Time Clock & Duration Calculator
Calculate time between two times, subtract breaks, and track work hours for shifts, payroll, meetings, and schedules.
Calculate Work Hours Between Two Times
Enter a start time, end time, and optional break duration to calculate total hours, total minutes, and decimal hours. Overnight time ranges are handled automatically.
Why Use This Calculator?
It helps you calculate time differences, subtract breaks, and track work hours without manual counting, making scheduling, payroll, and shift planning much easier.
Calculate Time Faster
Instantly calculate hours and minutes between two times for shifts, meetings, schedules, and daily work tracking.
Subtract Breaks Automatically
Add an unpaid break in minutes to quickly see your actual worked time without doing extra math.
Works for Overnight Shifts
If your end time falls after midnight, the calculator handles it automatically for accurate results.
Time Clock Calculator for Work Hours, Breaks, and Time Differences
This free Time Clock & Duration Calculator helps you calculate the exact time between two times, subtract break time, and convert your total into hours and decimal hours. Whether you need to track employee time, estimate shift length, calculate time between meetings, or handle overnight work hours, this tool makes the process fast and simple.
How to Use This Time Clock Calculator
Enter the time you started, the time you finished, and any unpaid break minutes. The calculator first finds the full duration, then subtracts the break to show worked time in hours and minutes, total minutes, and decimal hours.
Enter the Start Time
Choose the time work, a meeting, or another timed activity began.
Enter the End Time
Choose the finishing time. Earlier end times are treated as occurring the next day.
Add Unpaid Breaks
Enter the combined number of unpaid break minutes, or leave the field blank if none apply.
Time Duration and Work Hours Formulas
The basic duration is the difference between the ending and starting times:
When an unpaid break applies, subtract it from the full duration:
To convert the final number of minutes into decimal hours, divide by 60:
Who This Tool Is For
This calculator is useful for employees, freelancers, managers, remote teams, and anyone who needs to calculate time accurately. It works well for timesheets, payroll prep, break deduction, planning meetings, and comparing shift lengths.
Helpful Related Guides
Time Duration Calculation Examples
These examples show how ordinary shifts, partial hours, breaks, and overnight work are handled.
| Example | Start and End | Break | Worked Time | Decimal Hours |
|---|---|---|---|---|
| Standard shift | 9:00 AM–5:30 PM | 30 minutes | 8 hrs | 8.00 |
| Partial-hour shift | 8:15 AM–4:45 PM | 45 minutes | 7 hrs 45 mins | 7.75 |
| Short meeting | 1:20 PM–2:05 PM | 0 minutes | 45 mins | 0.75 |
| Overnight shift | 10:00 PM–6:30 AM | 30 minutes | 8 hrs | 8.00 |
How Overnight Shifts Are Treated
If the end time is earlier than the start time, the calculator assumes the work period crossed midnight. For example, 10:00 PM to 6:00 AM is treated as an eight-hour duration, not a negative time difference.
Why Decimal Hours Matter
Timesheets, payroll systems, invoices, and project trackers often record time as decimal hours. Minutes are portions of an hour, so 30 minutes becomes 0.50 hours—not 0.30 hours.
| Minutes | Decimal Hours |
|---|---|
| 15 minutes | 0.25 |
| 30 minutes | 0.50 |
| 45 minutes | 0.75 |
| 60 minutes | 1.00 |
Common Time-Calculation Mistakes
Entering Paid Breaks
Only subtract a break when it should be excluded from worked time. Paid breaks generally remain included.
Treating Minutes as Decimals
Seven hours and 30 minutes equals 7.50 hours, not 7.30 hours.
Forgetting Midnight
An end time earlier than the start time usually indicates an overnight shift that continues into the following day.
Using Estimates for Payroll
Use calculator results for checking and planning, then compare them with official timecards and employer records.
Time Clock and Duration Calculator FAQs
How do I calculate the time between two times?
Subtract the start time from the end time. If the period crosses midnight, treat the end time as occurring on the following day. Then subtract any unpaid break minutes.
Can this calculator handle overnight shifts?
Yes. When the end time is earlier than the start time, the calculator treats the end time as being on the next day.
Should I enter paid breaks?
Usually no. This calculator’s break field is intended for time that should be deducted, such as an unpaid meal break. Workplace policies and applicable rules can differ.
How do I add several unpaid breaks?
Add the break periods together and enter the total. For example, a 30-minute meal break plus a 15-minute unpaid break equals 45 minutes.
What are decimal hours?
Decimal hours express minutes as a fraction of an hour. For example, 15 minutes is 0.25 hours, 30 minutes is 0.50 hours, and 45 minutes is 0.75 hours.
Can I use the result for payroll?
The result is useful for general checking and planning. Official pay can depend on rounding rules, paid-break policies, overtime rules, contracts, and local requirements, so verify final hours against official records.