How many hours is 4am to 12:30pm?
4am to 12:30pm
8 hours 30 minutes
4am to 12:30pm is 8 hours 30 minutes, or 510 minutes.
- Hours and minutes
- 8 hours 30 minutes
- Total minutes
- 510
- Decimal hours
- 8.5
- With a 30-minute unpaid break
- 8 hours (8 decimal hours)
- Crosses midnight
- No
- 24-hour notation
- 04:00 to 12:30
About this shift
The shift starts in the small hours and ends in the afternoon on the same date. It doesn't cross midnight, so the hours are a plain subtraction. From 4am to noon is 8 hours, and from noon to 12:30pm is 30 minutes.
8 hours 30 minutes is 30 minutes more than an 8-hour day. Four of these shifts come to 34 hours a week, and five come to 42 hours 30 minutes.
If you take a 30-minute unpaid break, 8 hours remain, which a timesheet in decimal hours shows as 8. The 30 minutes is an example, not a legal rule. Break and overtime rules depend on your contract and where you work. This page gives clock time only.
How the hours are worked out
- Write both times in 24-hour form: 04:00 and 12:30.
- Subtract. 12:30 − 04:00 = 8:30, which is 8 hours 30 minutes.
- For minutes, 8 × 60 + 30 = 510. For decimal hours, 510 ÷ 60 = 8.5.
- With the break, 510 − 30 = 480 minutes, or 8 hours.
Nearby start and end times
Other times, or a whole week
The hours calculator takes your own start and end time for each day, a break per day and an optional hourly rate, and adds up the week. Open the hours calculator