A4 · Portrait
210 × 297 mm · ISO 216
Imperial 1/4" square grid - the legacy North American floor-plan workhorse.
A 1/4 inch (6.35 mm) square grid pre-calibrated so each cell represents one foot at the classic North American residential plan scale of 1/4" = 1'-0". Bold every-fifth-line hatching gives a 5-foot reference rhythm familiar to American residential architects and the building-permit reviewers they work with. Further reading: A practitioner reading list covers the standards lineage in more depth.
Scale ratio matches the recommended residential scale in ANSI Y14.1 informational guidance.
1/4" = 1'-0" plans have been the residential default in the United States since the early 20th century, predating widespread adoption of metric scales.
Every variant on this page is delivered as a vector SVG with physical millimetre dimensions baked into the file, so a compliant printer driver will reproduce it at exact 1:1 scale by default. Choose the sheet size that matches your printer tray, set scaling to 100 % (never "fit to page"), and verify with the calibration check on our how-to-print guide. Buyer's guide: Comparing the major architectural scale rulers can help you pick the right physical scale rule to use over the printed grid.
210 × 297 mm · ISO 216
297 × 210 mm · ISO 216
297 × 420 mm · ISO 216
420 × 297 mm · ISO 216
420 × 594 mm · ISO 216
594 × 420 mm · ISO 216
216 × 279 mm · ANSI A
279 × 216 mm · ANSI A
216 × 356 mm · US Loose
356 × 216 mm · US Loose
279 × 432 mm · ANSI B
432 × 279 mm · ANSI B