Time Card Calculator
| Start Time | End Time | Break (min) | |
|---|---|---|---|
Time Card Calculator
The time card calculator adds up your daily work hours across a week, automatically deducting breaks and separating regular hours from overtime.
Conversion Formula
Each day is computed as: worked minutes = end time (in minutes) - start time (in minutes) - break minutes. If end time is before start time, 1440 minutes (24 hours) is added to handle overnight shifts. All daily totals are summed, then split into regular (up to 40 hrs) and overtime (beyond 40 hrs).
Step-by-Step Examples
Mon-Fri, 9:00-17:00 with 30 min break each day = 37.5 hours total, 37.5 regular, 0 overtime
7.5 hrs/day x 5 days = 37.5 hours, under the 40-hour threshold
Mon-Sat, 8:00-18:00 with 60 min break each day = 54 hours total, 40 regular, 14 overtime
9 hrs/day x 6 days = 54 hours; 14 hours above the 40-hour cap is overtime
History
Time cards originated in the 1880s with the invention of the mechanical time clock by Willard Bundy. Workers would insert a card to stamp their arrival and departure times, creating a physical record employers could audit for payroll.
Common Use Cases
- Weekly payroll calculation
- Freelance billing by the hour
- Overtime compliance tracking
- Contract work documentation
Frequently Asked Questions
How is overtime calculated?
Overtime is any total weekly hours beyond 40. For example, if you worked 43.5 hours in a week, 3.5 hours is overtime. This follows the standard US FLSA 40-hour threshold.
What time format does this accept?
Enter times in H:MM or HH:MM format using 24-hour time. For example, 9:00 for 9 AM, 13:30 for 1:30 PM, or 17:00 for 5 PM.
Does this handle overnight shifts?
Yes. If your end time is earlier than your start time (for example, start 22:00, end 06:00), the calculator automatically adds 24 hours to the end time and counts it as an overnight shift.
How is rounding handled?
Hours are shown in both hours+minutes (e.g., 8h 30m) and as a decimal (8.5 hrs). No rounding is applied - the exact worked time is used.