You can either use a scale ruler to hand draw your plans or software such as revit autocad archicad.
Scale floor plan autocad.
Autocad import raster image scale for tracing autocad 2012 duration.
Once you gain an understanding of scales it is easy to understand which scale is most suited to which type of drawing.
After inserting an image or importing a pdf file often time the objects and dimensions will not show their true length being that the image is not at a 1 1 scale with the actual drawing units.
For example it is common practice to produce floor plans at a scale of 1 100 dependent on size of project and paper.
The drawings are then plotted or printed at a plot scale that accurately resizes the model objects to fit on paper at a given scale such as 1 8 1.
In other words a 12 foot wall is drawn at that size.
Autocad 2d drawings are commonly drawn in model space at a 1 1 scale full size.
Select the scale tool from modify panel of the home tab or use its command sc.
In this autocad video tutorial series i have explained steps of making a simple 2 bedroom floor plan in autocad right from scratch.
Autocad 2d basics tutorial to draw a simple floor plan fast and efective part 1 duration.
Using scale command you can change the size of an object in autocad.
Among the reasons are user errors.
In some drawings data in model space hasn t been drawn at a 1 1 scale.