This video highlights the problem and demonstrates the methods to solve the issue: That's It.

Watch this video (at 2:24) to see the export process for a rigged character with an armature. Set Apply Scale dropdown to ' FBX Units Scale'.If you have nothing else in the scene other than the armature and mesh object you can skip this step, otherwise, select only the armature and the child mesh character object (use shift to select multiple) and tick 'Selected Objects' in the FBX export window.Press Ctrl+A and Apply Rotation (the X axis rotation should now be 0 for the child mesh object).Select the child mesh of the armature containing your character (it should show a rotation of -90 degrees for the X axis).Rotate the armature to 90 degrees on the X axis (do not apply rotation!).Press Ctrl+A to and select Apply > Rotation.Rotate the armature to -90 degrees on the X axis.Select the armature (the mesh should already be a child of the armature).If you want to accelerate this process, especially if you are making many objects, have a look at this post where I have made a Unity Batch FBX Export addon for Blender! For rigged characters with armature and bones Go to step 1 and repeat process until all objects are exported.Move the the object to position 0,0,0 in your scene if it isn't there already.Watch this video (at 1:01)to see it in action For multiple simple objects Tick !EXPERIMENTAL! Apply Transform checkbox.(Simple object = no hierarchy and no armature (bones) or animations) For now, however, I strongly recommend sticking to 2.79.ДЇirst of all, if you are impatient like me, here's a quick summary of the easiest way to get rotation and scaling right: For a simple object Once a stable and reasonably bug-free version of 2.8 is available, I will publish an update. But wait - why not Blender 2.8? Even though Blender 2.8 has been in development for a long time, much of it is a complete re-write and the current beta is not yet stable enough to work with for a decent workflow. You can do all your setup and grey-boxing, then very quickly export things to digital content creation tools (DCC), such as 3ds Max, Maya or Maya LT, have the artists finalize the content, and safely merge your changes back into those Assets to continue your work in Unity.Have you ever been frustrated when exporting FBX files from Blender and importing them into Unity? Problems with rotation and scaling along the way? In this post I will provide you with some tips and tricks to get the Blender to Unity process working smoother. By doing this, it enables you to round trip very easily and save loads of time. The Exporter enables Autodesk tools to be aware of your Unity project and the location of your Assets folder. The FBX Exporter package makes it smooth and easy to send geometry and animation from Unity 2017.3 or later, to any application that supports FBX, and back again with minimal effort. The Unity FBX Exporter is available in Preview via the Package Manager from versions 2018.3 and up. The built-in Unity FBX Importer provides support for:ДЄnimation and animated custom properties (when present in the FBX file)

How to export out as an fbx unity