How to use this Time Duration calculator
Working out how many hours and minutes lie between two times sounds simple until shifts cross lunch breaks, billing windows or midnight. Getting it right matters for timesheets, invoices and daily planning.
This calculator finds the duration between a start and end time in hours and minutes, removing the mental arithmetic from shift, billing and schedule calculations.
How the duration is found
The calculator converts both times to minutes, finds the difference, and expresses it back as hours and minutes.
This avoids the common slip of subtracting minutes and hours separately, which goes wrong whenever the end minutes are smaller than the start minutes.
Common uses
Use it to total work shifts, compute billable consulting hours, measure study sessions, or plan travel and event timings.
For payroll and freelance billing, an accurate duration ensures you are neither under- nor over-charging.
Crossing midnight
When an end time falls on the next day, the raw subtraction can look negative or wrong.
For overnight periods, account for the day change so the total reflects the real elapsed time.