Work Hours Calculator

How work hours and overtime are calculated

Payroll time math has three steps: 1. each shift's length = end time − start time − unpaid breaks; 2. weekly total = the sum of shift lengths; 3. overtime = hours above the legal standard, paid at a premium. Unpaid breaks are the step most people forget — a 9-hour presence with a 1-hour lunch is 8 payable hours, not 9.

Worked example: a week with Saturday overtime

Five shifts of 8:30–17:30 with a 1-hour unpaid break: (17.5 − 8.5) − 1 = 8 hours/day, × 5 = 40 hours. Add Saturday 9:00–13:00 = 4 hours → weekly total 44 hours. Against a 40-hour standard, overtime = 4 hours; at a $20 hourly rate with time-and-a-half, overtime pay = 4 × 20 × 1.5 = $120. Overnight shifts wrap past midnight: 22:00→06:00 = (6 + 24) − 22 = 8 hours before breaks.

Practical tips and limits

In Saudi Arabia, the standard work week is 48 hours (8/day) and overtime is paid at 150% of the hourly rate under the Labour Law — this calculator's overtime threshold is adjustable for exactly that reason. Convert salary to hourly rate as monthly salary ÷ 30 ÷ 8 (the Saudi convention) when checking overtime pay. And keep records: the calculator totals your hours, but in any pay dispute, dated timesheets — even a simple daily note — are what actually get wages corrected.