Calculator form size

Designing a scientific calculator in Ms Access,I'm almost done with the calculator VBA in Ms Access. The current issues that I cannot sort out are below:

(1) I want the form size to open like the size of a pocket calculator, I want this form to be used as a calculator on all sales & purchases forms in ms access


Is there a code or something that can reduce the size of the form? in design format I'm able to that , but when I open the form it fills the whole screen, that what I do not want.

(2) the form must be called from the sales invoice form and appear like a calculator, I want the simple method of calling it like using a macro or VBA ( Do.cmd) , is it possible?

I have assembled a called for calculator , like the one we use in C#


Regards

Chris