What is the annual number of individuals a single farmer can provide food for?

Back in the 1930s, a single farmer in America was able to grow enough food to support four individuals, essentially feeding a family [source: Kirschenmann]. By the 1970s, this number had surged to 73. Thanks to advancements in agriculture and bioscience over the next 80 years, by the 2010s, one farmer could produce enough to feed 155 people [sources: USDA, Sullivan].

To grasp the significance of this figure and the methodology behind its calculation, it's essential to examine the present condition of farming.

To qualify as a farm according to the U.S. Census, a contemporary farmer must generate and sell a minimum of $1,000 worth of agricultural goods each year. Based on this criterion, there are 3.2 million farmers managing 2.2 million farms across approximately 915 million acres in the United States [sources: EPA - Ag Center, USDA]. These farms collectively grow crops for over 313 million U.S. residents, but their reach extends beyond the nation; American farmers export more than 50 varieties of agricultural products globally.

However, the process is more complex than it appears. Economists at the American Farm Bureau Federation determine the number of people one farmer can feed, and this figure isn't derived from an individual farmer's output. Instead, it's a ratio based on the production of each farm. Here's how the calculation works:

First, the farm bureau starts with some accounting. They compute the total cash receipts from American farm agricultural products (the revenue from sales and services) for a given year—let's call this X. Next, they deduct the trade balance (the difference between the value of exports and imports, or net exports) for the same period, which we'll label Y. The result of X minus Y is then divided back into X. This formula also factors in the U.S. population and the number of farms during that year [source: Sullivan].

Nothing's Perfect: Flaws in the Calculation

The method for determining how many people one farmer can feed annually relies on farm production rather than individual farmers, but this isn't the only limitation. The statistic is also incomplete because it doesn't differentiate between crops consumed by humans and those used for other purposes, nor does it consider food that never reaches consumers.

Not all agricultural products are meant for human consumption, yet this distinction isn't reflected in the Farm Bureau's data. For instance, corn, the largest crop in the U.S., sees about 40 percent converted into corn ethanol for gasoline. Another portion feeds livestock, leaving only around 12 percent for human consumption as corn chips or high fructose corn syrup.

Soybeans, the second-largest crop, face similar issues. While soybean oil is consumed by humans, nearly 47 percent is processed into soy meal for animal feed, totaling over 30 million tons annually [sources: EPA - Ag Center, Sustainable Table]. Soybeans also contribute to non-food products like crayons. For example, one acre of soybeans produces enough material for 82,368 crayons, and Crayola manufactures approximately 3 billion crayons each year [sources: Wisconsin Soybean Association, Crayola].

Additionally, a significant amount of food intended for consumption is wasted. Americans discard about 40 percent of the food grown by U.S. farms. While some of this is due to spoilage, 14 percent is still edible when thrown away [source: Gunders]. The issue isn't limited to consumers; farmers and retailers also contribute. In some years, up to 6 billion pounds of fruits and vegetables are left unharvested due to low demand or cosmetic imperfections. Retailers further exacerbate the problem by discarding around 43 billion pounds of food from their shelves annually [source: Gunders].

Variables: Farm Size

The Farm Bureau's statistic, being ratio-based, doesn't account for variations in farm size, the types of crops grown (or whether the farm focuses on crops or livestock), or the farming methods employed.

First, consider farm size. While it might seem logical that larger farms feed more people, the reality is more nuanced. A bigger farm doesn't always mean a greater contribution to food supply.

Across the 915 million acres of farmland in America, the average farm spans 434 acres, making it moderately sized. Farms are classified as large when they exceed 1,000 acres (with annual sales between $250,000 and $499,999, while sales above $500,000 are considered very large). Small farms average 231 acres, and very small farms are nine acres or less. These smaller farms dominate the U.S. agricultural scene, with 88 percent of farms being small and generating less than $250,000 annually [source: USDA].

Interestingly, small and medium-sized farms contribute more to human food consumption than larger farms. This phenomenon, known as the inverse farm size-productivity relationship, highlights that smaller farms in the U.S. and globally are more likely to focus on producing food for human consumption, such as crops or livestock. In contrast, larger farms often prioritize exporting commodities or growing non-edible crops like corn for biofuels or soybeans for animal feed. As a result, small farms play a larger role in feeding people.

The type of agricultural products a farm produces and the farming methods used also influence how many people the farm's output can feed.

Variables: Crops, Livestock and Farming Method

Beyond grains, fruits, and vegetables, American farmers also raise 7 billion livestock animals [source: Kellogg]. These animals consume five times more grain than humans. If these grains were redirected to human consumption, the number of people one farm could feed would increase dramatically, potentially feeding up to 800 million people [source: Pimentel].

Annually, livestock farms produce 7 million metric tons of animal products. Taking beef as an example: A single 700-pound cattle yields about 400 pounds of meat, including steaks, ribs, and other cuts, for consumers to grill or roast [source: Dole & Bailey]. Assuming a serving size of 3 ounces (the recommended portion, roughly the size of a deck of cards), one animal provides slightly over 2,100 servings. The exact numbers vary based on livestock-raising methods, such as grain-fed or pasture-raised.

Another important factor is the farming method used.

Setting aside the debate on whether organic foods are more nutritious than conventionally grown ones, the focus here is on yield. Studies show that organic farming methods generally produce lower yields compared to conventional techniques, which impacts how many people a farm can feed.

Before dismissing the findings, it's crucial to recognize that yields are influenced not just by farming methods but also by crop types and whether the comparison is based on ideal conditions or real-world results. Considering these factors provides a more accurate perspective: Organic yields can range from just 5 percent lower to as much as 34 percent lower than conventional yields.

In some cases, organic farming yields surpass conventional ones, particularly for certain fruits and vegetables [source: Gilbert]. For instance, organic corn yields are 29 percent lower than conventional corn, while organic raspberries outperform their conventionally grown counterparts [source: McWilliams]. Under optimal conditions, organic farming yields are 13 percent lower, but on average, organic methods result in 25 percent smaller yields [source: Gilbert].