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What is the standard size of a floor plan?

There are two ways to read this question. If you mean the paper or file size, residential floor plans are most commonly printed on Arch D (24x36 inch) or Arch C (18x24 inch) sheets, drawn at a scale of 1/4 inch = 1 foot for residential work. Smaller marketing floor plans in real estate listings are usually letter-size PDFs or images with no fixed scale.

If you mean the size of a typical home, the median new single-family home in the US is roughly 2,200 square feet, though this varies widely by region and era. Older homes often run 1,000-1,600 sq ft.

Because marketing floor plans are rarely printed to a true scale, you can't measure them with a ruler reliably. The fix is to calibrate the image digitally: MeasureFloorPlan lets you set the scale from any single known dimension on the plan, such as a labeled room or a standard 3-foot door, and then every measurement you trace is accurate regardless of the image's print size or resolution.