Hi Sean, the thinking here is that most digital scales have the option to use grams which I prefer because even small quantities can be measured in whole numbers. For example if I'm adding 2 grams of a spice to something it's weird calling for .07 ounces of it. The volumetric measurements are in US cups, but they'll be much harder for US readers to convert since they aren't going to have metric cups laying around. By the way, most of our recipes have a function to convert between metric and imperial in the recipe card. This was an old one without the conversion function but I've added it in.