Time Duration Calculator
Find the length of time between two clock times.
Results update as you type.
About this calculator
A time duration calculator works out how long there is between two times of day, given in 24-hour HH:MM format. If the end time is earlier than the start, it assumes the period runs past midnight into the next day. The result is shown in hours and minutes, as decimal hours, and as a total number of minutes.
Frequently asked questions
What if the end time is before the start time?
The calculator treats it as an overnight period and adds 24 hours. A shift from 22:00 to 06:00 is therefore counted as 8 hours, not a negative span.
Why show decimal hours?
Decimal hours (for example 8.5 instead of 8 h 30 m) are what payroll and billing systems use, since you multiply them directly by an hourly rate.
Why show decimal hours?
Decimal hours (for example 8.5 instead of 8 h 30 m) are what payroll and billing systems use, since you multiply them directly by an hourly rate.
Results are estimates for general guidance only, not financial, medical or tax advice.