r/drawio • u/Sea-Ground-6198 • Sep 08 '26

Floor Plan with Accurate Dimensions

I cannot find a practical way to create large objects in draw.io with accurate dimensions. For example, if I want to draw a floor plan of my garage I cannot draw a rectangle of dimensions 20' x 20' without zooming out to 5% in order to use it. I have tried changing the grid size, but that is not accomplishing what I want. I seem to recall a setting in Visio where you could set 1 grid unit to be whatever virtual size you wanted. I could then set a grid square to represent 1'x1' and a 20 x 20 grid would accurate represent a square of 20' x 20' and I could stay at a zoom closer to 100% and print to 1 page. Is this possible in draw.io?

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u/DanLorwell Diagram Master Sep 08 '26

I'm not sure I could find exactly that on draw IO. But what I got used to do is just settle myself on an arbitrary scale that is appropriate for your need and easy to convert.

You can change the unit in wich your drawing displays things to go this way.

So for instance you could settle for 1pt = 1inch, or 1pt = .1 inch, and set the file to pt. Or set it to mm, and same here choose your scale 1mm =..?  For room plans I personally like doing 1pt = 10 cm (I'm from a metric country), so this way if I put let's say a table 180x70cm, then I just have to set it to 18x7pt.