>>329038923
Once it's in unity, it is measured in metric. Making a cube next to the avatar, that cube is 1 metre, at 1x scale. If you want to scale it to the avatar, you scale it on the Y axis and then add half of the Y axis to the Y position so the cube still sits on the floor.

Since I'm 1.76 metres tall, I can make a cube that's 1.76x scale on the Y axis and make the Y position .88, I can scale my avatar to that cube to make it my RL height, for example.

Most avatars are roughly one and a half metres in height by default.