Please view this USDA produced video for instructions on how to use both the web and mobile app versions of the USDA's ounce equivalents calculator (commonly referred to as the "Exhibit A Grain Tool" ). This easy to use tool will be very useful in helping you figure out the minimum portion size when you serve a grain that is not listed on the ounce equivalents measuring chart provided below. The Exhibit A Grain Tool is available in the USDA's electronic food buying guide which is available on the web and as an app for both Android and IOS devices. See the articles above for more details.