Our Mulches and stone are sold by quantity of our 60” tractor bucket. Since we cannot accurately measure these by the “yard” or do we have a scale to weigh it. So when calculating needed amounts, we will do our best to estimate with the square footage of your area. We tend to recommend that one scoop of the tractor covers about 75 sq/ft. This depends on product size and how deep you go, along with new installs versus fresh covering. This does not count for black dirt, dirt compacts significantly and coverage is dependent on use.