Hours:minutes and decimal hours
One hour 47 minutes is 1:47 in hours:minutes, or 1.7833… in decimal hours. Entering 1.47 in a decimal-hours field records less time.
Rounded up to six-minute increments, it becomes 1:48 or 1.8 hours. If your timesheet defines one unit as one hour, enter 1.8 units. In that system, 0.1 unit is six minutes.
Round each entry or the total?
At six-minute increments, two 7-minute calls round up to 12 minutes each: 24 minutes billed. Combine them first and the 14-minute total rounds up to 18 minutes. Agree which method applies before invoicing.
Calculate charges before rounding decimals
Ten minutes is 0.1666… hours, displayed as 0.17. Use billed minutes ÷ 60 × hourly rate to calculate the charge, then round the final amount.
For example, 20 minutes at 240 an hour costs 80.00. Using the displayed 0.33 hours instead gives 79.20.



