A practical guide to calculating work hours, breaks, overtime, weekly totals and monthly timesheet estimates.
What counts as work hours?
Work hours normally mean the time between clock-in and clock-out after subtracting unpaid breaks. Some workplaces count paid breaks, training time or travel time differently, so the formula should match the policy used for the timesheet.
Basic formula
Work Hours = Clock Out Time - Clock In Time - Unpaid Break Time. Weekly Work Hours = Sum of Daily Work Hours. Monthly estimate can be calculated by adding actual days or multiplying weekly average by the number of work weeks.
Example shift calculation
If a person works from 9:00 to 18:00 and takes a 60-minute unpaid lunch break, total time on site is 9 hours and working time is 8 hours. For five similar days, weekly total is 40 hours.
Overtime comparison
Overtime depends on company policy and local rules. A calculator can show hours above an 8-hour day or 40-hour week, but it cannot decide the legal rate or payroll treatment. Always compare with your employment policy.
Mistakes users make
The most common mistake is forgetting breaks. Another issue is overnight shifts. A 22:00 to 06:00 shift crosses midnight and should be handled carefully. Some people also convert minutes incorrectly, treating 30 minutes as 0.30 hours instead of 0.5 hours.
Timesheet checklist
Record start time, end time, unpaid breaks, paid breaks if applicable, leave, holiday, overtime approval and rounding rules. Keep a copy of the calculation when submitting a weekly or monthly sheet.
Deep-dive planning table
A daily work-hour calculation is only the first step. Weekly and monthly sheets need consistency. If Monday to Friday each has different breaks, add each day separately. For monthly planning, use actual workdays rather than assuming every month has the same number of working days.
Table: timesheet values to record
| Field | Why it matters | Common mistake |
|---|---|---|
| Start time | Begins the shift duration | Using scheduled time instead of actual time |
| End time | Ends the shift duration | Forgetting overnight shifts |
| Break | Removes unpaid time | Counting paid and unpaid breaks together |
| Overtime approval | Supports payroll review | Assuming all extra time is paid overtime |
Decimal hours for payroll
Many payroll sheets use decimal hours. Fifteen minutes is 0.25 hour, thirty minutes is 0.5 hour and forty-five minutes is 0.75 hour. Writing 7 hours 30 minutes as 7.30 is incorrect; it should be 7.5 decimal hours.
Internal linking path
Use Work Hours Calculator for timesheets, Time Calculator for adding durations and Date Difference Calculator for project periods. These pages work together for office planning, freelance billing and attendance review.
Link-building path inside Erapse
This guide connects to the related calculator and supporting articles so users can move naturally from explanation to calculation. Internal links help readers answer the next question without returning to search.
Related guides
FAQs
How do I convert minutes to decimal hours?
Divide minutes by 60. For example, 30 minutes is 0.5 hours.
Does the calculator decide overtime pay?
No. It estimates hours. Payroll rules decide overtime pay.
Can it handle weekly totals?
Yes, use daily totals and add them for the week.