when I print paper models I copy/paste the papermodel image on office word, I zoom in/out 'til the page is real size (I put an actual sheet over the monitor to see if the size is ok), now that I see the size they will be printed I just grab a figure and resize the the image as I see fit,
also, that way you could manage to crowd the page with other models, that way you don't waste many sheets, but that's just me

edit: I've just seen the boxes, they say 1" haha, so question answered