What this calculator does
Whether you are tracking work hours, shifts or project time, the duration between two times plus break deduction is a daily calculation. Decimal hours are especially useful for invoicing.
This calculator handles overnight shifts, subtracts breaks and shows the result in hours/minutes and decimal hours.
Duration formula
Net = end time − start time (+24 h if overnight) − break Times are converted to minutes. If the end is earlier than the start, 24 hours are added. Decimal hours equal minutes divided by 60.
How this calculator works
- 01
Enter start and end
Overnight shifts are detected automatically.
- 02
Deduct the break
Enter unpaid break time in minutes.
- 03
Read the net duration
See hours/minutes and decimal hours for invoicing.
Frequently asked questions
How are overnight hours handled?
If the end time is earlier than the start time, the calculator adds 24 hours and treats it as the next day.
What are decimal hours?
Thirty minutes equals 0.5 decimal hours. Timesheets and invoices often use this format.
Are legal break rules checked?
No. Only the break you enter is deducted. Employment law and collective agreements must be checked separately.
Data basis: 2026 · Annual constants live in structured JSON files and are updated once a year.
Results are unverified model calculations and do not replace tax, legal or financial advice.