Calculate the exact time difference between two moments with LiteCalc’s Time Duration Calculator. Get precise results in hours, minutes, and seconds—ideal for tracking work hours, scheduling projects, or measuring event durations.
Use the time picker to set your start time. You can input it in either 12-hour or 24-hour format, depending on your preference or regional standard. This allows flexibility for global users who track time differently.
Enter your end time using the same format. If the end time extends past midnight, simply select the “Next Day” option to ensure the calculator includes hours from both days in the total duration.
Click “Calculate” to instantly display the time difference in hours, minutes, and seconds. LiteCalc’s algorithm automatically accounts for time rollovers, ensuring your duration is precise to the second, no matter the format or date span.
This calculator has two modes — a quick time-only mode and a full date+time mode for multi-day durations. Here is how to use each:
Select your start time (hours, minutes, seconds) and end time using the dropdowns. Click the clock icon next to each row to pre-fill the current time. Click Calculate Duration. If the end time is earlier than the start time (overnight shift), the calculator automatically adds 24 hours so the result reflects the correct overnight span.
Example: Start 08:30:00 → End 17:15:00 → Result: 8 hours, 45 minutes, 0 seconds (8.75 decimal hours)
Toggle Enable Date Selection. Date fields appear for both start and end. Enter the dates and times, then click Calculate Duration. Use this for multi-day durations such as project spans, vacation lengths, or billing periods.
Example: Start March 15, 2026 09:00:00 → End March 18, 2026 17:00:00 → Result: 3 days, 8 hours, 0 minutes
The primary result shows duration in HH:MM:SS format (e.g., 08:45:00). This is the most precise representation and matches the format used by time cards and scheduling software.
The breakdown also shows the full duration converted to total minutes or seconds. 8 hours 45 minutes = 525 total minutes = 31,500 total seconds. Useful for scientific, engineering, or programming contexts.
Decimal hours convert minutes to a fraction of an hour: 8h 45min = 8.75. This format is required for payroll calculations. Multiply decimal hours by your hourly rate to get pay: 8.75 × $20/hr = $175.00.
When your end time is before your start time, the calculator adds 24 hours to the end time automatically. A shift from 22:00 (10:00 PM) to 06:00 (6:00 AM) = 8 hours exactly. This logic works for any overnight or cross-midnight shift without any extra steps from you.
Understanding the math behind time duration helps you verify results and perform quick mental estimates for payroll, billing, and scheduling.
Duration = End Time − Start Time (in seconds)
Convert both times to seconds-since-midnight: Time (s) = (hours × 3600) + (minutes × 60) + seconds
Problem: An employee clocks in at 8:30 AM and clocks out at 5:15 PM. What is the total time worked and what are the decimal hours for payroll?
Problem: A nurse works a night shift from 10:45 PM to 7:00 AM. What is the total shift duration?
Enter start: 22, 45, 00 and end: 07, 00, 00 in the calculator. It handles the overnight logic automatically.
Decimal Hours = Hours + (Minutes ÷ 60) + (Seconds ÷ 3600)
Example: 3h 20m 30s = 3 + (20/60) + (30/3600) = 3 + 0.3333 + 0.0083 = 3.3417 decimal hours
Enter each shift's start and end times. Note the decimal hours result. For 5 shifts of 8.75, 7.5, 8.0, 9.25, and 8.5 hours: sum = 42.0 decimal hours. At $15/hr: 42.0 × $15 = $630. If your company uses a 40-hour standard, 2.0 hours over = overtime.
Freelancers commonly bill by the quarter-hour (0.25 decimal hours). A task that takes 1 hour 10 minutes = 1.17 decimal hours. Round up to 1.25 (1h 15m) for billable time. Track multiple tasks, sum the decimal hours, and multiply by your hourly rate for your client invoice.
Enter your departure time and arrival time to find the total travel time. A flight departing 07:45 and arriving 15:20 is 7 hours 35 minutes. For international travel where arrival is the next day, use Date Selection mode. Enable dates, enter the departure date and arrival date separately.
Log when you start and finish each task. For a software sprint that ran Monday 9:00 AM to Friday 6:00 PM, use Date Selection mode. Enter the start and end dates and times to get the full elapsed time. Divide total hours by 8 to find equivalent work days for reporting.
Start a workout at 6:15 AM and finish at 7:02 AM — that's 47 minutes. Over a week you logged 5 sessions: 47, 52, 38, 60, and 45 minutes. Total = 242 minutes = 4 hours 2 minutes of training. Use the total minutes output for easy addition across sessions.
A production shift runs 06:00 to 14:30 (8.5 hours). Track machine uptime by entering operation start and end times. For a machine that ran 06:15 to 13:45 = 7.5 hours. Downtime = 8.5 − 7.5 = 1 hour. Calculate OEE (Overall Equipment Effectiveness) by dividing uptime by total shift time.
The most common reason people use a time duration calculator is payroll. Converting hours and minutes to decimal hours is essential because payroll systems multiply your hourly rate by a decimal number — not by an HH:MM value.
| Hours & Minutes | Decimal Hours | Pay at $20/hr | Pay at $25/hr |
|---|---|---|---|
| 8h 00m | 8.00 | $160.00 | $200.00 |
| 8h 15m | 8.25 | $165.00 | $206.25 |
| 8h 30m | 8.50 | $170.00 | $212.50 |
| 8h 45m | 8.75 | $175.00 | $218.75 |
| 9h 00m | 9.00 | $180.00 | $225.00 |
| 10h 30m | 10.50 | $210.00 | $262.50 |
| 12h 00m | 12.00 | $240.00 | $300.00 |
Under US federal law (FLSA), hourly employees earn 1.5× their regular rate for hours worked beyond 40 in a workweek. Some states like California also require daily overtime for shifts exceeding 8 hours.
Example: An employee works 45.5 decimal hours in a week at $16/hr. Regular pay: 40 × $16 = $640. Overtime: 5.5 × ($16 × 1.5) = 5.5 × $24 = $132. Total gross = $772.
Add/subtract time from dates.
Find deadlines and project due dates.
Add days, weeks, or months.
Add or subtract hours and minutes.
Compare times worldwide.
Measure elapsed time between two dates.
Simply enter your start and end times, then click “Calculate.” The LiteCalc Time Duration Calculator instantly displays the total time difference in hours, minutes, and seconds.
Yes. If your end time falls on the following day, select the “Next Day” option. The calculator automatically includes the extra hours past midnight in the total duration.
Absolutely. You can input times using either a 12-hour (AM/PM) or 24-hour format. LiteCalc correctly interprets and converts both for accurate results.
Yes. The Time Duration Calculator is perfect for logging employee work shifts, overtime, or project hours. Pair it with the LiteCalc Time Card Calculator for payroll-ready results.
After entering your start and end times, click “Calculate.” The result will show total time in hours, minutes, and seconds. You can round to the nearest hour if needed for work-time summaries.
Yes. The calculator accurately tracks total time between project start and end points, making it ideal for freelancers, project managers, and productivity tracking.
The calculator provides precision to the exact second. It handles same-day and overnight calculations automatically, ensuring no rounding or timing errors.
You can calculate same-zone durations directly here. For cross-zone comparisons, use the LiteCalc Timezone Converter to adjust times before entering them into the duration calculator.
Yes. It’s excellent for timing travel durations, workout sessions, study hours, or events. Enter your departure and arrival times to instantly find the total travel time.
Yes. LiteCalc offers this and all related calculators—such as the Time Card, Date Time, and Due Date Calculators—completely free with no sign-up required.