How many hours is 9am to 9pm?
9am to 9pm
12 hours
9am to 9pm is 12 hours, or 720 minutes.
- Hours and minutes
- 12 hours
- Total minutes
- 720
- Decimal hours
- 12
- With a 30-minute unpaid break
- 11 hours 30 minutes (11.5 decimal hours)
- Crosses midnight
- No
- 24-hour notation
- 09:00 to 21:00
About this shift
The shift starts in the morning and ends late in the evening on the same date. It doesn't cross midnight, so the hours are a plain subtraction. From 9am to noon is 3 hours, and from noon to 9pm is 9 hours.
Three 12-hour shifts make 36 hours a week and four make 48 hours. With a 30-minute unpaid break on each, three come to 34 hours 30 minutes.
If you take a 30-minute unpaid break, 11 hours 30 minutes remain, which a timesheet in decimal hours shows as 11.5. 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: 09:00 and 21:00.
- Subtract. 21:00 − 09:00 = 12:00, which is 12 hours.
- For minutes, 12 × 60 = 720. For decimal hours, 720 ÷ 60 = 12.
- With the break, 720 − 30 = 690 minutes, or 11 hours 30 minutes.
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