Protein, Carbohydrate and Fat Calculator
Enter energy and check that the percentages total 100%
About the macronutrient calculator
Prepared by: MuscleStationTH Content Team · Content reviewed: 24 August 2026
This tool converts daily energy into grams of protein, carbohydrate and fat using selected percentages. Results are estimates for general nutrition planning, not individualized advice.
What is a Macro Calculator?
A Macro Calculator estimates the three main macronutrients: protein, carbohydrate and fat. Protein and carbohydrate provide approximately 4 kilocalories per gram; fat provides approximately 9.
How to use the calculator
- Estimate daily energy with the BMR and TDEE calculator
- Enter total energy and select macronutrient percentages that add up to 100%
- Calculate and use the results as a starting point for meal planning
- Read the safe fat-loss guide before making substantial changes to energy or proportions
Example macronutrient proportions
These numbers illustrate the tool, rather than recommendations for everyone.
| Example pattern | Carbohydrate / Protein / Fat |
|---|---|
| Higher carbohydrate | 65 / 15 / 20 |
| Balanced | 55 / 15 / 30 |
| Moderate carbohydrate | 50 / 20 / 30 |
Frequently asked questions
What percentages should you choose?
There is no single ratio for everyone. It depends on health, activity, goals and foods you can eat consistently.
Can the results replace advice from a dietitian?
No. This is an educational estimate. People with medical conditions, pregnancy, breastfeeding or dietary restrictions should consult a doctor or dietitian.
References
- FDA: calories per gram — fat 9, carbohydrate 4 and protein 4
- WHO: balanced and varied eating
- NIDDK: Body Weight Planner and adult-use limitations
This tool calculates only macronutrients. It does not assess vitamins, minerals, fibre, food quality or individual health.