How to Calculate Part-Time Work Hours
To calculate part-time work hours, total the net duration of each shift in the period. Part-time schedules can vary, so use the actual start times, end times, and unpaid breaks rather than assuming a fixed daily duration.
Practical timekeeping guide · ShiftHours
Calculate each shift separately
If you work Monday for 5 hours, Wednesday for 6 hours, and Friday for 4 hours 30 minutes, the total is 15 hours 30 minutes before any break adjustments not already included.
When shifts include unpaid breaks, subtract those breaks before adding the net durations.
Use minutes to avoid errors
Convert each shift to minutes, add the minutes, and divide by 60 for decimal hours. For 5 hours 30 minutes, the calculation is 330 minutes. This is 5.5 decimal hours.
The decimal value is useful if a timesheet asks for numeric hours rather than a time display such as 5:30.
Compare planned and actual hours
A roster may show scheduled hours, while a timesheet records actual clock times. Keep both if you need to compare planned work with attendance. Changes, unpaid breaks, and missed punches can make the totals different.
Benefits, eligibility, and overtime definitions can depend on local rules or employment terms, so do not rely on a general hours calculator for those decisions.
Make weekly tracking easier
Use the weekly work hours calculator to add different-length shifts and view total net time and decimal hours.
Use the free ShiftHours work hours calculator to calculate shift length, subtract unpaid breaks, and view decimal hours. For weekly totals, try the weekly calculator.
Worked example: part-time schedule
A worker scheduled for four 5-hour shifts works 20 scheduled hours per week. If each shift includes a 15-minute unpaid break, subtract one hour of breaks across the four shifts, leaving 19 net hours.
Related resources
Open the work hours calculator · Browse all ShiftHours articles · Decimal hours chart