The kesuba is valued at “200 zuz”. The Chazon Ish says that is 570 grams of silver, or slightly over a pound of silver. Ashkenazic kesubas also add an additional value to the kesuba of “200 zazukim of silver”. The Chazon Ish values this at 127 pounds of silver, while Rav Moshe values this at 100 pounds of silver.
The idea was a monetary value to support a single person for one year. That is the full extent of “alimony”. The amount specified in the kesuba.