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How ProteinDeals Ranks Protein Powder: Our Comparison Method Explained

How ProteinDeals compares UK protein powder using current prices, pack size, servings and label nutrition. There is no hidden composite score: you choose the metric and the table ranks the products.

Bernard, Founder of ProteinDeals

Bernard, Founder of ProteinDeals

Published 27 July 20267 min read
How ProteinDeals Ranks Protein Powder: Our Comparison Method Explained

Quick answer

ProteinDeals does not assign protein powders a hidden star rating or a weighted quality score. The comparison table ranks products directly by measurable fields from current retailer prices and product-label nutrition. For protein powder, the default ranking is lowest price per 25g protein. You can switch to price per serving, price per 100g, total price, protein content, calories or pack size. The selected metric determines the order.

01

What does ProteinDeals actually rank?

Each row represents a real product variant: a particular retailer, flavour, size and purchase option. Products are grouped so that closely related variants stay together, but the table uses the best in-stock variant for the metric you selected.

Lower is better for price and calorie metrics. Higher is better for protein metrics. Missing values are not treated as zero or allowed to win; they are placed after products with usable data.

  1. 1

    Price per 25g protein: the default for protein categories.

  2. 2

    Price per serving: useful when you take a fixed scoop or serving each day.

  3. 3

    Price per 100g: compares the cost of the powder itself, independent of serving guidance.

  4. 4

    Protein per serving and per 100g: compares protein dose and density.

  5. 5

    Calories per serving, per 100g and per 25g protein: useful when calories matter alongside protein.

  6. 6

    Total price and pack size: useful when your immediate spend or storage space matters most.

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02

How price per 25g protein is calculated

The main value calculation is deliberately simple and auditable. We calculate the total grams of protein in the pack, then divide the current price by that amount.

Total protein in pack = pack size in grams × protein per 100g ÷ 100. Price per 25g protein = current pack price × 25 ÷ total protein in pack.

When a reliable price-per-100g value is already available, the equivalent calculation is price per 100g multiplied by 25, divided by protein per 100g. Both routes produce the same unit: pounds per 25g protein.

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03

How the other metrics are calculated

Price per serving is the current pack price divided by servings per pack. Protein per serving comes from the nutrition table where available; otherwise it is calculated from protein per 100g and serving size. Calories use the same label-first approach.

If a retailer does not state servings clearly, the project can derive them from pack size and serving size. Derived values are only used when the required inputs are present and valid.

  1. 1

    Price per serving = pack price ÷ servings per pack.

  2. 2

    Protein per serving = protein per 100g × serving size ÷ 100.

  3. 3

    Calories per 25g protein = calories per 100g × 25 ÷ protein per 100g.

  4. 4

    Price per 100g = pack price ÷ pack size × 100.

Community perspective

What others are saying

There's various “independent” labs that conduct purity testing on various supplements to determine whether the labels are accurate. ON has always done quite well but most brands are way off when it comes to protein content.

u/Inaccurate93 in r/fitmeals

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Hands-on opinions

The Smartest Way To Use Protein To Build Muscle (Science Explained)

Jeff Nippard

A topic-specific video selected for additional practical context on How ProteinDeals Scores Protein Powder: Our Ratings and Testing Method Explained.

04

Where the product data comes from

ProteinDeals collects product variants from the retailer and manufacturer pages represented in the comparison database. The importer stores the product name, retailer, flavour, pack size, stock state, current price, serving information, ingredients and nutrition rows.

Nutrition values are read from the product's published table or label evidence. ProteinDeals prefers an explicit per-100g value. If that is unavailable but protein per serving and serving size are supplied, it can derive protein per 100g. Implausible or incomplete values are excluded from calculations rather than guessed.

Cheapest Whey Protein
Diet Whey Protein Powder

Diet Whey Protein Powder

Pure Source Nutrition · 1kg

381Kcalper 100g
76gProteinper 100g
10.1gCarbsper 100g
2.8gFatper 100g

Pros

  • 55.5% cheaper per 25g protein than the median of 65 other Whey Protein product families in this comparison
£15.99£0.526/25g protein
View dealBuy on Amazon
Compare all whey protein
05

Single-purchase and subscription prices

Single-purchase and subscription prices are kept as separate values. The table defaults to the single-purchase price. Where a genuine subscription price exists, you can switch purchase mode and the price-per-100g, price-per-serving and price-per-protein calculations are recomputed from that subscription price.

Voucher and referral codes may be displayed alongside a product, but an unverified future discount is not silently deducted from the base comparison price. A retailer's live sale price can still be captured when it is the price currently published for that variant.

06

How variants and stock affect the order

A product may have many flavours and sizes. ProteinDeals keeps those variants together and chooses a representative in-stock option for the active sort. If you rank by price per 25g protein, the group's lowest valid in-stock value represents it. If you rank by protein density, the highest valid value represents it.

Out-of-stock variants are hidden by default. If a product has no in-stock variants, its stored variants can still be shown when the out-of-stock control is enabled. Stable tie-breaking keeps the list from jumping unpredictably when two values are equal.

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07

Filters come before ranking

A low price is only useful when the product matches what you want. Category, subcategory, retailer, brand, flavour, pack size, price, protein, calories and stock filters narrow the eligible set before it is ordered.

This is why ProteinDeals does not claim that one powder is universally best. A whey concentrate, vegan blend, mass gainer and clear isolate solve different problems. The table first lets you define the relevant set, then ranks that set using the metric you choose.

08

What is not part of the automatic ranking

Taste, mixability, ingredient preferences, digestive tolerance and certification can matter to a buying decision, but they are not converted into an invented universal score in the comparison table. Those considerations belong in product details, filters and editorial guides where the trade-offs can be explained.

ProteinDeals also does not run its own laboratory assays. Nutrition comes from published product information, and third-party certifications are reported when relevant rather than treated as proof created by ProteinDeals.

09

Does affiliate commission affect the ranking?

No. Affiliate tracking is applied to eligible outbound links after the product and its position have been determined. The sort functions use product fields such as price, size, servings, protein and calories; they do not receive or compare commission rates.

Some retailers may not have an affiliate relationship at all. Their products can still appear and rank on the same measurable values.

10

How to use the comparison

Start by selecting the category and filters that match your needs. For everyday protein value, keep the default price-per-1g-protein order. Use price per serving for products taken in fixed doses, price per 100g when comparing the powder itself, and protein or calorie columns when nutrition matters more than cost.

Finally, open the product details and confirm the exact flavour, size, stock state, delivery terms and checkout total with the retailer before buying. Prices and availability can change after the latest collection.

References

Sources and further reading

  1. 01
    Competition and Markets Authority — price-reduction claims

    UK guidance relevant to reference prices, discount claims and online urgency messaging.

Frequently asked questions

Does ProteinDeals give every protein powder a score?+

No. ProteinDeals does not use a hidden weighted or star score for the comparison table. Products are ordered directly by the metric selected by the user, such as price per 25g protein, price per serving, protein content or calories.

What is the default protein-powder ranking?+

Protein categories default to lowest price per 25g protein. This multiplies the current pack price by 25, then divides by the total grams of protein in the pack, allowing different brands, sizes and protein densities to be compared on the same unit.

Are subscription discounts included?+

Single-purchase and subscription prices are stored separately. The default comparison uses the single-purchase price. When subscription mode is selected for an eligible product, the derived value metrics are calculated from its subscription price.

Does affiliate commission change product positions?+

No. Ranking uses price, nutrition, serving, size and stock data. Affiliate commission is not an input to the sort order, and suppliers without an affiliate relationship can still appear in the comparison.

Does ProteinDeals test products in a laboratory?+

No. ProteinDeals compares current retailer data and published product-label information. Relevant third-party certification can be reported, but ProteinDeals does not claim to perform its own laboratory analysis.

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