This tool, developed by the Leopold Center for Sustainable Agriculture, allows users to compare what Iowans eat to what Iowa farmers produce. The calculator is designed to "help users determine expanding markets in Iowa if consumers ate more locally grown fresh fruits and vegetables rather than produce from conventional sources outside the state."

For example, by selecting the options "demand," "apples," "farm revenue," and "per year," one can see that Iowans demand $6,496,000 worth of apples per year (the demand for each Iowa county is also available). Then, by selecting "market capacity," "apples," "farm revenue," and "per year," one can see that 50% of Iowans' consumption of apples is from local producers.

The calculator is available at http://www.leopold.iastate.edu/research/calculator/home.htm