an end earlier than the start is an error, never a guess.
With “Ends next day”, the time until midnight is added to the time after midnight. Equal times give 0h 00m, or 24h 00m with “Ends next day”.
duration = end − start
with Ends next day: duration = (24h − start) + endLimitation. This calculator uses nominal clock time and does not adjust for daylight saving changes.
Frequently asked questions
Why do I need “Ends next day”?
HourCalio never guesses that a time range crosses midnight. Turning it on confirms that the end time is on the following day.
What if the start and end times are the same?
The duration is 0h 00m. With “Ends next day” on, it is a full 24h 00m.
How do I enter midnight?
Midnight is 12:00 AM. A range from 10:00 PM to 12:00 AM needs “Ends next day”, because midnight starts the next day. The result is 2h 00m.
Does it adjust for daylight saving time?
No. It uses nominal clock time, so the night when clocks change is not adjusted.