Calculators
Time Duration Calculator
- Browser-based
- No signup
Enter start and end times for work shifts or timesheets. Overnight shifts are detected automatically when the end time is earlier than the start time. Results include hours, minutes, and decimal hours.
100% Client-Side
Your data never leaves your computer.
How to use this tool
1. Enter a start time and end time on the same day, or enable overnight span if available. 2. Click Calculate duration. 3. Review hours, minutes, and total minutes in the results panel. 4. Adjust inputs for break deductions if your form supports them. 5. Use for timesheets or event planning—not payroll compliance on its own.
Worked example
Example: 9:00 AM to 5:30 PM on the same day gives 8 hours 30 minutes (510 minutes).
How it works
Enter a start and end clock time. If the end time is earlier than the start time, the calculator treats the shift as overnight and adds 24 hours. Results show hours and minutes plus decimal hours for timesheets.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
What if my shift goes past midnight?
If the end time is earlier than the start time, the calculator treats it as an overnight shift and adds 24 hours.
What are decimal hours?
Decimal hours express duration as a fraction of an hour, such as 8.5 for 8 hours 30 minutes, which is useful for timesheets.
Does this include dates?
No. It compares two clock times within a 24-hour period, including overnight shifts.
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