Time calculator
Time Duration Calculator
Find the elapsed time between two decimal-hour clock times.
Use 0–24 decimal hours. An end earlier than the start is treated as the next day.
Duration
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How it works
Times use decimal hours from 0 through 24. When the end is earlier than the start, the calculator treats it as the following day.
Duration = (end − start + 24) mod 24
Worked example
From 22.5 (10:30 PM) to 1.25 (1:15 AM), the duration is 2 hours 45 minutes.
How to use this tool
- Enter the known values and choose units where available.
- Check the primary result and supporting details.
- Clear or replace an input to calculate another case.
Frequently asked questions
What happens with invalid or incomplete inputs?
The result remains blank until the required inputs form a finite, meaningful calculation. Zero denominators and physically impossible negative quantities are not calculated.
Can I use decimal values?
Yes. The tool accepts decimals and keeps full precision for the calculation while rounding the displayed result for readability.