It is emphasized that it is important for an enterprise to be aware of and, thus, plan objectively the amount of output per unit of area which will provide the required amount of revenue. Under these conditions the amount of revenue is compared to fixed costs born by the enterprise during the production of a particular type of crops. Based on a previously published method of gradation of agricultural crops, the article suggests a range of methodical approaches for increasing the number of crop yield metrics up to five which form six distinct zones: of critical, low, moderate, rational, optimal and high crop yield respectively. For this purpose, the work offers a number of formulas which allow enterprises to forecast the amounts of revenue per unit of area as a multiple of fixed costs. Suggested relationships are vividly presented on graphs. Furthermore, a number of examples of calculating different levels of crop yield based on a case of a particular enterprise in year 2015 are provided.