Each gram of protein provides about 4 calories.

Quick Scoop: Protein Calories

  • Protein: 4 calories per gram.
  • This is a standard value used on nutrition labels and in tracking apps.
  • So:
    • 10 g protein ≈ 40 calories
    • 25 g protein ≈ 100 calories
    • 100 g protein ≈ 400 calories

If you’re counting macros, you can usually just do: protein grams × 4 = calories from protein.

TL;DR: how many calories per gram of protein = 4 kcal/g.

Information gathered from public forums or data available on the internet and portrayed here.