Export to .svg scale?

When I export to .svg then bring it into inkscape, I never get the same size objects twice. It seems to export according to how far the entities are zoomed to, eg. I draw a 5" diameter circle, export, it can be any size possible, how can I make it the true size? Thanks...
32+ years using Autocad, wanting to fully learn iCad and share my knowledge of applicable crossover info from Acad.