From the floor to the top of the harp. There are several interlocking pieces, so it won't take long to reassemble upon receiving. If I dissemble it, it may not work again because I will have disconnect wires, and you will probably have to get it rewired.
To be fair, the piece should be rewired regardless, this was made into a lamp a long time and ago and electrical codes have changed through the years, so in my opinion all older lamps should be taken to a lamp shop and be rewired. I also have Blue and White vases, other Larger vases and jars, Ginger Jars, and Cloisonne vases, check my other listings.