CAD Unit & Drawing Scale Converter
Convert length units and drawing scales exactly, built for AutoCAD, Revit and SolidWorks learners.
Length converter
Feet and inches to millimetres
Drawing scale calculator
Why CAD students need this
Drawings are made at one scale and read at another, and sites, workshops and standards mix metric and imperial units. A wrong conversion is one of the most common beginner mistakes in AutoCAD, Revit and SolidWorks. This tool converts between common length units and between drawing length and real length, using exact factors (1 inch = 25.4 mm).
What is a 1:50 scale?
One unit on the drawing stands for 50 of the same unit on the real object, so a line 20 mm long on the drawing is 1000 mm (1 m) in real life.
Which units does AutoCAD use?
AutoCAD drawings are unitless until you set the drawing units, so decide on millimetres, metres or inches before you start and keep to it. Our AutoCAD course covers units, limits and scale.
How many millimetres are in a foot?
One foot is exactly 304.8 mm, and one inch is exactly 25.4 mm.
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