How to convert from oral paliperidone or risperidone to paliperidone palmitate 1-month LAI

Question from a Member (emphasis in red added by us): I have a middle-aged patient with schizoaffective disorder who is stable on risperidone 3 mg/day. I want to give her a long-acting injectable (LAI) antipsychotic. What is a reliable conversion from oral risperidone to paliperidone palmitate (Invega Sustenna®)? For someone who is stable on oral…