Can Anyone Tell Me How?

im trying to take a drawing that i done in pencil and colored pencil thats on a 8.5x11 sheet of paper and i want to transfer that drawing to a 12x16 canvas to do the same thing in oils. and my printer doesnt handle that big of paper to just print it out to do a graf. i know that thares some math in volved but i have no idea on how i would do it. if any one could help please do, this has been plaugeing me for a couple of days and i havent found anything on the web to help thus far. thanks

also if anyone has any cool was to transfer a line drawing to canvas id love to hear about it.