For example, if you have an image that’s 8. 5" x 11" (21. 4cm x 28cm): To scale the drawing size up 2x, the paper should be 17" X 22" (43cm x 56cm). To scale the drawing size down 0. 5x, the drawing paper should be 4. 25" x 5. 5" (10. 7cm x 14cm).
Note that in the example image, because one-inch markings were used, there is a quarter-inch (0. 64cm) marking at both the upper and lower half of the drawing, since the height is 8. 5"/21. 4 centimeter (8. 4 in). These two quarter-inch markings account for the extra half-inch. Depending on the size of your paper, you may have to do this as well.
