Rigify — Blender Manual
Note. Rigify assumes that 1 unit corresponds to 1 meter. So a human is about 2 units tall. If your character is in a different scale and you are more familiar with modeling rather than rigging, it is suggested to scale it to Rigify dimensions before positioning the metarig bones. f you want to scale the character's geometry, we suggest you to first scale up the character in Object Mode ...