Free tool
Imposition calculator
How many pieces fit on your sheet? Enter the piece and the sheet. Get the best layout, the sheet utilization, and how many sheets your run takes. Same math our engine uses on real plates.
This calculator tells you the layout. Plateroom builds it. Drop your file, type "gang on 12x18," and download the plated, crop-marked, press-ready sheet in seconds.
Try it freeHow n-up imposition math works
For each orientation, the sheet's printable area (sheet minus margins) is divided by the piece size plus the gutter: columns = floor((printableWidth + gutter) ÷ (pieceWidth + gutter)), same for rows. The calculator tries the piece upright and rotated 90° and keeps whichever fits more. Utilization is the finished-piece area times the count, divided by the total sheet area. The rest of the sheet is margins, gutters, and trim-off.
Common results: business cards (3.5×2) run 24-up on 12×18 at 78% utilization; 4×6 postcards run 8-up; 5×7 invitations run 4-up. On DTF gang sheets, rotate-and-pack matters even more: a 22×60 roll holds 40 of a 4×5 transfer with a 0.5" gutter.
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More free tools: EDDM size checker