Unit Converter
Duration Calculator
Calculate elapsed time between a start and end clock time.
Formula and usage notes
duration minutes = end time minutes - start time minutes; add 24 hours if the end time crosses midnight.
Calculate elapsed time between a start and end clock time.
Practical examples
09:15 to 17:45 is 8.5 hours or 510 minutes.
Cross-midnight times are treated as ending the next day.
Use the date calculator when dates also matter.
Frequently asked questions
What inputs does this calculator need?
Start hour, Start minute, End hour, End minute.
How should I round the result?
Keep extra digits while comparing values, then round for the final decision or report.
Can I reuse the result in another calculation?
Yes, but preserve the original inputs and units so the next calculation stays traceable.