Calculations are based on the below logic :
• Start/End dates of the Sprint are taken in consideration
• Then the capacity of the resource(s) defined in the template is taken
• The Focus value of each resource is also taken into account. For eg if Focus is 0.5 and capacity is 8hrs per day, then it is assumed that the resource will spend 8 * 0.5 = 4hrs per day in the sprint
• Remove any non working day defined in team settings (for example Saturday/Sunday)
• Remove any team holiday(s)
...