Hours Between Two Times & Shift Duration Calculator

Payroll Administration: Calculating Elapsed Shift Hours & Break Compliance

Accurate shift time tracking is essential for corporate timekeeping, client billing, and compliance with Department of Labor meal break regulations.

Handling Overnight Graveyard Shifts Across Midnight

When an employee clocks in during the evening and clocks out the following morning:

• A naive subtraction) yields a negative number.

• The correct algorithm adds 24 hours (1,440 minutes) to the second day's time: \ - 22:00 = 30:30 - 22:00 = 8 hours, 30 minutes.

How to Use This Calculator

Enter your Start Time: Hour (1 - 12) (e.g. 9), Start Time: Minute (0 - 59) (e.g. 0), Start Time: AM / PM — choose from AM (Morning), PM (Afternoon / Evening), End Time: Hour (1 - 12) (e.g. 5), End Time: Minute (0 - 59) (e.g. 30), End Time: AM / PM — choose from PM (Afternoon / Evening), AM (Next Day Morning - Overnight Shift), Unpaid Lunch / Rest Break (Minutes) — choose from 0 Minutes (No break deduction), 15 Minutes Break, 30 Minutes (Standard 1/2 hour lunch), and Optional Hourly Pay Rate ( / hour) (e.g. 25.00). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Elapsed clock time and timesheet payroll equations: 24-Hour Minutes = (H_24 × 60) + M_1 24-Hour Minutes = (H_24 × 60) + M_2 (+ 1,440 if Overnight Shift) Elapsed Minutes = End Minutes - Start Minutes Working Minutes = Gross Elapsed Minutes - Break Minutes Decimal Hours = (Net Working Minutes) / (60) Gross Pay (\) = Net Decimal Hours × Hourly Rate

Worked Example

For example, clocking in at 9:00 AM and clocking out at 5:30 PM with a 30-minute unpaid lunch break at a 25.00/hour wage: Gross elapsed time is 8 hours, 30 minutes (510 mins). Deducting 30 minutes of lunch leaves 8 hours, 00 minutes (8.00 decimal hours). Shift gross earnings equal .

Understanding Your Result

Time conversion reference: 1 year = 365.25 days (accounting for leap years) = 8,766 hours = 525,960 minutes. A "month" varies 28–31 days — use exact date math for legal or contractual calculations rather than assuming 30 days/month. For project management: a work-year is typically 260 days (52 weeks × 5 days). Effective time estimates should include buffer — the Planning Fallacy (Kahneman) shows people underestimate task duration by 25–50% on average.