Whey Protein Price Comparison: Price Per Gram of Protein 2026

The price on the bag means little. A 2kg bag for £50 can be cheaper than one for £35 — if it has more protein. The only fair metric: price per gram of protein.

We've calculated 15 popular whey proteins.

The formula

Price per gram = Total price ÷ (Servings × Protein per serving)

Example: £60 for 100 servings of 25g protein = £60 ÷ 2500g = £0.024 per gram.

The cheapest options 2026

Here's the top 5 by price per gram protein (as of March 2026):

Bulk Pure Whey Protein (2.5kg): £0.027/g — £51.83 for 2500g with 23g protein per serving
XXL Nutrition Perfect Whey (2kg): £0.032/g — £49.99 with solid 24g per serving
Myprotein Impact Whey (2.5kg): £0.032/g — £61.49, but often 40% off (then £0.019/g!)
ESN Designer Whey (2kg): £0.040/g — Premium quality, Made in Germany
Zumub 100% Whey Isolate (1kg): £0.035/g — Isolate at concentrate price

The expensive surprises

Some well-known brands cost significantly more:

Optimum Nutrition Gold Standard: ~£0.048/g
Dymatize ISO100: ~£0.050/g
Scitec 100% Whey Professional: ~£0.036/g

Is that marketing or quality? The amino acid profiles differ minimally. The main difference is taste and brand perception.

Concentrate vs isolate — the real difference

Isolate has more protein per 100g (90% vs 80%), but often costs 30-50% more. Do the maths:

If isolate costs 40% more but only has 12% more protein → concentrate wins
If you're lactose intolerant → isolate might still make sense

Watch for sales

Myprotein and Bulk regularly have 40-50% off sales. During these promotions, expensive products can suddenly become the cheapest.

Tip: Subscribe to newsletters and wait for Black Friday, Singles Day or Easter.

What else to consider

Serving size: Some brands list 25g of powder, others 30g. Always compare the protein, not the powder.
Additives: Cheap products often have more fillers. Check the ingredients list.
Shipping: Free above £45? Then bulk buying pays off.

Conclusion

For the best price per gram: Bulk, XXL or Myprotein during sales. For German quality without compromise: ESN.

Compare all products live at whey-wijzer.fit — prices are updated daily.