Hours Calculator
Calculate hours worked or time elapsed between two clock times.
Learn More About Hours Calculator
What this hours calculator is for
This tool measures the amount of time between a start and end clock time. It is especially useful for work shifts, break calculations, appointments, and quick checks when you only care about hours and minutes rather than full calendar dates.
It also helps with overnight spans, which are easy to miscalculate if you try to do them mentally.
Example work-shift calculation
If a shift starts at 8:30 AM and ends at 5:00 PM, the elapsed time is 8 hours and 30 minutes before breaks. If a shift starts at 10:00 PM and ends at 6:00 AM, the calculator recognizes that the end time is on the following day and still returns the correct duration.
That makes it handy for payroll estimates, staffing checks, and personal time tracking.
Hours calculator vs time calculator
Use the hours calculator when you only need the difference between two times on a clock. Use the time calculator when you need a full date-and-time range that might span multiple days, months, or years.
Choosing the right tool keeps the input simpler and helps avoid mistakes about whether an overnight period crosses into another date.
Frequently Asked Questions
How does the hours calculator work?
Enter a start time and an end time in 12-hour (AM/PM) or 24-hour format. The calculator finds the duration between them — how many hours and minutes passed. It handles times that cross midnight (overnight) correctly, as well as times on the same day.
Can I calculate hours worked for payroll?
Yes. This calculator is commonly used for tracking work hours. Enter your clock-in and clock-out times to find the total hours worked in a single shift. For a full work week, add up the results from each day separately.
How do I handle overnight shifts?
If you work from 10 PM to 6 AM the next morning, that's an overnight shift. The calculator correctly handles this by recognizing the end time is on the following day. Simply enter the start time and end time as shown and the correct duration will be calculated.
What is the difference between 12-hour and 24-hour format?
The 12-hour clock uses AM and PM to distinguish morning from afternoon/evening, cycling twice daily (12 AM to 11:59 PM). The 24-hour clock runs from 00:00 (midnight) to 23:59 (11 PM) once per day. The 24-hour format eliminates AM/PM confusion and is standard in healthcare, aviation, and military settings.