How high is up?

Up is defined by what you are talking about. If someone says look “up”….then it’s anywhere right above eye sight and higher.

If a penny is on the ground and you want to pick it “up” then it’s above ground level.

Up is a direction not a distance. So it has no calculatable measurement unless you specify how high up the point which you are refering to is. But that’s a measure of height not direction.

the top of an object, as far as you can see looking up, or the top floor or roof of a building. In other words it can be 1mm to where the end of existence lyes. it mostly depends on who you ask.

high is as up as the heavens, look up to the sky but wear sunglasses so you don’t go blind!