This one lets you choose your volumes by buckets, wheelbarrows, pounds, cubic feet, etc.
Choose any four items and play with the numbers (in cubic feet) to get an idea of where you will find a good ratio.
Of course they are showing a cubic foot of wet food waste weighs 55 pounds. Our five-gallon buckets of materials from ThunderCloud, Monkey Nest and other don’t weigh half of that. Same for the coffee grounds.