Blueprint Scale Guide and Calculator

A free browser tool and guide from Print My Plans that explains common architectural and engineering drawing scales, such as 1/4 inch = 1 foot and 1:100, and lets you convert between a measurement on a plan and its real-world size. It helps architects, contractors, students and homeowners read printed plans correctly and check that a drawing will stay to scale on 18x24 to 36x48 sheets. No signup needed.