One of the trickier things to do in Flutter is to get the size of things. Generally there are 3 use cases you might have: Measure your own context Measure your parents contextMeasure a child context The first 2 are quite simple so we’ll just skim them. The 3rd is more interesting. Measure your own size To get your own size, you can just do: Note: The first time this runs the size will be zero, Flu