Calculating the IT outsourcing costs involves several steps. First, identify the specific services or functions to outsource. Then, consider factors such as labor, equipment, materials, and overhead costs. Request quotes from outsourcing providers and compare their pricing. Don't forget to take the hidden costs into account, such as transition expenses and quality control. Finally, evaluate the total cost of outsourcing versus the potential benefits and consider the overall ROI in order to make an informed decision.