Hours Worked Calculator

Calculating hours worked is the difference between your clock-out and clock-in times, minus any unpaid break. It sounds trivial, but real shifts are full of subtle cases — overnight crossings, unpaid lunch, and the need to present the result as a decimal for payroll. This calculator handles the fiddly parts for you.

The simple case

Clock in at 09:00, out at 17:00, no overnight:

17:00 − 09:00 = 8 hours
Minus a 30-minute break = 7 hours 30 minutes (7.5 hours)

Overnight shifts

If you clock in at 23:00 and out at 07:00, the shift crosses midnight, so the raw subtraction 07:00 − 23:00 would be negative. The calculator adds 24 hours to bring the end time past the start:

07:00 + 24:00 = 31:00
31:00 − 23:00 = 8 hours (before breaks)

Simply toggle the "ends next day" option and the math works itself out — exactly the kind of case people get wrong with a pen and paper.

Gross, break and net hours

The tool separates the three numbers clearly:

• Gross (shift length) — the total between clock-in and clock-out, regardless of breaks
• Break time — whatever you subtract, up to the minutes you set
• Net hours worked — the figure that actually gets paid, after subtracting the break

Tips for accurate time tracking

• Track the exact minute — round only at the very end, not at each clock in or out. Rounding every entry introduces drift across a week or month.
• Lunch breaks matter — a 30- or 60-minute unpaid meal break usually does not count as work time, while short paid breaks often do. Confirm what your employment agreement says, then subtract accordingly.
• Decimal for payroll — most payroll, timesheet and billing systems record 7.5 hours, not "7 hours 30 min." To convert manually, divide the minutes by 60 (30 ÷ 60 = 0.5). The calculator gives you the decimal and the plain-language text side by side.
• Weekly usage — use this tool per shift, then sum the daily totals. For a full week with overtime at 1.5x, feed the weekly net hours into a timesheet or overtime calculator on top of this per-shift figure.
• Multiple shifts in a day — if someone splits a day across two shifts (a morning stint and an evening stint), calculate each one separately and add the net hours.

Uses

• Employee timesheets and payroll — converting shifts into billable or payable hours
• Freelance and contract invoicing — turning logged time into decimal hours for a client
• Shift planning — checking whether rosters meet daily or weekly hour targets
• Self-auditing — verifying an employer's or software's hour totals before sign-off

Historical note

The modern sense of "work hours" took shape during the Industrial Revolution, when factory clocks and punch cards made exact, minute-level attendance a necessity; today the decimal-hour and payroll conventions of that era still govern how paid time is recorded.