Skip to content
WorkHoursKit

Overnight Shift Calculator

Calculate a shift that begins on one day and ends on the next day.

Night shifts Cross-midnight Break deduction Decimal hours
Privacy: calculations are completed in your browser. The calculator does not require an account or send the entered values to a WorkHoursKit database.

How to use the Overnight Shift Calculator

  1. Enter the shift start, shift end and unpaid break.
  2. Review the values before calculating, especially the break length and whether the end time is on the following day.
  3. Select Calculate to calculate gross overnight duration and worked time after the break.
  4. Correct the inputs if the result looks unexpected; a common source of error is entering a break that is longer than or equal to the shift.

What this calculator does

Calculate a shift that begins on one day and ends on the next day. Its calculation is driven by the shift start, shift end and unpaid break. The output is intended to calculate gross overnight duration and worked time after the break, while workplace rules and source records remain external to the calculator.

This calculator processes the entered time values in the browser and presents both a readable duration and, where relevant, a decimal-hour value. Keep source records such as approved punches or timesheets when the result will be used for payroll review.

Worked time = overnight elapsed time - unpaid break.

Separate gross shift time from paid work time

For an overnight shift, the elapsed period first has to cross midnight correctly. Only after that should an unpaid break be subtracted. Keeping those two steps separate makes it easier to compare the result with a time clock or approved shift record.

Calculation example

Example input: Start 10:00 PM; End 6:00 AM; Break 30 minutes

Example result: 7h 30m worked, equal to 7.50 decimal hours.

Your result will change with the shift start, shift end and unpaid break; check the break length and whether the end time is on the following day before comparing it with another system.

How to interpret the result

Time entries can cross midnight when the calculator supports an end time earlier than the start. Review breaks carefully and avoid entering the same unpaid period twice.

Verify the break length and whether the end time is on the following day, and do not rely on the result if you may be entering a break that is longer than or equal to the shift.

Practical checks before using the result

  • Verify the key assumption: the break length and whether the end time is on the following day.
  • Avoid a common error: entering a break that is longer than or equal to the shift.

Calculation design and testing notes are documented in the Calculator Methodology and Accuracy Policy.

Related WorkHoursKit tools

Split Shift Calculator Combine up to three separate work periods without counting the gaps between them. Minutes to Decimal Hours Convert a total number of minutes into payroll-friendly decimal hours. Decimal Hours to Time Change a decimal-hour value into a familiar hours-and-minutes duration. Hours & Minutes Calculator Add or subtract two work-time durations.
Important: verify source information, official requirements and workplace policies before using a result for payroll, compliance, scheduling, staffing or employment decisions.