It's a little over 3" when locked in the lowest position. I am currently using this monitor but I have ordered a Dell 2405FPW, which should arive within the next week or so. If you are interested I am selling my 1905FP when the new monitor gets here. It is a little over a month old and has no dead pixels. You can have it for $350 shipped. If not it will go up on eBay eventually. Otherwise I am very happy with this monitor. It is a great deal for the price, I just wanted something bigger.