About this Time Card Calculator
Tracking work hours accurately is essential for getting paid correctly. This tool handles the tricky math of subtracting minutes for lunch breaks and converting time formats into decimal hours for payroll.
Who this calculator is for
- Hourly employees, freelancers, and contractors tracking daily shift totals before submitting time.
- Managers or payroll staff verifying work-hour entries with unpaid breaks removed.
- Anyone working overnight or irregular shifts who wants a quick daily hours check.
When to use it
- Calculate net hours worked for a single shift after lunch or other unpaid breaks.
- Convert a start/end shift into decimal hours for payroll, invoicing, or staffing logs.
- Double-check overnight time entries before copying totals into a timesheet system.
How to use this calculator
- Enter your Start Time (Clock In).
- Enter your End Time (Clock Out).
- Enter Break Duration in minutes (e.g., 30 for lunch).
- The result shows total hours in both decimal format (for payroll) and hours/minutes.
Key assumptions
- If the end time is earlier than the start time, the tool assumes the shift crossed midnight once.
- Break time is treated as unpaid and is subtracted directly from the elapsed shift length.
- The calculator handles one shift block at a time and does not total multiple days or multiple breaks.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
1. Convert Start and End times to minutes from midnight.
2. Handle overnight shifts (if End < Start, add 24 hours).
3. Subtract the Break duration.
4. Convert the net minutes back to Hours:Minutes and Decimal Hours.
Inputs explained
Start/End Time
Supports 12-hour (AM/PM) or 24-hour formats depending on your device settings.
Break
Unpaid time off the clock. Enter 0 if you don't take a break or if your break is paid.
Understanding your results
Decimal Hours (e.g. 8.5) is what you typically enter into payroll software. Hours & Minutes (e.g. 8h 30m) is easier for personal tracking.
Example scenarios
Standard Day
9:00 AM to 5:00 PM. 30 min break. Total: 7.5 hours.
Night Shift
10:00 PM to 6:00 AM. No break. Total: 8.0 hours.
Key Features
- Overnight Shift Logic
- Break Deduction
- Decimal Conversion
Tips & Best Practices
- Round your times to the nearest 15 minutes (quarter hour) if that is your company policy.
- Double-check AM/PM settings if the result looks wrong.
Glossary of Terms
- Decimal Hours
- Time expressed as a decimal (e.g., 1 hour 15 minutes = 1.25 hours).
- Unpaid Break
- Time deducted from total work hours, usually for meals.