It is possible to find charts with carbohydrate counts online on sites such as SparkPeople or the University of Pittsburgh Medical Center, as of 2015. These particular charts show measurements of foods that equal 15 grams of total carbohydrates, which roughly corresponds to one serving for a diabetic.
The SparkPeople diabetic carbohydrate count chart displays common food choices by category, including grains, legumes, starchy vegetables, fruits and dairy products. The University of Pittsburgh Medical Center website features a general conversion guide to be used with any carbohydrates. It shows increments of total carbohydrate grams and their equivalents in different types of foods, which allows diabetics to estimate the carbohydrate content of foods they encounter when eating food they do not prepare themselves.