Hours worked = end time − start time − unpaid breaks. 07:00 to 15:30 is 8 h 30 min on site; less a 30-minute break that is 8 h a day, or 40 h over 5 days. For payroll, divide minutes by 60 to get decimal hours: 7 h 45 min = 7.75 h. A shift that ends past midnight adds 24 hours to the end time.
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Total for 5 days
40 h 00 min
Total in decimal hours
40.00 h
Paid hours per day
8 h 00 min
Per day in decimal hours
8.00 h
Start to finish per day
8 h 30 min
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Start to finish = 15:30 − 07:00 = 8 h 30 min = 510 min
Paid per day = 510 − 30 min break = 480 min = 8 h 00 min (8:00)
Decimal hours = 480 ÷ 60 = 8.00 h (for timesheets and payroll)
Total = 8 h 00 min × 5 = 40 h 00 min = 40.00 h
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Formula
Hours worked = end time − start time − unpaid breaksIf the end is earlier than the start, add 24 h (night shift)Decimal hours = hours + minutes ÷ 60Finish time = start time + duration (take off 24 h for each day passed)
Worked Example
A crew works 07:00 to 15:30 with a 30-minute unpaid lunch, 5 days:
Start to finish = 15:30 − 07:00 = 8 h 30 min = 510 min
Paid per day = 510 − 30 = 480 min = 8 h (8.00 decimal hours)
Week = 8 h × 5 = 40 h
Minutes to Decimal Hours
Minutes
Decimal hours
Minutes
Decimal hours
5
0.08
35
0.58
10
0.17
40
0.67
15
0.25
45
0.75
20
0.33
50
0.83
25
0.42
55
0.92
30
0.50
60
1.00
Common Shifts
Shift
Break
Paid per day
5 days
6 days
07:00 to 15:30
30 min
8 h
40 h
48 h
07:30 to 17:00
60 min
8 h 30 min
42 h 30 min
51 h
08:00 to 17:00
60 min
8 h
40 h
48 h
06:00 to 18:00
60 min
11 h
55 h
66 h
22:00 to 06:30
30 min
8 h
40 h
48 h
Frequently Asked Questions
How do I calculate hours worked?
Subtract the start time from the end time, then take off unpaid breaks. 07:30 to 16:00 is 8 h 30 min; less a 30-minute lunch, that is 8 h paid.
How do I convert minutes to decimal hours?
Divide the minutes by 60. 15 min = 0.25 h, 30 min = 0.5 h and 45 min = 0.75 h, so 7 h 45 min is 7.75 h on a timesheet.
How do I work out hours for a night shift?
When the end time is earlier than the start, the shift runs past midnight: add 24 hours to the end time. 22:00 to 06:30 is 30:30 − 22:00 = 8 h 30 min; less a 30-minute break, 8 h.
How do I add hours and minutes?
Add the hours and the minutes separately, then carry every 60 minutes into an hour. 3 h 45 min + 2 h 30 min = 5 h 75 min = 6 h 15 min.
How many hours is 7 a.m. to 3:30 p.m.?
8 hours 30 minutes. With a 30-minute unpaid break, 8 paid hours a day, or 40 hours over a five-day week.
How do I find what time a job will finish?
Add the duration to the start time. A concrete pour starting at 07:00 that takes 5 h 30 min finishes at 12:30. Past 24:00, take off 24 hours and it finishes the next day.
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