EVERYDAY MATH • FREE CALCULATOR

Time Duration Calculator

Calculate elapsed hours and minutes between two clock times using a clear worked example.

Elapsed time
8 hours 30 minutes
Total minutes
510

How it works

Subtract start time from end time; if end is earlier, assume next day.

Worked calculation

09:15 to 17:45 is 8 hours 30 minutes. For the sample inputs, the calculator displays these results:

Elapsed time8 hours 30 minutes
Total minutes510

Assumptions and limitations

This is an elapsed-clock calculation, not payroll advice.

Results update as you change inputs. The values are calculated from the displayed inputs and assumptions, not obtained from an external measurement. Check units, rounding, and any special rules that apply to your situation.

Related calculations

Methodology · About the publisher

Frequently asked questions

How is elapsed time computed?

The end time minus the start time, wrapping past midnight if needed.

What time format is used?

24-hour HH:MM.

Does it handle time zones?

No. Both times are assumed to be in the same zone.

Sources and further reading

Last updated: . Results are estimates for information only and are not financial, medical or professional advice.