Resolution, fit to screen, fit to page

I am very far from being a graphical artist designer.  One thing I notice is there is no fit to page or fit to screen option in SSRS.  Also, SSRS works in inches or centimeters.

I therefore wonder if poeple have method of handling clients expectation with regards to this.

i.e. do you specify how many inches it should take on specific resolution (using printer and screen regular resolutions) or is there a more elegant way to state that.

For instance: Report will be designed to fit on 10 inches wide with 1/2 inch margin wide on a 1280/1024 screen or a xyz/xxx printer resolution?

Is there a more elegant solution?  If you believe this is a recipe for disaster, let me know as well.

Thanks!