I am no expert at "Punch around the page" by Martha stewart (as you will know if you have read my last post). BUT this is what I did (mind you it was after quite a bit of wasted card trying to get it right)!
I punched the corner then measured it to see how big it was, then measured the border bit once that was cut then the next corner and then added it all 3 up. (Don't know if that makes sense)! E.G. 1"+2"+1"=4", so cut the card at 4" to see how far out I was.
Yesterday on QVC Alex (Martha's right hand man) said It goes up in 2" incriments, but let me tell you....NO THEY DON'T!! Or at least the one I was using doesn't.
The Pansy punch I used cut at 3 1/4 and then the one on my last card which was 5", so my advice is to try what I said above with old card and when you get it right, save it write the size on it and get it out next time you need to. I have a feeling they are all NOT going to be the same, so you may need to do them for all your others....Good Luck.