In any food label there is carb section, with total carb, fiber and sugar. Sometimes alcohol sugar.
Convention wisdom is carb are separated into fiber, sugar (fructose and glucose) and starch. So from a label total carb less fiber, less sugar, whatever remaining must be starch.
Sadly there is scant info about this. Let's look at broccoli, 1 cup. 6.0g carb, 2.4g fiber and 1.6g sugar. So 1g starch? Isn't broccoli non-starchy?
So what is the answer?