It also flags shifts that cross midnight (so a 22:00 - 06:00 shift counts as 8 hours, not negative 16), and lets you set a night-shift bonus as a percentage of hours. Use it to keep your own timesheet honest, or to size a roster before publishing it.
Calculator
How to use the Shift Work Hours Calculator
- Add a row for each shift, with start, end and break minutes.
- Use 24-hour time; shifts can cross midnight.
- Read the total, night hours and any overtime.
- Add or remove rows to model different weeks.
About this tool
The Shift Work Hours Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Self-billing for an irregular schedule.
- Planning a hospital or security roster.
- Auditing your hours for a payroll dispute.
- Comparing two shift patterns for the same week.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
What counts as night work?
Most labour laws define night work as hours between 23:00 and 06:00 (or 22:00 - 05:00 in some jurisdictions). The calculator uses 22:00 - 06:00.
How is overtime calculated?
Above 40 hours per week by default. Some countries use 35, 37.5 or 48 - set the threshold in the source and adjust as needed.
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