THE MATH, WITHOUT THE MYSTERY
How the rectangular grid estimate works
The calculator first removes the outer margin from all usable edges. It then tests the design upright and rotated 90 degrees. For a fixed sheet, the selected grid is the orientation that fits the most repeated rectangles. For roll media, it selects the orientation that needs the least continuous length. Exact fit decisions use the unrounded input values.
columns = floor((usable width + spacing) ÷ (design width + spacing)) rows = floor((usable length + spacing) ÷ (design height + spacing)) Only the spaces between neighboring designs receive spacing; the outside safe edge comes from the margin. Job utilization divides the rectangular bounding-box area of all planned prints—including intentional extras—by all purchased sheet or roll area. Unused media area includes margins, gaps, and incomplete rows or sheets. Transparent pixels inside a design's bounding box still occupy layout space, so this estimator does not count them as reusable media.