Site Plan Scale Guide: Measure PDFs, Images and Printed Plans

Understand common site plan scales, verify a PDF scale bar, calibrate an image from a known dimension, and avoid measuring a plan that was resized during printing.

Verify before measuring

Calibrate against the longest trustworthy printed dimension and confirm a second direction when possible.

Printing can change scale

Fit-to-page and printer margins resize drawings, so verify the scale bar on the actual output being measured.