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Shift Hours Calculator

Calculate total hours across multiple shifts — including overnight shifts and split schedules.

Ideal for managers, payroll administrators, and teams with rotating or variable shifts.

Shift Hours Calculator

All times in 24-hour format (HH:MM)

Start (HH:MM)

End (HH:MM)

Break (min)

Overnight shifts (e.g. 22:00 – 06:00) are automatically handled.

Example Shift Calculations

Common multi-shift patterns and their totals

1 Split Day
Shift A08:00 – 12:00
Shift B14:00 – 18:00
Breaks0 + 0 min

Total

8h

2 Night Shift
Shift A22:00 – 06:00
Shift B10:00 – 14:00
Breaks30 + 0 min

Total

11h 30m

3 Three Shifts
Morning06:00 – 10:00
Afternoon13:00 – 17:00
Evening20:00 – 23:00

Total

11h

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How to Calculate Hours Across Multiple Shifts

For employees working split shifts, rotating schedules, or irregular hours, calculating total work time requires adding up each shift individually — accounting for break deductions and overnight crossings.

The formula per shift is: (End Time − Start Time) − Break Duration = Payable Hours. Sum each shift's payable hours for the daily or weekly total. For overnight shifts, add 24 hours to the end time before subtracting.

Overnight Shift Calculation

An overnight shift crosses midnight — for example, starting at 22:00 and ending at 06:00. Subtracting 22:00 from 06:00 gives a negative number, so the correct approach is to add 24 hours to the end time: 06:00 + 24:00 = 30:00, then 30:00 − 22:00 = 8 hours.

This calculator handles overnight shifts automatically. If the end time you enter is earlier than the start time, the shift is treated as crossing midnight.

Why Accurate Shift Tracking Matters

Inaccurate shift records lead to payroll errors, compliance risks, and employee disputes. For teams with complex schedules — healthcare, hospitality, logistics, security — automated attendance tracking removes the risk of manual miscalculation and ensures every hour is recorded accurately.

Frequently Asked Questions

About shift hours calculation

How do I calculate total hours across multiple shifts?
Enter the start time, end time, and break duration for each shift. The calculator sums all shift durations minus breaks to give you total payable hours.
Can this calculator handle overnight shifts?
Yes. If the end time is earlier than the start time (e.g. 22:00 to 06:00), the calculator automatically treats it as an overnight shift spanning midnight.
What is a shift hours calculator used for?
It helps HR teams, payroll administrators, and managers quickly add up hours worked across multiple shifts — especially useful for rotating shifts, night shifts, and split schedules.
How are overnight shifts calculated?
A shift from 22:00 to 06:00 = 8 hours. The calculator detects when end time is earlier than start time and adds 24 hours automatically.

Automate shift tracking with Timenox

Timenox records employee check-in and check-out times automatically via QR or browser link — no manual entry, no spreadsheets. Free for up to 10 employees.

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