Work Hours Calculator
Calculate net hours worked from start and end times with automatic break deduction. Use daily, weekly or custom date range modes.
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Why Work Hours Calculators Matter
Manual timesheet calculation is error-prone. A 30-minute discrepancy over 20 workdays is 10 hours — a full working day's pay. Whether you are a freelancer billing by the hour, an employer processing payroll, or an employee tracking overtime, accurate hour calculation is essential.
Break Deduction
Gross hours are the total time from clock-in to clock-out. Net hours subtract break time. In Nigeria, a standard working day is typically 8 hours with a 1-hour lunch break, giving a 9-hour presence at work. The calculator deducts your specified break time from the total to give you actual billable or payable hours.
Frequently Asked Questions
Subtract the start time from the end time. If your times are in HH:MM format: convert both to total minutes (hours × 60 + minutes), subtract, then convert back. Example: 9:00 to 17:30 = (17×60+30) - (9×60) = 1050 - 540 = 510 minutes = 8.5 hours. This calculator handles it automatically including overnight shifts.
Under Nigerian labour law, the standard working week is 40 hours (8 hours per day, 5 days). Hours beyond 40 per week are overtime, typically paid at 1.5× the normal hourly rate. The exact rate depends on your employment contract and sector. Use the weekly mode to see your total hours and calculate any overtime manually.
Gross hours are the total span from start to end time. Net hours subtract unpaid breaks. If you work 9:00 to 17:00 with a 1-hour lunch, gross hours = 8, net hours = 7. Payroll typically uses net hours. Billable client time also uses net hours.
Use Custom Period mode and set the start datetime and end datetime on different dates. For example, a night shift from 23:00 on June 12 to 07:00 on June 13 would correctly calculate as 8 hours.
Yes — use Weekly mode, uncheck the days you did not work, and set the start/end times for each day you worked. The calculator totals only the active days.