What Is 30 Minutes in Decimal Hours?
Thirty minutes equals 0.50 decimal hours because 30 ÷ 60 = 0.5. In decimal-hour notation, half an hour is written as 0.50, not 0.30.
Practical timekeeping guide · ShiftHours
Calculate 30 minutes
Divide the minutes by 60: 30 ÷ 60 = 0.5. For a duration of 5 hours 30 minutes, add 5 + 0.5 to get 5.50 decimal hours.
The trailing zero in 5.50 can be useful when a timesheet consistently displays two decimal places.
Examples for common shifts
A 7-hour shift plus 30 minutes is 7.50 hours. A 9-hour-30-minute duration is 9.50 hours. If a shift lasts 8 hours 30 minutes but includes a 30-minute unpaid break, net time is 8.00 hours.
Calculate the break-adjusted duration first, then convert to decimal hours.
Avoid the clock-time mistake
Clock notation 7:30 means 7 hours and 30 minutes, which equals 7.50 decimal hours. The decimal number 7.30 means 7 hours plus 0.30 of an hour, or 18 minutes.
This distinction is one of the most common sources of errors when transferring time into spreadsheets or payroll systems.
Keep conversions consistent
Use the same number of decimal places throughout your timesheet and apply rounding only as required by the relevant system or policy.
For additional examples, see converting decimal hours back to minutes.
Use the free ShiftHours work hours calculator to calculate shift length, subtract unpaid breaks, and view decimal hours. For weekly totals, try the weekly calculator.
Quick calculation: 30 minutes
Thirty minutes is half an hour: 30 ÷ 60 = 0.50. Therefore, 7 hours and 30 minutes is written as 7.50 decimal hours. The decimal point represents a fraction of an hour, not minutes.
Related resources
Open the work hours calculator · Browse all ShiftHours articles · Decimal hours chart