Work Hours Calculator
Tracking work hours accurately
Reliable calculation of working hours underpins payroll, project costing, and compliance with labor regulations. Manual math on paper timesheets invites mistakes, especially when shifts span midnight or include irregular breaks. This calculator accepts clock-in and clock-out times for each day of the week, subtracts breaks, and produces totals along with overtime beyond a configurable threshold. Because everything runs client-side, sensitive schedules never leave the user’s device, satisfying privacy requirements for many organizations.
The computation follows a straightforward algebraic model. For each day , convert the start time and end time into minutes since midnight. The daily work duration is , where represents break minutes. Summing across days yields weekly minutes . Dividing by 60 converts minutes to hours. Overtime arises when exceeds the threshold , giving .
Consider the example table below. It illustrates a typical five-day workweek with an extra Saturday half-day. Because Friday’s shift ends later than usual, the total surpasses forty hours, triggering overtime if the threshold remains at 40.
| Day | Start | End | Break | Hours worked |
|---|---|---|---|---|
| Mon | 09:00 | 17:00 | 1h | 7 |
| Tue | 09:00 | 17:30 | 0.5h | 8 |
| Wed | 09:00 | 17:00 | 1h | 7 |
| Thu | 09:00 | 17:00 | 1h | 7 |
| Fri | 09:00 | 19:00 | 1h | 9 |
| Sat | 10:00 | 14:00 | 0 | 4 |
Handling overnight shifts requires special care. If an employee starts at 22:00 and finishes at 06:00 the next morning, the calculator adds 24 hours to the end time to avoid negative durations. Break deductions treat any negative numbers as zero to prevent accidental overtime inflation. Adjust the threshold to reflect local labor laws, or experiment with alternative policies such as daily overtime triggers.
Use this calculator alongside the overtime-pay-calculator, hourly-to-salary-calculator, and salary-tax-calculator to turn tracked hours into compensation estimates and paycheck planning.
Recording your timesheet
After computing totals, press Copy Result to paste weekly hours and overtime into a timesheet or invoicing tool. Keeping a digital record helps resolve pay disputes and simplifies future budgeting.