The hem at the bottom is about 12 yards around. The tier above that is about 6 (half) the tier above that is about 3 (half again) and the top waist tier is about 1.5 (half again).
I used I think five/six yards of material total. Lots of piecing together. Does that help?
A teensy bit of criticism though but it's totally just my opinion - but the first tier seems a little bit too narrow for my liking. When it comes to my tribal skirts I think a wider first tier flatters the shape and doesn't make the skirt look "stuck" when you lift it. Other than that it's gorgeous!