Real world scale size? I am working on a project that's a bathroom, it's supposed to fit real world scale, the size of the bathroom should be 2,50х1,5 and the height 2,2. How am I supposed to use these numbers in Blender in order to get the size right?
Start with a cube, enable the measurement overlay so that you can see the dimensions of the object. 



Scale the object to the size you need.