That varies according to which country you are in.
The average size 8 waist measurement in Australian clothing is 63cms. Each size increases by 5cms thereafter ..ie: size 10 is 68cms and size 12 is 73cms. Just keep in mind that the waist measurement still goes on the actual waist... not the lower position that pants are worn today. If you are buying pants on Ebay or such, it is best to measure the rise also... which is waist to crotch measurement. The best way to do this is to measure a favourite pair of pants rather than measuring yourself.
US size 12, UK size 16
In America a 23 inch waist equal size zero.
The UK size 16 is a 33-35" waist
27 inches
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The waist measurement of a size eighteen dress is ninety-three centimeters or 36.5 inches. The bust size of a size 18 dress is 109 centimeters or forty-three inches.
Your waist should be roughly half of your height so your waist size should be 30"-32".
40 inch is the waist measurement.
40 inch
The waist measurement for women's size 0 American Eagle jeans is 24.5 inches. This is based off the international size chart on the American Eagle website.