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Health & Fitness

Macronutrient Calculator

Split daily calories into grams of protein, carbohydrate and fat using a preset or custom percentages.

Your inputs

Results

Protein

150 g/day

Carbohydrate
200 g/day
Fat
67 g/day

≈Estimate based on the stated model and assumptions

Notes for this result

  • Uses Atwater factors (4 / 4 / 9 kcal per gram). Fibre and alcohol are not separated.
Breakdown3 rows
MacronutrientSharekcalGrams
Protein (4 kcal/g)30%600150
Carbohydrate (4 kcal/g)40%800200
Fat (9 kcal/g)30%60066.7

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Macronutrient targets translate a calorie goal into grams of protein, carbohydrate and fat you can track.

Formula and method

Protein g = calories × protein% ÷ 4; Carbohydrate g = calories × carb% ÷ 4; Fat g = calories × fat% ÷ 9

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Daily calories: 2000 kcal
  • Split: Higher protein — 30 / 40 / 30

Results

  • Protein: 150 g/day
  • Carbohydrate: 200 g/day
  • Fat: 67 g/day

How to read the results

Food quality matters as well as the numbers — fibre, micronutrients and whole foods are not captured here.

Assumptions and limitations

  • Uses Atwater energy factors.
  • An estimate for healthy adults, not a diagnosis or medical advice. Consult a qualified health professional about your personal situation.

Health results are general estimates for adults and do not replace medical advice, diagnosis or treatment. Speak to a qualified health professional about your personal situation, especially during pregnancy or if you have a medical condition.

Questions

Is there a best split?

Many splits work; consistency and adequate protein usually matter more than the exact ratio.

Methodology and verification

Result type
Estimate based on the stated model and assumptions
Formula version
1.0
Automated verification
2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy