Calorie estimates use the standard 4-4-9 rule: protein and carbs are counted at 4 calories per gram, and fat is counted at 9 calories per gram. You can compare foods either by their standard serving or by an equal 100 g basis, and the stacked view keeps those values aligned for faster scanning across the whole list. The Protein Absorption column uses approximate DIAAS reference values to compare protein quality, not just protein quantity. Use the Metric control to compare calories needed to reach either 20 grams of protein or 10 grams of dietary fiber; Fiber mode excludes foods with less than 0.5 grams of fiber per 100 grams. Values are approximate reference amounts and are best used for quick comparisons rather than precise nutrition tracking.