Macro Meal Builder Calculator accuracy and testing

Formula source

• Protein and carbs use 4 calories per gram. Fat uses 9 calories per gram. Percentages are based on calories, not grams.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• All prices, rates, package sizes, and recipe values are user-entered unless clearly labeled as a general planning default.
• Calculations run locally in your browser and do not store food, nutrition, household, or budget details.
• This is planning math, not nutrition, medical, allergen, or food-safety advice.

Unit handling

• Protein accepts values in g.
• Carbs accepts values in g.
• Fat accepts values in g.
• Servings accepts numeric values.
• Calories per Serving is displayed in cal.
• Total Calories is displayed in cal.
• Protein Calories is displayed as a percentage.
• Carb Calories is displayed as a percentage.
• Fat Calories is displayed as a percentage.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Percent outputs are displayed with two decimal places.
• Input precision follows configured step values where provided.

Version history

Change log