I would like to iterate calculate field in multiple tables using ArcGIS Model Builder.
The figure below explains details of the calculations. My existing model calculates value only for the first table.
Any direction would be valuable.
[GIS] Iterate calculate field in multiple tables in ModelBuilder
arcgis-desktopfield-calculatoriterationmodelbuildertable
Related Solutions
Have you tried to use Add Field twice? First for fc1 and then another block for fc2.
Add Field tool accepts only single table/feature class as input.
It will look similar to: 
If you have many feature classes and want to add field to each of them then you can use iterators in ModelBuilder (take a look at "Iterate Datasets" section) or convert to python script and use loops if you are convenient with python.
I remember struggling with this in ModelBuilder as well, and the method I eventually came up with is this:
An expression is built using the Calculate Value tool with Value as an inline variable. It will return a string containing the current Value which can be used as the expression for the Calculate Field tool.
Best Answer
ModelBuilder only allows one iterator per model. I would integrate a model within a model in order to iterate over multiple tables.