Time Card Calculator
Enter up to 5 shifts. Leave unused rows blank.
| Day | Time In | Time Out | Break (min) |
|---|---|---|---|
How Date and Time Calculations Work
Calculating time differences, work hours, and date intervals requires handling the non-uniform nature of calendars — months have 28–31 days, leap years add a day, and daylight saving time shifts clocks by an hour. This calculator handles those complexities automatically so you get accurate results every time.
Common Time Calculation Formulas
- Time difference: Convert both times to total minutes from midnight, subtract, convert back
- Weekly work hours: Sum of daily hours; overtime typically kicks in above 8 hours/day or 40 hours/week (varies by state)
- Days between dates: Count calendar days inclusive or exclusive of start/end depending on context
- Business days: Subtract weekends and federal holidays from total calendar days
How to Use This Calculator
- Enter your start and end times or dates in the provided fields
- For work hours, enter daily clock-in and clock-out times for each day
- Include any unpaid break times to get accurate paid hours
- Click Calculate to see total hours, days, or the breakdown you need
Overtime Rules in the US
Under the Fair Labor Standards Act (FLSA), non-exempt employees must be paid 1.5× their regular rate for all hours over 40 in a workweek. Some states (California, Nevada, Alaska) have daily overtime rules — 1.5× after 8 hours in a single day. Always check your state labor law for the specific rules that apply to your situation.
Example: Weekly Timesheet
Mon–Fri: 8:00 AM – 5:00 PM with 30-min unpaid lunch = 8.5 hrs/day × 5 = 42.5 hours
Regular pay (40 hrs): 40 × hourly rate | Overtime (2.5 hrs): 2.5 × 1.5 × hourly rate