Hours calculator: add, subtract and convert
Add work intervals or other durations in h:mm format, use a minus sign to subtract an entry, and convert a duration to or from decimal hours. This is a time arithmetic tool; it does not calculate payroll, overtime or legal work-hour balances.
Add or subtract times
Convert h:mm and decimal hours
Minutes as decimal hours
- 15 minutes = 0.25 hours
- 30 minutes = 0.50 hours
- 45 minutes = 0.75 hours
- 6 minutes = 0.10 hours; divide minutes by 60 to convert them.
Why minutes are not decimal fractions of an hour
An hour has 60 minutes. To convert h:mm to decimal hours, divide the minutes by 60: 7:48 is 7 + 48/60 = 7.8 hours. To convert decimal hours to h:mm, multiply the fractional part by 60; 7.5 hours is 7 hours and 30 minutes.
Use the result carefully
This tool adds elapsed durations. It does not know a shift schedule, breaks, premiums, local employment rules or how an employer rounds time. Check the applicable records and rules before using a result for payroll or a formal time balance.
Frequently asked questions
Is 0.5 hour the same as 50 minutes?
No. 0.5 hour is 30 minutes because 0.5 × 60 = 30.
Can I subtract a duration?
Yes. Start a line with a minus sign, such as −0:30, to subtract 30 minutes from the total.
Does this calculate overtime pay?
No. It only adds, subtracts and converts durations. Pay calculations depend on schedules, agreements and applicable rules.