I ordered 10 ounce bowls, since the bowls I already had held 10 ounces when filled to the useful level that one would normally use for cereal or soup. When I received my bowls I found they were somewhat smaller, and when I measured the volume they held 10 ounces when filled right up to the absolute brim. Now who fills a bowl to the overflowing level? Answer, nobody. Apparently I should have ordered 18 ounce bowls, since that is how much the ones I already have hold when filled to the absolute brim. I think it would be much more useful for you to rate your bowls by diameter rather than capacity since there is no ambiguity. The bowls I already have are 6.25" in diameter at the top and the new ones I received are 5.5" in diameter. Otherwise the bowls are fine.