Auto Calculate Hours Worled with Start and Stop Time
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Calculating hours worked between start and stop times is essential for accurate time tracking, payroll management, and project scheduling. This calculator automatically computes the total hours worked based on your input times, handling overnight shifts and multiple days if needed.
How to Use This Calculator
Using our hours worked calculator is simple:
- Enter the start date and time in the first field
- Enter the stop date and time in the second field
- Click "Calculate" to see the total hours worked
- Review the detailed breakdown of your work hours
The calculator handles all time calculations automatically, including:
- Overnight shifts that cross midnight
- Multiple day work periods
- Different time zones if specified
- Break time exclusion if needed
Formula Used
Time Difference Calculation
The calculator uses the following formula to determine the time difference between two points:
Total Hours = (Stop Time - Start Time) / 3600000
Where:
- Stop Time and Start Time are in milliseconds since epoch
- 3600000 is the number of milliseconds in one hour
- Negative results are converted to positive values
For more complex scenarios, the calculator may use additional steps to account for:
- Daylight saving time adjustments
- Time zone conversions
- Break time exclusions
- Overtime calculations
Worked Examples
Example 1: Standard Work Day
Start Time: 9:00 AM on Monday
Stop Time: 5:00 PM on Monday
Total Hours: 8 hours
Example 2: Overnight Shift
Start Time: 10:00 PM on Friday
Stop Time: 6:00 AM on Saturday
Total Hours: 8 hours
Example 3: Multi-Day Work Period
Start Time: 8:00 AM on Monday
Stop Time: 4:00 PM on Wednesday
Total Hours: 48 hours
Note
The calculator automatically accounts for all these scenarios without requiring additional input from you.
Frequently Asked Questions
Our calculator uses precise JavaScript time calculations that are accurate to the millisecond. The results are as accurate as the times you input.
Yes, the calculator can handle time zone differences if you specify them in the input fields. Simply include the time zone information when entering your times.
The basic calculator shows total time between start and stop. For break calculations, you would need to subtract break time from the total.
Yes, once you have the total hours worked, you can compare it to your regular work hours to determine overtime.