Format profile / ARCH-C
Arch C
457.2 × 609.6 mm · 18 × 24 in
Width
457.2 mm
Height
609.6 mm
Area
2,787 cm²
Finished-size ledger
Pixel canvas by resolution
rounded to whole pixelsBleed and safe-area canvases
confirm with your printer3 mm on every edge
463.2 × 615.6 mm
Artwork canvas with bleed. Keep essential content inside roughly 451.2 × 603.6 mm if the same distance is also used as a simple safety margin.
5 mm on every edge
467.2 × 619.6 mm
Artwork canvas with bleed. Keep essential content inside roughly 447.2 × 599.6 mm if the same distance is also used as a simple safety margin.
Closest standard formats
both edges comparedWhere Arch C fits
1 common usesNext in the North America drawer
larger / smallerSet up Arch C artwork without guessing
Start the document at the finished size—457.2 × 609.6 mm—and add the bleed your printer specifies outside that edge. A common 3 mm bleed produces a 463.2 × 615.6 mm artwork canvas. Keep type, logos, folds, and other critical details inside the trim line; a safety margin is not the same thing as bleed.
Pixel dimensions only become meaningful when paired with a resolution. At 300 DPI, this format is 5,400 × 7,200 pixels. Changing that number in an export dialog without resampling does not add image detail—it only changes the declared physical scale.
Arch C belongs to the North American group. Its 1:1.333 proportion differs from the ISO √2 family, so moving an existing layout to A-series paper can change margins, line length, and page count.