Two protein powders cost $40. Both tubs contain 20 servings. That looks like a tie—until you notice that one serving supplies 25g of protein and the other supplies 20g.
To compare value, work out the cost of the same amount of protein in each tub. Keep the cost per serving too: that tells you what your usual shake will cost. Together, those figures make it easier to judge a larger pack or a tempting subscription offer.
Price ÷ (servings in the tub × protein grams per serving) × 25 = cost per 25g of protein.
We use 25g as a convenient measuring stick. It is not an instruction about how much protein you should take.
Start with three numbers
- The price you will pay. Start with the one-time price. Add delivery and tax if you want the full delivered comparison.
- The number of servings in that exact container. Check the flavor and size; do not borrow the count from a different tub.
- Protein grams per serving. Read the nutrition panel. The weight of the powder is a different number.
For example, a 35g scoop of powder might contain 25g of protein. Use 25 in the calculation. The remaining powder contributes other ingredients and nutrients; it is not automatically wasted space, but it is not additional protein either.
A cheaper scoop can cost more for the same protein
Now suppose one tub has a lower sticker price. These two hypothetical powders show why the cheaper scoop can still be the more expensive source of protein.
| Powder A | Powder B | |
|---|---|---|
| Price | $40 | $36 |
| Servings | 20 | 20 |
| Protein per serving | 25g | 20g |
| Cost per serving | $2.00 | $1.80 |
| Total protein in tub | 500g | 400g |
| Cost per 25g protein | $2.00 | $2.25 |
If both powders meet your needs and you are shopping for protein per dollar, Powder A wins this comparison. Powder B saves 20 cents per labeled serving, but supplies less protein in that serving. It could still suit someone who wants that smaller contribution to a meal; the lower scoop price alone does not make it better value.
For Powder B, the arithmetic is $36 ÷ (20 × 20) × 25 = $2.25. You are comparing equivalent quantities on paper, not being told to change the manufacturer’s preparation instructions.
Include delivery before calling something a bargain
Suppose Powder A costs another $8 to deliver. Its total becomes $48, and its cost per 25g rises to $2.40. If Powder B’s $36 price includes delivery, it now offers the lower delivered cost per 25g.
That delivery charge changes which powder costs less for the same protein. Check both checkout totals before deciding. And if free shipping requires extra items, ask whether you wanted those items in the first place.
Keep subscription offers in a separate comparison
A first-order discount can make a product look much cheaper than its ongoing cost. Write down three figures: the one-time price, the introductory subscription price and the renewal price. Then compare like with like.
For an invented $50 tub with 25 servings of 25g protein, the ordinary price is $2 per 25g. A 20% introductory discount brings it to $1.60; a later 10% discount makes it $1.80. The lowest number describes one order, not every future purchase.
A subscription may suit a product you already know you will use. For a new flavor, a smaller one-time purchase can be worth the higher unit cost because it limits how much you commit before trying it.
Use price after checking suitability
Build a shortlist that meets your dietary needs before sorting it by cost. For gluten-free shoppers, that means checking the exact label and the scope of any certification. Milk, peanuts, sesame and other allergens need their own checks too. Our supplement label guide explains how to do this.
The calculation measures the price of the labeled protein quantity. It does not prove that two powders have identical amino-acid profiles, testing standards, taste or suitability for you. A higher price may buy something you value, but the price itself does not demonstrate better recovery.
Your quick shopping checklist
- Same country version, flavor and pack size as the label you checked?
- Protein grams, rather than scoop weight, used in the formula?
- Delivery and discounts treated consistently?
- Subscription renewal price checked?
- A quantity and flavor you expect to use?
Save the cost per serving and cost per 25g beside the exact product name. When the price changes or a larger tub goes on sale, you can update the calculation without starting your shortlist again.
For actual product examples, see our protein-powder buying guide.
About these examples
All prices and products in the worked examples are hypothetical, not current offers. Arithmetic checked October 7, 2026. This guide explains shopping comparisons and does not prescribe an individual protein target. See our editorial methodology.