Lowest-calorie protein powder per 25 g of protein

Calorie counts on a protein powder label describe one scoop, but scoops vary in size and protein content from brand to brand. This page ranks protein powders by calories per 25 grams of protein, so a product with a small, protein-dense serving and one with a large, diluted serving can be compared on the same basis. A lower number generally means less added fat, carbohydrate, or sugar riding along with the protein — but it does not describe taste, mixability, or ingredient quality, and it is not a health recommendation. Products near the top of this list are not automatically the right choice for every diet; check the full nutrition panel on the product page, including sugar and sodium, before deciding. Nutrition figures reflect the most recently reviewed label, not a live feed.