Cheapest whey in the range
Protein Works
Whey Protein 360 Black
2.4kg bag
Buy Whey Protein 360 Black →Direct from Protein WorksGet 12% off your order
Back to Blogor buy on Amazon → 
or buy on Amazon →
Buying Guide
Protein Works Compare UK 2026: Every Range, Tier and Price
Protein Works sells whey in three tiers: Black for value, Gold as the standard formulation and Platinum as the most complete, with the most added vitamins and minerals. The tiers change the protein, sugar and price: Whey Protein 360 Black has 59g of protein per 100g against 67g to 68g for Gold and Platinum.
KE
Kevin, founder of WheyWise
20 September 2026Updated 20 October 20268 min read
Cheapest vegan protein in the range
Protein Works
Vegan Soy Protein Black
1kg bag
Buy Vegan Soy Protein Black →Direct from Protein WorksGet 12% off your order
Quick answer
The cheapest Protein Works whey is Protein Works Whey Protein 360 Black, at 65p per 25g of protein in the 4.8kg bag. Black, Gold and Platinum are not just labels: on whey, Protein Works Whey Protein 360 Black contains 59g of protein per 100g against 67g to 68g for Gold and Platinum, and more sugar per serving. If you are vegan, Protein Works Vegan Soy Protein Black is cheaper still, at 36p per 25g of protein in the 4kg bag. WheyWise checked every price and nutrition label in this guide on theproteinworks.com.
For the wider brand line-up, see UK protein brands worth buying.
What do Black, Gold and Platinum mean at Protein Works?
Black, Gold and Platinum are Protein Works' three formulation tiers. Black is the value version, built around taste, price and value. Gold is the standard formulation. Platinum is the most complete formulation, with the most added vitamins, minerals and extras and a focus on taste and nutrition. The tiers are not just names: on whey they change the protein content, the sugar and the price.
The fair way to compare them is cost per 25g of protein, because that survives different bag sizes and protein contents. Every figure in this guide is cost per 25g of protein, worked out from the one-off price and the nutrition label on theproteinworks.com (Chocolate Silk unless stated).
| Whey Protein 360 tier | Protein per 100g | Serving | Cost per 25g of protein (4.8kg) |
|---|---|---|---|
| Black | 59g | 18g protein in 30g | 65p |
| Gold | 67g to 68g | 20g protein in 30g | about 84p |
| Platinum | 67g | 24g protein in 35g | 96p |
Which Protein Works protein is cheapest per gram?
The cheapest whey is Protein Works Whey Protein 360 Black at 65p per 25g of protein in the 4.8kg bag at £73.49. Here is the dairy ladder, largest bag of each product; the vegan range has its own table below.
| Product | Protein per 100g | Bag and price | Cost per 25g of protein |
|---|---|---|---|
| Protein Works Whey Protein 360 Black | 59g | 4.8kg, £73.49 | 65p |
| Protein Works 100% Micellar Casein Black | 78g | 4kg, £104.99 | 84p |
| Protein Works Whey Protein 360 Gold | 67g to 68g | 4.8kg, £108.99 | about 84p |
| Protein Works Whey Protein 360 Platinum | 67g | 4.8kg, £122.99 | 96p |
| Protein Works Clear Diet Whey Protein Gold | 82g | 500g, £23.99 | £1.46 |
| Protein Works Clear Protein 360 Gold | 82g | 720g, £40.99 | £1.74 |
One-off prices and nutrition labels on theproteinworks.com, Chocolate Silk where sold (Whey Protein 360 Gold price read on Banana Smooth; Clear Vegan on Apple & Lemon Twist). Premium flavours can cost more.
Protein Works Whey Protein 360 Black is 23% cheaper per gram of protein than Protein Works Whey Protein 360 Gold, but it contains less protein per 100g (59g against 67g to 68g) and more sugar, 6.7g to 7.6g per 30g serving against 4.1g to 4.8g for Gold.
Cheapest whey in the range
Protein Works Whey Protein 360 Black
2.4kg bag
The value pick of the Protein Works whey range, as long as you accept a lower protein content per scoop.
or compare all UK prices →Cheapest whey in the range
Protein Works Whey Protein 360 Black
2.4kg bagPros
- + Costs 65p per 25g of protein in the 4.8kg bag
- + 23% cheaper per gram of protein than Whey Protein 360 Gold
- + Code WW12 took 12% off in our basket test on 22 September 2026
Cons
- – Contains 59g of protein per 100g, less than Gold and Platinum
- – More sugar than Gold: 6.7g to 7.6g per 30g serving
●Nutrition per scoop · 17.7g protein in 30g▼
Protein makes up 59%
of this 30g scoop · 109 kcal total
17.7g
7.5g
Protein17.7g
Carbs7.5g
Fat1g
Other3.8g
The vegan range is cheaper per gram of protein than any Protein Works whey, because plant isolates carry more protein per 100g. Protein Works Vegan Soy Protein Black is the cheapest protein the brand sells, at 36p per 25g of protein in the 4kg bag at £47.99, with 84g of protein per 100g. It is a single-source soy protein rather than a blend.
| Vegan product | Protein per 100g | Bag and price | Cost per 25g of protein |
|---|---|---|---|
| Protein Works Vegan Soy Protein Black | 84g | 4kg, £47.99 | 36p |
| Protein Works Vegan Protein 360 Black | 79g | 4kg, £60.99 | 48p |
| Protein Works Vegan Protein 360 Gold | 82g | 4kg, £67.99 | 52p |
| Protein Works Vegan Protein 360 Platinum | 83g | 4kg, £82.49 | 62p |
| Protein Works Clear Vegan Protein Gold | 67g | 540g, £33.99 | £2.35 |
Cheapest vegan protein in the catalogue
Protein Works Vegan Soy Protein Black
1kg bag
Nothing else Protein Works sells comes close on cost per gram of protein. A plain product that wins on the arithmetic.
or compare all UK prices →Cheapest vegan protein in the catalogue
Pros
- + Costs 36p per 25g of protein in the 4kg bag
- + Contains 84g of protein per 100g, the highest density Protein Works sells
- + Single-source soy, so a short ingredient list
Cons
- – Single protein source rather than a blend
- – The label shows 25g of protein per 30g serving, below the 27g the page headline claims
●Nutrition per scoop · 25.2g protein in 30g▼
Protein makes up 84%
of this 30g scoop · 110 kcal total
25.2g
Protein25.2g
Carbs1.5g
Fat0.4g
Other2.9g
Is Protein Works Gold or Platinum worth paying for?
On whey, Gold is worth it if you want more protein per scoop, and Platinum is worth it for the formulation rather than the protein. Protein Works Whey Protein 360 Gold contains 67g to 68g of protein per 100g at about 84p per 25g of protein. Protein Works Whey Protein 360 Platinum contains 67g of protein per 100g at 96p per 25g of protein, both in the 4.8kg bag. So Platinum does not add protein over Gold: it adds the extra vitamins, minerals and actives and a bigger 35g serving with 24g of protein.
On the vegan range, Protein Works Vegan Protein 360 Platinum costs 62p per 25g of protein against 52p for Protein Works Vegan Protein 360 Gold, a 20% premium. The protein is almost identical, at 83g against 82g per 100g, so again you are paying for formulation. For a closer look at the whey tiers, see our Protein Works Whey Protein 360 Gold vs Platinum review.
Most complete vegan formula
Protein Works Vegan Protein 360 Platinum
1kg bag
Buy this for the formulation and flavours rather than the protein, which matches the cheaper Gold version.
or compare all UK prices →Most complete vegan formula
Pros
- + Contains 83g of protein per 100g, 29g in each 35g serving
- + Costs 62p per 25g of protein in the 4kg bag
- + The most complete formulation in the vegan range
Cons
- – 20% dearer per gram of protein than Vegan Protein 360 Gold
- – No real protein advantage over the Gold tier
●Nutrition per scoop · 29.1g protein in 35g▼
Protein makes up 83%
of this 35g scoop · 133 kcal total
29.1g
Protein29.1g
Carbs2.1g
Fat0.9g
Other2.9g
Is Protein Works cheaper than Bulk?
On OnTap subscription, yes. Protein Works Whey Protein 360 Black costs 60p per 25g of protein in the 4.8kg bag at £68.49 on OnTap. Bulk Basic Whey Protein costs 64p per 25g of protein in the 2.5kg bag at £35.99 on Amazon UK. That makes Whey 360 Black about 6% cheaper per gram of protein, with more protein per 100g: 59g against 56g for Basic Whey, which is a whey and soya blend.
| Product | Protein per 100g | Bag and price | Cost per 25g of protein |
|---|---|---|---|
| Protein Works Vegan Soy Protein Black | 84g | 4kg, £47.99 | 36p |
| Bulk Basic Whey Protein (whey and soya) | 56g | 2.5kg, £35.99 (Amazon UK) | 64p |
| Protein Works Whey Protein 360 Black | 59g | 4.8kg, £68.49 (OnTap) | 60p |
The Protein Works code WW12 took 12% off Whey Protein 360 Black in our basket test on 22 September 2026, which more than closes that gap if you use it. And if you do not need whey, Protein Works Vegan Soy Protein Black at 36p per 25g of protein is cheaper than either. You can check both brands against the rest of the market on our whey concentrate comparison or run them side by side in the protein comparison tool.
Which Protein Works product should you buy?
Buy Protein Works Whey Protein 360 Black for the lowest whey price, at 65p per 25g of protein, or Protein Works Whey Protein 360 Gold for more protein and less sugar per scoop, at about 84p. Buy the Platinum tiers for the extra formulation, not for extra protein.
If you are vegan, buy Protein Works Vegan Soy Protein Black: it costs 36p per 25g of protein and contains 84g of protein per 100g, the best combination of price and density in the range. For meal shakes, see our best meal replacement shake UK guide and Protein Works vs Huel, and for how Protein Works compares with Myprotein, read our Protein Works vs Myprotein price comparison.
How these figures are worked out. Every number here is cost per 25g of protein: the one-off price divided by the grams of protein in the bag, then scaled to 25g. That is the only fair way to compare a 4.8kg whey against a 540g clear vegan protein. All prices and nutrition labels were read on theproteinworks.com, except Bulk Basic Whey Protein, read on bulk.com. The product cards read our Protein Works feed, which currently carries the OnTap subscription price for products that offer one, so a card can show up to 15% less than the one-off price quoted in the text.
Frequently asked questions
What is the difference between Protein Works Black, Gold and Platinum?
Black is the value version, Gold is the standard formulation and Platinum is the most complete formulation with the most added extras. On whey the tiers really do differ: Protein Works Whey Protein 360 Black contains 59g of protein per 100g, while Protein Works Whey Protein 360 Gold contains 67g to 68g and Protein Works Whey Protein 360 Platinum contains 67g. Black also carries more sugar per serving than Gold.
What does the 360 in Protein Works 360 mean?
360 is the family name Protein Works gives its blended formulas: Whey Protein 360, Vegan Protein 360, Clear Protein 360, Complete Meal 360 and the Diet Meal 360 line. Most are sold in more than one of the Black, Gold and Platinum tiers. The number signals a blend rather than a single protein source.
What is the cheapest Protein Works product per gram of protein?
Protein Works Vegan Soy Protein Black, at 36p per 25g of protein in the 4kg bag, with 84g of protein per 100g. If you want whey specifically, the cheapest is Protein Works Whey Protein 360 Black at 65p per 25g of protein in the 4.8kg bag.
Is Protein Works cheaper than Bulk?
On OnTap subscription, yes. Protein Works Whey Protein 360 Black costs 60p per 25g of protein in the 4.8kg bag at £68.49 on OnTap, against 64p for Bulk Basic Whey Protein in the 2.5kg bag on Amazon UK, and it has more protein: 59g per 100g against 56g for Basic Whey, a whey and soya blend. Protein Works Vegan Soy Protein Black is cheaper than either at 36p per 25g of protein.
Does Protein Works sell a Whey Protein 360 Platinum?
Yes. Protein Works Whey Protein 360 Platinum contains 67g of protein per 100g, which is 24g of protein in each 35g serving, and costs 96p per 25g of protein in the 4.8kg bag at £122.99.
Related reading
Buying Guide
What Are the Best Protein Bars in the UK? (2026)
Myprotein, Protein Works and Bulk protein bars ranked on protein per calorie, sugar, sweeteners, palm oil and cost per 10g of protein, with Layered vs Impact, the best vegan bar and the best bar for weight loss. Prices and labels checked at source.
10 min readBuying Guide
How to Read a Protein Bar Label: Protein, Sugar and Polyols
To read a protein bar label, check protein per calorie, sugar per 100g, the polyols line, fibre and the bar's weight. A bar can only say high protein if 20% of its energy comes from protein. This guide shows how to work each figure out from the panel, with examples from Myprotein, Protein Works and Bulk.
6 min readBuying Guide
Protein Bar or Protein Shake: Which Is Better Value?
A whey shake is the cheaper way to buy protein, at about 24p per 10g on Protein Works' OnTap price, against about 92p per 10g for a Myprotein bar. Bars win on convenience and need no shaker. Here is the cost, the calories and when each one makes sense.
6 min readFind your cheapest protein
789 products compared from 182 brands
Sorted by best value per 25g of protein.
Compare all products