Cost Per Gram of Protein · 2026
Cheapest Protein Powder Per Gram UK 2026
Price per tub tells you almost nothing. A big cheap tub can cost more per gram of protein than a smaller premium one. We rank every UK protein powder by the metric that actually matters: the true cost of one gram of protein.
Listed-price arithmetic uses recorded protein content and known serving data. Historical scores are unverified and cannot establish formula quality. Delivery and checkout charges are excluded; a listed price is not an approved offer.
Cheapest Per Gram
The lowest cost-per-gram-of-protein picks across whey, isolate and casein.
3.2p
per g protein
Whey
Ranked by cost per gram of protein
3.2p
per g protein
How cost per gram is worked out
Protein per serving is the serving size multiplied by the protein content by weight. Multiply that by the servings in the tub for the total grams of protein, then divide the price by that total. The result is the real price of one gram of protein, the fairest way to compare powders of different sizes and protein percentages. A whey concentrate is usually cheapest per gram; a whey isolate costs a little more but is leaner and lower in lactose.
Informational only — not medical advice. Retailer links carry their own disclosures. This never affects scoring or rankings.