Hello,
Because of a bug that would be a bit complicated to explain. myObject.position (which is a Rect Transform) returns a weird value. However, myObject.anchoredPosition seems to return the correct value.
How can I convert it?
For reference, my Rect Transform object is a panel in my ScrollRect’s content.
Are you sure they’re “weird” or just not what you expected? 
anchored position might be want you want, I mean.
position is the world position, in meters. RectTransform inherits from Transform, so position is just the regular old position.
A confusing thing is that it’s often the position in pixels or very close (an 800x600 canvas is also 800 meters by 600 meters in the game world.) It’s off a little depending on the canvas scale and origin.