Daily Meal Calories Calculator Formula

Understand the math behind the daily meal calories calculator. Each variable explained with a worked example.

Use the Daily Meal Calories Calculator

Formulas Used

Calories per Meal

calories_per_meal = round(daily_calories * (1 - snack_pct / 100) / num_meals)

Calories per Snack

calories_per_snack = num_snacks > 0 ? round(daily_calories * snack_pct / 100 / num_snacks) : 0

Protein per Meal (est.)

protein_per_meal = round(daily_calories * (1 - snack_pct / 100) / num_meals * 0.075)

Total Daily (verification)

total_check = daily_calories

Variables

VariableDescriptionDefault
daily_caloriesDaily Calorie Target(cal)2000
num_mealsNumber of Main Meals3
num_snacksNumber of Snacks2
snack_pctSnack Calories (% of total)(%)20
snack_totalDerived value= daily_calories * snack_pct / 100calculated
meal_totalDerived value= daily_calories * (1 - snack_pct / 100)calculated

How It Works

How to Distribute Daily Calories

Formula

Snack Calories = Daily Target x Snack %

Meal Calories = (Daily Target - Snack Calories) / Number of Meals

Common Distributions

  • 3 meals, no snacks: Breakfast 25%, Lunch 35%, Dinner 40%
  • 3 meals, 2 snacks: Meals 80%, Snacks 20%
  • 5-6 small meals: Equal portions throughout the day

    • Protein Target

    A general estimate is 30% of calories from protein, or about 0.075 g protein per calorie per meal. Active individuals may need more. This calculator provides a rough protein guideline.

    Worked Example

    2000 daily calories, 3 meals and 2 snacks, snacks = 20%.

    daily_calories = 2000num_meals = 3num_snacks = 2snack_pct = 20
    1. 01Snack total = 2000 x 0.20 = 400 cal
    2. 02Meal total = 2000 - 400 = 1600 cal
    3. 03Per meal = 1600 / 3 = 533 cal
    4. 04Per snack = 400 / 2 = 200 cal
    5. 05Protein per meal (est.) = 533 x 0.075 = 40 g

    Ready to run the numbers?

    Open Daily Meal Calories Calculator