Set image size for saving a figure

Hello,

In reports I use a lot of matlab-generated plots, but I always have to rescale a saved image of a plot to fit nicely into my document window. I end up with plots that show inconsistent font sizes.

Is there a way to have the plot function create a figure that already has the right standard size? I've tried, to no avail:

        set(gcf,'Units','centimeters'); xSize = 15;

Thanks!