Whey Protein Price Per Gram Explained

You see two whey products: $35 for 2lbs and $75 for 5lbs. Which is cheaper? Seems simple, but there's missing information. That $35 tub might have 70% protein, while the $75 bag has 82%.

Why price per pound is misleading

Say you buy whey A for $15.90 per pound (454g) with 70% protein. You're paying $15.90 for 318g of protein. That's $0.050 per gram of protein.

Whey B costs $20 per pound but has 90% protein (isolate). You're paying $20 for 409g of protein. That's $0.049 per gram of protein.

The more expensive product can actually be cheaper. And you won't see that from the pound price alone.

The formula

Price per gram protein = (price ÷ weight in grams) ÷ (protein percentage ÷ 100)

Convert pounds to grams first (1 lb = 454g), then divide by protein percentage.

A product at $30/2lbs (908g) with 80% protein: (30 ÷ 908) × 100 ÷ 80 = $0.041 per gram protein.

Concentrate vs isolate: what's actually cheaper?

The cheapest products are almost always concentrates (70-80% protein). Isolates run 85-92% protein but cost more per pound. Does the higher protein content compensate for the higher price?

Usually: no. Concentrates win on price per gram. But the gap is often small. If you're lactose intolerant or cutting calories hard, isolate might be worth the premium.

Tip: bigger bags aren't always cheaper

Common mistake. A 10lb bag looks better value, but always check price per gram protein. Some brands barely increase the per-pound price for smaller sizes.

Practical tip

Calculate before you buy. Don't trust the "best value" labels on the front of the package. Marketing teams know most people won't do the math.

Sources

Jäger R. et al. "International Society of Sports Nutrition Position Stand: protein and exercise." J Int Soc Sports Nutr. 2017. PubMed