Hi!
Depends where you export FBX…
3DS Max export FBX → there is setting Advanced Settings → Units. That makes some scaling.
Example i got house with metric units made, so 1 meter is 1 meter.
When i export it out of 3DS Max i set scale factory for centimeters and that seems to fit just right in UE4…
In Blender, when you export and give name of file.
There is lower left corner scale setting field.
Most common times when i have exported stuff out and imported it some game engine with FBX there is scale rate something like 0.01 so if you put scale like 100 should be close enough…
Exporting Blender you need to apply Scale, before export.
Crtl + A = apply scale.