Protein Per Meal Calculator Formula

Understand the math behind the protein per meal calculator. Each variable explained with a worked example.

Use the Protein Per Meal Calculator

Formulas Used

Protein

protein_g = food_weight_g * protein_pct / 100

Calories from Protein

calories_from_protein = (food_weight_g * protein_pct / 100) * 4

% of 50 g Daily Target

pct_daily_50g = (food_weight_g * protein_pct / 100) / 50 * 100

Variables

VariableDescriptionDefault
food_weight_gFood Weight(g)150
protein_pctProtein Content25

How It Works

How to Calculate Protein Per Meal

Formula

Protein (g) = Food Weight (g) x Protein Percentage / 100

Protein Content of Common Foods (cooked)

  • Chicken breast: 31 g per 100 g
  • Lean beef: 26 g per 100 g
  • Salmon: 22 g per 100 g
  • Eggs: 13 g per 100 g (about 6 g per large egg)
  • Tofu: 9 g per 100 g
  • Lentils: 9 g per 100 g cooked

    • Worked Example

    Calculate protein in 150 g of cooked chicken breast.

    food_weight_g = 150protein_pct = 31
    1. 01Chicken breast protein: 31 g per 100 g.
    2. 02Protein: 150 x 31/100 = 46.5 g.
    3. 03Calories from protein: 46.5 x 4 = 186 kcal.

    Frequently Asked Questions

    How much protein do I need per day?

    The RDA is 0.8 g per kg of body weight. Active individuals and athletes may need 1.2-2.0 g per kg. A 70 kg person needs 56-140 g per day.

    Does cooking change protein content?

    Cooking does not destroy protein, but it does cause water loss, concentrating protein per gram of cooked food. Always use cooked values when measuring cooked food.

    Are plant proteins as good as animal proteins?

    Most plant proteins are incomplete (lacking some essential amino acids). Combining different plant sources (like beans and rice) provides a complete amino acid profile.

    Ready to run the numbers?

    Open Protein Per Meal Calculator