Protein Purity Analyzer
Check the purity of any protein powder by calculating calories per 100g protein. Compare against our database to see how it ranks.
What is Protein Purity?
Protein purity is measured by calories per 100g of protein. Pure protein has exactly 400 calories per 100g. Higher ratios indicate more fillers like sweeteners, thickeners, and added ingredients.
Pure protein contains 4 calories per gram. Therefore, 100g of pure protein equals exactly 400 calories. When a product has more calories per 100g protein, it means there are extra calories from carbohydrates, fats, or fillers in the formula.
Calculate Your Product's Purity
How to Interpret Your Results
Lower is better. 400-420 is excellent purity (whey isolate, pure protein). 430-450 is good (most quality whey). 460-500 is average (mass gainers have more). Over 500 means significant fillers.
The calories per 100g protein ratio tells you how "pure" a protein powder is:
- 400-420 kcal/100g: Excellent purity. Usually whey isolate or very clean formulas.
- 430-450 kcal/100g: Good purity. Most quality whey concentrates fall here.
- 460-500 kcal/100g: Average. May have some flavorings or minor additives.
- 500+ kcal/100g: Lower purity. Likely contains significant carbs, fats, or fillers.
Why Purity Matters
Higher purity means you're getting more protein per scoop and fewer extra calories. This is especially important if you're tracking calories or trying to build lean muscle. However, some added ingredients (like digestive enzymes or probiotics) can increase the ratio while providing benefits.