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About this tool
Turn scoops into grams of protein, check the purity of your whey against the label and compare tubs on cost per 25 g of protein.
A whey scoop protein calculator converts the nutrition panel on your tub into the numbers that actually matter: protein purity as a percentage of the powder, grams of protein per scoop and per tub, and cost per 25 g of protein. Purity is simply protein per scoop divided by scoop weight — a 30 g scoop with 24 g of protein is 80% protein, which is standard WPC80 concentrate, while isolate is specified at around 90%. Comparing tubs on price per kilogram is misleading because scoop sizes and purity differ; price per 25 g of protein is the like-for-like figure.
Open Whey Scoop Protein Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Protein per scoop divided by scoop weight tells you what you are really buying.
Cost per 25 g of protein normalises for scoop size and purity across brands.
Rejects impossible panels, such as protein exceeding the scoop weight or macros that overshoot it.
Usually 20-25 g in a 30 g scoop, which is 67-83% protein by weight. Divide the protein per scoop on the label by the scoop weight to get the real figure — concentrate typically lands at 70-80%, isolate at roughly 90%.
Convert both to cost per gram of protein, not cost per kilogram of powder. Divide the tub price by the total protein in the tub (tub weight times purity). Multiplying that by 25 gives a cost per standard 25 g serving that is directly comparable across brands and scoop sizes.
Isolate is around 90% protein versus 70-80% for concentrate, and has far less lactose, so it is worth it if you are lactose intolerant or counting every gram of carbohydrate. On cost per gram of protein the two are often close; run both through the calculator before deciding.
Yes, if the numbers matter to you. Scoops measure volume, and powder settles or compacts during shipping, so a level scoop can vary by several grams from the stated weight. Weighing on a kitchen scale once tells you how far off your scoop actually is.
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