Whey Protein Isolate (WPI)
90.0gprotein / 100g370 cal · 1.0g fat · $$$ · Quality 1.0
Pea Protein Isolate
80.0gprotein / 100g375 cal · 6.0g fat · $$ · Quality 0.82
Whey Protein Isolate (WPI) is in a different weight class here, protein-wise: 90.0g per 100g vs Pea Protein Isolate's 80.0g, a 10.0g difference that's more about food category than food quality.
Whey Protein Isolate (WPI) also carries the stronger amino acid profile (highest DIAAS of any common protein source), while Pea Protein Isolate is DIAAS-adjusted, low in methionine, high in leucine for a plant source.
On price, Pea Protein Isolate wins clearly — $$ against Whey Protein Isolate (WPI)'s $$$.
The dietary-restriction question settles this for a lot of people before the macros even matter: Pea Protein Isolate is vegan, Whey Protein Isolate (WPI) isn't.
Whey Protein Isolate (WPI)'s typical serving also delivers more leucine (2700mg vs Pea Protein Isolate's 2100mg) — relevant if the goal is maximizing the muscle-protein-synthesis trigger per meal, not just total grams.
The real deciding factor is dietary fit, not macros: choose Pea Protein Isolate if you need it to be plant-based, choose Whey Protein Isolate (WPI) otherwise — the protein numbers are close enough that diet compatibility should lead.
Full nutrition comparison
| Per 100g | Whey Protein Isolate (WPI) | Pea Protein Isolate |
|---|---|---|
| Protein | 90.0g | 80.0g |
| Calories | 370 | 375 |
| Fat | 1.0g | 6.0g |
| Carbs | 1.5g | 5.0g |
| Fiber | 0.0g | 4.0g |
| Quality score | 1.0 | 0.82 |
| Relative cost | $$$ | $$ |
| Prep time | 1 min | 1 min |
Frequently asked
Which has more protein, whey protein isolate (wpi) or pea protein isolate?
Whey Protein Isolate (WPI) has 90.0g of protein per 100g compared to Pea Protein Isolate's 80.0g.
Which is lower in calories?
Whey Protein Isolate (WPI) is lower in calories per 100g, at 370 vs the other's 375.