Refresh Excel cell value that has a formula

Does anybody know of any extension that is able to read a cell from an excel file that is using a formula? Example I input a value in cell 1.  the value in cell 2 is automatically re-computed.

Hello Lawrence,

Can you be more specific about your requirement.

What I've understood is you need extension, but for what? 

The value in the cell 2 is automatically re-computed? but on what criteria??

(Ignore if that was not what you are asking for, or you mean something else and clear about that but I failed to udnerstand)