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What size should a floor plan be?

For printed architectural drawings, residential floor plans are typically drawn at 1/4" = 1' scale on Arch D (24x36") or Arch C (18x24") sheets, which fits most houses with room for dimension lines and notes. Larger buildings drop to 1/8" = 1' to fit the sheet. For real estate marketing, floor plans are usually letter-size (8.5x11") PDFs or web images around 800-1600 pixels wide, prioritizing readability over measurability.

For digital use, resolution matters more than nominal size: a floor plan image should be sharp enough that wall lines and dimension text are clearly legible, generally 150 DPI or better if scanned.

One important consequence of all this: marketing-size plans almost never hold a true printed scale, so you can't measure them with a ruler. Any resized, screenshotted, or compressed image has lost its scale relationship entirely. The solution is calibration rather than print size. MeasureFloorPlan works with any image dimensions because you set the scale from a known measurement on the plan itself, making even a small listing thumbnail measurable if the lines are legible.