Azure provides a tool for estimating the cost of services, it provides various parameters for setting up your estimates, to make it as accurate as possible.
The cost of running a server is always more than the cost of the server itself, it will include the cost of things like Electricity, Internet, Space etc. This is known as the total cost. This is used to calculate the cost of running the services on Azure vs running the services on premise.
Tool for analyzing the spending, contains historical data for analyzing patterns for budgeting and reporting purposes.