Time Duration Calculator
Calculate the duration between two times of day.
A time duration calculator finds the hours, minutes and seconds between a start and end time (24-hour HH:MM format).
How to Use the Time Duration Calculator
- Enter start time. Type the start time in 24-hour format.
- Enter end time. Type the end time.
- Read the duration. See hours, minutes and seconds.
This tool processes your input locally in your browser. Nothing is uploaded.
What Is Time Duration?
A time duration calculator computes the elapsed time between two points in the day, useful for shifts, sessions and schedules.
How it works
Times are entered in 24-hour HH:MM (or HH:MM:SS) format and converted to seconds, then the difference is converted back to hours, minutes and seconds.
Key Features
- Hours, minutes, seconds
- 24-hour format
- Clear errors
Examples
- From 09:30 to 17:45 is 8 hours 15 minutes.
Common Use Cases
- Work shifts
- Meeting durations
- Schedule planning
Tips & Best Practices
- Use 24-hour format to avoid AM/PM ambiguity.
Limitations
- For overnight spans, enter times as dates instead.
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Frequently Asked Questions
How do I calculate time duration?
Convert both times to seconds and subtract, then convert back to hours/minutes/seconds.
What format should I use?
24-hour HH:MM format, e.g. 14:30.
Is it free?
Yes, and it runs locally.