Cheapest whey protein, ranked by price per kg of protein
Whey isolate, concentrate and blends from every store we track, cheapest real protein first. Prices updated 7 Nov 2026
Australia: Bulk Nutrients Thermowhey Weight Loss Protein at Bulk Nutrients: A$76 per kg of protein (A$62.00 for 1 kg, 82% protein).
United Kingdom: XL Nutrition XTRA Whey 2kg at Discount Supplements: £29 per kg of protein (£39.99 for 2 kg, 70% protein).
| # | Product | A$ per kg of protein | Price | Protein | Link |
|---|---|---|---|---|---|
| 1 | Bulk NutrientsThermowhey Weight Loss Protein | A$76A$2.28 per 30 g protein | A$62.001 kg | 82%label | View Bulk Nutrients Thermowhey Weight Loss Protein at Bulk Nutrients |
| 2 | Bulk NutrientsWhey Protein Concentrate | A$82A$2.46 per 30 g protein | A$59.001 kg | 72%label | View Bulk Nutrients Whey Protein Concentrate at Bulk Nutrients |
| 3 | Bulk NutrientsNatural Australian Whey Protein Concentrate | A$85A$2.55 per 30 g protein | A$61.001 kg | 72%label | View Bulk Nutrients Natural Australian Whey Protein Concentrate at Bulk Nutrients |
| 4 | Bulk NutrientsWhey Protein Isolate | A$95A$2.86 per 30 g protein | A$79.001 kg | 83%label | View Bulk Nutrients Whey Protein Isolate at Bulk Nutrients |
| 5 | Bulk NutrientsHASTA Whey Protein Isolate | A$96A$2.89 per 30 g protein | A$82.001 kg | 85%label | View Bulk Nutrients HASTA Whey Protein Isolate at Bulk Nutrients |
| 6 | Bulk NutrientsNatural Whey Protein Isolate | A$99A$2.96 per 30 g protein | A$80.001 kg | 81%label | View Bulk Nutrients Natural Whey Protein Isolate at Bulk Nutrients |
| 7 | Musashi100% Whey Protein Powder | A$107A$3.20 per 30 g protein | A$154.992 kg | 73%label | View Musashi 100% Whey Protein Powder at Musashi |
| 8 | Genetix NutritionPure Whey | A$109A$3.28 per 30 g protein | A$69.95900 g | 71%label | View Genetix Nutrition Pure Whey at Nutrition Warehouse |
| 9 | Happy WayMen's Premium Whey Protein | A$117A$3.50 per 30 g protein | A$86.951 kg | 75%label | View Happy Way Men's Premium Whey Protein at Nutrition Warehouse |
| 10 | BSc SupplementsWhey Protein Powder | A$117A$3.50 per 30 g protein | A$60.00720 g | 71%label | View BSc Supplements Whey Protein Powder at Nutrition Warehouse |
| 11 | Bare BlendsBare Whey Protein Isolate | A$146A$4.38 per 30 g protein | A$94.99750 g | 87%label | View Bare Blends Bare Whey Protein Isolate at Bare Blends |
| 12 | Pillar PerformanceGrass Fed WPI | A$169A$5.06 per 30 g protein | A$134.951 kg | 80%label | View Pillar Performance Grass Fed WPI at Nutrition Warehouse |
| 13 | MusashiWhey Protein Isolate - WPI | A$190A$5.69 per 30 g protein | A$133.49900 g | 78%label | View Musashi Whey Protein Isolate - WPI at Musashi |
Prices checked 7 Nov 2026 (daily), cheapest flavour and best-value size in stock, before shipping and discount codes. Protein % is from each label. How we calculate.
No United States products match this list yet. We add merchants every week.
| # | Product | £ per kg of protein | Price | Protein | Link |
|---|---|---|---|---|---|
| 1 | XL NutritionXTRA Whey 2kg | £29£0.86 per 30 g protein | £39.992 kg | 70%label | View XL Nutrition XTRA Whey 2kg at Discount Supplements |
| 2 | XL NutritionXTRA Whey 2kg | £29£0.86 per 30 g protein | £39.992 kg | 70%label | View XL Nutrition XTRA Whey 2kg at Discount Supplements |
| 3 | EFECTIV NutritionGrass Fed Whey Protein Isolate - 66 Servings - EFECTIV® | £36£1.08 per 30 g protein | £64.992 kg | 90%label | View EFECTIV Nutrition Grass Fed Whey Protein Isolate - 66 Servings - EFECTIV® at EFECTIV Nutrition |
| 4 | Applied Nutrition LtdDiet Whey Protein | £38£1.14 per 30 g protein | £54.951.8 kg | 80%label | View Applied Nutrition Ltd Diet Whey Protein at Applied Nutrition plc |
| 5 | EFECTIV NutritionEFECTIV® Clear Whey Protein Isolate | £62£1.87 per 30 g protein | £29.99600 g | 80%label | View EFECTIV Nutrition EFECTIV® Clear Whey Protein Isolate at EFECTIV Nutrition |
| 6 | Supplement NeedsVegan Iso+ - 1kg | £66£1.99 per 30 g protein | £39.991 kg | 60%label | View Supplement Needs Vegan Iso+ - 1kg at Supplement Needs |
Prices checked 7 Nov 2026 (daily), cheapest flavour and best-value size in stock, before shipping and discount codes. Protein % is from each label. How we calculate.
What "cheap" whey looks like in each country
| Country | Median whey isolate | Median concentrate / blend |
|---|---|---|
| Australia | A$122 per kg protein (6 products) | A$107 per kg protein (7 products) |
| United States | — | — |
| United Kingdom | £62 per kg protein (3 products) | £29 per kg protein (3 products) |
Anything well under the median is a genuinely good price. Shipping is not included, so a slightly dearer store with free shipping can win on a small order.
How to pay less for whey
- Buy the bigger bag. 2–5 kg packs are usually 10–30% cheaper per kg than 1 kg packs. Our table already picks the best-value size in stock.
- Unflavoured is often cheapest and works in smoothies, oats and baking. See unflavoured protein powder.
- Concentrate vs isolate: concentrate is usually cheaper per kg of powder, but isolate has more protein per scoop, so the gap per kg of protein is smaller than it looks. Compare them.
- Watch the "diet" and "women's" premium. These products often cost more per kg of protein than standard whey. See the numbers.
FAQ
What is the cheapest whey protein?
It changes with sales, which is why we re-check prices every day. The table above always shows the current cheapest per kg of protein in each country.
Is cheap whey protein worse?
Not necessarily. Price mostly reflects brand, marketing, packaging and flavour systems. What you can compare objectively is the protein per 100 g on the label, which we use for the ranking. We do not lab-test products (yet), so we rely on the label.
Why rank by price per kg of protein instead of price per kg?
Because powders differ a lot in protein content. A 1 kg bag at 90% protein contains 900 g of protein; a 1 kg bag at 65% contains 650 g. Price per kg of protein shows what you actually pay for the protein.
Related guides
- Cheapest whey protein isolate (WPI)
WPI and clear whey, cheapest real protein first.
- Whey isolate vs concentrate: is WPI worth the extra?
Label protein %, price per kg of protein, and who each suits.
- Best value protein powder
Value = price per gram of protein. The full ranking, updated daily.
- Protein cost per gram calculator
Work out price per kg of protein for any tub in 10 seconds.
- Cheapest vegan & plant protein powder
Pea, rice, soy and blends ranked by price per kg of protein.
- Cheapest casein protein
Micellar casein ranked by price per kg of protein.
General information only, not medical or dietary advice. Check the label for allergens and talk to a doctor or dietitian if you are pregnant, have a medical condition or take medication.